Grizzly T32720 User guide

MODEL T32720

10" VARIABLE-SPEED

WET SHARPENER

OWNER'S MANUAL

(For models manufactured since 06/21)

COPYRIGHT © AUGUST, 2021 BY GRIZZLY INDUSTRIAL, INC., REVISED FEBRUARY, 2023 (BL)

WARNING : NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE

OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.

#CS21901 PRINTED IN CHINA

V1.0 2.23

This manual provides critical safety instructions on the proper setup,
operation, maintenance, and service of this machine/tool. Save this
document, refer to it often, and use it to instruct other operators.

Failure to read, understand and follow the instructions in this manual
may result in fire or serious personal injury—including amputation,
electrocution, or death.

The owner of this machine/tool is solely responsible for its safe use.
This responsibility includes but is not limited to proper installation in
a safe environment, personnel training and usage authorization,
proper inspection and maintenance, manual availability and compre­hension, application of safety devices, cutting/sanding/grinding tool
integrity, and the usage of personal protective equipment.

The manufacturer will not be held liable for injury or property damage
from negligence, improper training, machine modifications or misuse.

Some dust created by power sanding, sawing, grinding, drilling, and
other construction activities contains chemicals known to the State
of California to cause cancer, birth defects or other reproductive
harm. Some examples of these chemicals are:

• Lead from lead-based paints.

• Crystalline silica from bricks, cement and other masonry products.

• Arsenic and chromium from chemically-treated lumber.

Your risk from these exposures varies, depending on how often you
do this type of work. To reduce your exposure to these chemicals:
Work in a well ventilated area, and work with approved safety equip­ment, such as those dust masks that are specially designed to filter
out microscopic particles.

Table of Contents

INTRODUCTION ............................................... 2

Contact Info.................................................... 2

Manual Accuracy
Identification
Controls & Components
Machine Data Sheet

SECTION 1: SAFETY

Safety Instructions for Machinery
Additional Safety for Wet Sharpeners

SECTION 2: POWER SUPPLY

SECTION 3: SETUP

Unpacking
Needed for Setup
Inventory
Site Considerations
Assembly
Test Run

SECTION 4: OPERATIONS

Operation Overview

Workpiece Inspection................................... 17

Selecting Grinding Wheel
Caring for Grinding Wheel
Inspecting Grinding Wheel
Adjusting Torque
Installing Tool Rest
Using Tool Jig
Setting Tool Angle
Filling Reservoir
Installing/Removing Grinding Wheel
Grinding Wheel Rotation
Preparing Stropping Wheel
Replacing Stropping Wheel

.................................................... 12

...................................................... 12

..................................................... 13

...................................................... 15

........................................... 2

................................................... 3

................................. 4

...................................... 5

....................................... 7

.................. 7

........... 9

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....................................... 12

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....................................... 21

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............ 22

.............................. 23

.......................... 24

......................... 25

SECTION 5: ACCESSORIES

SECTION 6: MAINTENANCE

Schedule
Cleaning
Maintaining Grinding Wheel

SECTION 7: SERVICE

Troubleshooting
Replacing Motor Brushes

SECTION 8: WIRING

Wiring Safety Instructions
Wiring Diagram

SECTION 9: PARTS

Main
Labels & Cosmetics

WARRANTY & RETURNS

...................................................... 28

....................................................... 28

................................... 29

........................................... 29

............................ 31

...................................... 32

............................ 32

............................................ 33

....................................... 34

............................................................. 34

..................................... 36

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......................... 28

We stand behind our machines! If you have ques­tions or need help, contact us with the information
below. Before contacting, make sure you get the

serial number

machine ID label. This will help us help you faster.

We want your feedback on this manual. What did
you like about it? Where could it be improved?
Please take a few minutes to give us feedback.

Email: [e-mail]

We are proud to provide a high-quality owner’s
manual with your new machine!

We

instruc­tions, specifications, drawings, and photographs
in this manual. Sometimes we make mistakes, but
our policy of continuous improvement also means
that

you receive is

slightly different than shown in the manual

If you find this to be the case, and the difference
between the manual and machine leaves you
confused or unsure about something

check our

website for an updated version. W

current

manuals and

on our web-

site at

Alternatively, you can call our Technical Support
for help. Before calling, make sure you write
down the

serial number
from the machine ID label (see below). This
information is required for us to provide proper
tech support, and it helps us determine if updated
documentation is available for your machine.

INTRODUCTION

Contact Info

and manufacture date from the

Grizzly Technical Support

1815 W. Battlefield
Springfield, MO 65807
Phone: [phone]

Email: [e-mail]

Grizzly Documentation Manager

P.O. Box 2069

Bellingham, WA 98227-2069

Manual Accuracy

made every effort to be exact with the

sometimes the machine

.

,

e post

manual updates for free

www.grizzly.com.

manufacture date and

Manufacture Date

Serial Number

-2-

Model T32720 (Mfd. Since 06/21)

Identification

Become familiar with the names and locations of the controls and features shown below to better understand
the instructions in this manual.

Tool Jig

Variable-Speed

Lock Knob

Dial

Tool Jig

Tool Rest

Micro-Adjustment

Nut

Lock Knob

ON/OFF Switch
w/Disabling Key

Arbor

Stropping

Wheel

Torque

Adjustment

Knob

Tool Rest

Lock Knob

(1 of 4)

Tool Rest

Grinding

Wheel

Water

Reservoir

For Your Own Safety Read Instruction Manual Before Operating Grinder

a) Wear eye protection.
b) Use grinding wheel suitable for speed of grinder.

Like all machinery there is potential danger
when operating this machine. Accidents
are frequently caused by lack of familiarity
or failure to pay attention. Use this machine
with respect and caution to decrease the
risk of operator injury. If normal safety pre­cautions are overlooked or ignored, seri­ous personal injury may occur.

Model T32720 (Mfd. Since 06/21)

No list of safety guidelines can be com­plete. Every shop environment is different.
Always consider safety first, as it applies
to your individual working conditions. Use
this and other machinery with caution and
respect. Failure to do so could result in
serious personal injury, damage to equip­ment, or poor work results.

-3-

Controls &

To reduce your risk of
serious injury, read this
entire manual BEFORE

Components

Refer to the following figures and descriptions to
become familiar with the basic controls and com­ponents of this machine. Understanding these
items and how they work will help you understand
the rest of the manual and minimize your risk of
injury when operating this machine.

A

B

F

G

I

H

Figure 2. Grinding and stropping components.

F. Stropping Wheel: Spins to sharpen or "strop"

workpiece.

E

Figure 1. Tool rest components.

A. Tool Jig Lock Knob (1 of 2): Loosens to

adjust tool jig position or angle and tightens
to secure.

B. Tool Rest: Mounts in three different posi-

tions to support tool or tool jig as required for
operation.

C. Tool Rest Lock Knob (1 of 4): Secures tool

rest at desired mounting position.

D. Tool Rest Micro-Adjustment Nut: Adjusts

position of tool rest, in relation to grinding or
stropping wheel.

E. Tool Jig: Securely clamps workpiece at

desired angle and position.

D

C

G. Grinding Wheel: Spins to grind workpiece.

H. Water Reservoir: Holds water to cool grind-

ing wheel during operation, preventing exces­sive heat and sparks.

I. Torque Adjustment Knob: Adjusts drive

wheel tension to adjust torque.

J

K

Figure 3. Control panel components.

J. Variable-Speed Dial: Rotates to adjust

grinding/stropping wheel speed.

K. ON/OFF Switch w/Disabling Key: Turns

motor ON when moved up; turns motor OFF
when moved down. When key is removed,
switch is disabled and machine cannot start.

-4-

using machine.

Model T32720 (Mfd. Since 06/21)

Machine Data Sheet

MACHINE DATA

SHEET

Customer Service #: [phone] · To Order Call: [phone] · Fax #: [phone]

MODEL T32720 10" VARIABLE‐SPEED WET SHARPENER

Product Dimensions:

Weight................................................................................................................................................................ 26 lbs.

Width (side-to-side) x Depth (front-to-back) x Height............................................................... 18-1/2 x 15-1/2 x 15 in.

Footprint (Length x Width)....................................................................................................................... 11-1/2 x 9 in.

Shipping Dimensions:

Type..................................................................................................................................................... Cardboard Box

Content........................................................................................................................................................... Machine

Weight................................................................................................................................................................ 28 lbs.

Length x Width x Height....................................................................................................................... 17 x 13 x 15 in.

Must Ship Upright.................................................................................................................................................... No

Electrical:

Power Requirement........................................................................................................... 120V, Single-Phase, 60 Hz

Full-Load Current Rating....................................................................................................................................... 1.4A

Minimum Circuit Size.............................................................................................................................................. 15A

Connection Type....................................................................................................................................... Plug & Cord

Power Cord Included.............................................................................................................................................. Yes

Power Cord Length.............................................................................................................................................. 78 in.

Power Cord Gauge......................................................................................................................................... 18 AWG

Plug Included.......................................................................................................................................................... Yes

Included Plug Type................................................................................................................................................ 1-15

Switch Type...................................................................................................... Paddle Safety Switch w/Disabling Key

Motors:

Main

Horsepower................................................................................................................................................. 80W

Phase............................................................................................................................................ Single-Phase

Amps......................................................................................................................................................... 0.65A

Speed..................................................................................................................................... 1950 - 3250 RPM

Type..................................................................................................................................................... Universal

Power Transfer ......................................................................................................................................... Direct

Bearings..................................................................................................... Shielded & Permanently Lubricated

Centrifugal Switch/Contacts Type.......................................................................................................... Internal

Main Specifications:

Operation Info

Grinder Type....................................................................................................................................... Benchtop

Right Wheel Material................................................................................................... ABS/Leather (Stropping)

Left Wheel Material................................................................................................. Aluminum Oxide (Grinding)

Right Wheel Diameter........................................................................................................................... 8-7/8 in.

Left Wheel Diameter.................................................................................................................................. 10 in.

Right Wheel Thickness........................................................................................................................ 1-3/16 in.

Left Wheel Thickness............................................................................................................................ 2-1/2 in.

Wheel Bore............................................................................................................................................... 1/2 in.

Minimum Wheel Speed Rating............................................................................................................ 150 RPM

Model T32720 (Mfd. Since 06/21)

-5-

Spindle

Spindle Speed.............................................................................................................................. 90 - 150 RPM

Spindle Diameter...................................................................................................................................... 1/2 in.

Right Spindle Diameter............................................................................................................................... 8mm

Right Spindle Thread Pitch................................................................................................................... 1.25 TPI

Right Spindle Thread Direction........................................................................................................ Right-Hand

Right Spindle Length................................................................................................................................... 1 in.

Left Spindle Diameter............................................................................................................................... 12mm

Left Spindle Thread Pitch...................................................................................................................... 1.75 TPI

Left Spindle Thread Direction............................................................................................................. Left-Hand

Left Spindle Length................................................................................................................................ 1-7/8 in.

Table Info

Work Rest Width.................................................................................................................................... 1-5/8 in.

Work Rest Length.................................................................................................................................. 5-1/4 in.

Work Rest Thickness.............................................................................................................................. 1/16 in.

Work Rest Tilt....................................................................................................................................... 360 deg.

Construction

Base......................................................................................................................................................... Plastic

Work Rest................................................................................................................................................... Steel

Coolant Trough........................................................................................................................................ Plastic

Other Specifications:

Country of Origin ................................................................................................................................................ China

Warranty ........................................................................................................................................................... 1 Year

Serial Number Location ................................................................................................................... Machine ID Label

Features:

Work Rest Micro-Adjustment
Includes Tool Jig & Angle Guide
Variable-Speed Dial
Leather Stropping Wheel
220-Grit Aluminum-Oxide Grinding Wheel

-6-

Model T32720 (Mfd. Since 06/21)

SECTION 1: SAFETY

For Your Own Safety, Read Instruction

Manual Before Operating This Machine

The purpose of safety symbols is to attract your attention to possible hazardous conditions.
This manual uses a series of symbols and signal words intended to convey the level of impor­tance of the safety messages. The progression of symbols is described below. Remember that
safety messages by themselves do not eliminate danger and are not a substitute for proper
accident prevention measures. Always use common sense and good judgment.

Indicates an imminently hazardous situation which, if not avoided,
WILL result in death or serious injury.

Indicates a potentially hazardous situation which, if not avoided,
COULD result in death or serious injury.

Indicates a potentially hazardous situation which, if not avoided,
MAY result in minor or moderate injury. It may also be used to alert
against unsafe practices.

Alerts the user to useful information about proper operation of the

NOTICE

machine to avoid machine damage.

Safety Instructions for Machinery

OWNER’S MANUAL. Read and understand this

owner’s manual BEFORE using machine.

TRAINED OPERATORS ONLY. Untrained oper­ators have a higher risk of being hurt or killed.
Only allow trained/supervised people to use this
machine. When machine is not being used, dis­connect power, remove switch keys, or lock-out
machine to prevent unauthorized use—especially
around children. Make your workshop kid proof!

DANGEROUS ENVIRONMENTS. Do not use
machinery in areas that are wet, cluttered, or have
poor lighting. Operating machinery in these areas
greatly increases the risk of accidents and injury.

MENTAL ALERTNESS REQUIRED. Full mental
alertness is required for safe operation of machin­ery. Never operate under the influence of drugs or
alcohol, when tired, or when distracted.

ELECTRICAL EQUIPMENT INJURY RISKS.
You can be shocked, burned, or killed by touching
live electrical components or improperly grounded
machinery. To reduce this risk, only allow qualified
service personnel to do electrical installation or
repair work, and always disconnect power before
accessing or exposing electrical equipment.

DISCONNECT POWER FIRST.
nect machine from power supply BEFORE mak­ing adjustments, changing tooling, or servicing
machine. This prevents an injury risk from unin­tended startup or contact with live electrical com­ponents.

EYE PROTECTION. Always wear ANSI-approved
safety glasses or a face shield when operating or
observing machinery to reduce the risk of eye
injury or blindness from flying particles. Everyday
eyeglasses are NOT approved safety glasses.

Always discon-

Model T32720 (Mfd. Since 06/21)

-7-

WEARING PROPER APPAREL. Do not wear
clothing, apparel or jewelry that can become
entangled in moving parts. Always tie back or
cover long hair. Wear non-slip footwear to reduce
risk of slipping and losing control or accidentally
contacting cutting tool or moving parts.

HAZARDOUS DUST. Dust created by machinery
operations may cause cancer, birth defects, or
long-term respiratory damage. Be aware of dust
hazards associated with each workpiece mate­rial. Always wear a NIOSH-approved respirator to
reduce your risk.

HEARING PROTECTION. Always wear hear­ing protection when operating or observing loud
machinery. Extended exposure to this noise
without hearing protection can cause permanent
hearing loss.

REMOVE ADJUSTING TOOLS. Tools left on
machinery can become dangerous projectiles
upon startup. Never leave chuck keys, wrenches,
or any other tools on machine. Always verify
removal before starting!

USE CORRECT TOOL FOR THE JOB. Only use
this tool for its intended purpose—do not force
it or an attachment to do a job for which it was
not designed. Never make unapproved modifica­tions—modifying tool or using it differently than
intended may result in malfunction or mechanical
failure that can lead to personal injury or death!

AWKWARD POSITIONS. Keep proper footing
and balance at all times when operating machine.
Do not overreach! Avoid awkward hand positions
that make workpiece control difficult or increase
the risk of accidental injury.

CHILDREN & BYSTANDERS. Keep children and
bystanders at a safe distance from the work area.
Stop using machine if they become a distraction.

GUARDS & COVERS. Guards and covers reduce
accidental contact with moving parts or flying
debris. Make sure they are properly installed,
undamaged, and working correctly BEFORE
operating machine.

FORCING MACHINERY. Do not force machine.
It will do the job safer and better at the rate for
which it was designed.

NEVER STAND ON MACHINE. Serious injury
may occur if machine is tipped or if the cutting
tool is unintentionally contacted.

STABLE MACHINE. Unexpected movement dur­ing operation greatly increases risk of injury or
loss of control. Before starting, verify machine is
stable and mobile base (if used) is locked.

USE RECOMMENDED ACCESSORIES. Consult
this owner’s manual or the manufacturer for rec­ommended accessories. Using improper acces­sories will increase the risk of serious injury.

UNATTENDED OPERATION. To reduce the
risk of accidental injury, turn machine OFF and
ensure all moving parts completely stop before
walking away. Never leave machine running
while unattended.

MAINTAIN WITH CARE. Follow all maintenance
instructions and lubrication schedules to keep
machine in good working condition. A machine
that is improperly maintained could malfunction,
leading to serious personal injury or death.

DAMAGED PARTS. Regularly inspect machine
for damaged, loose, or mis-adjusted parts—or
any condition that could affect safe operation.
Immediately repair/replace BEFORE operating
machine. For your own safety, DO NOT operate
machine with damaged parts!

MAINTAIN POWER CORDS. When disconnect­ing cord-connected machines from power, grab
and pull the plug—NOT the cord. Pulling the cord
may damage the wires inside. Do not handle
cord/plug with wet hands. Avoid cord damage by
keeping it away from heated surfaces, high traffic
areas, harsh chemicals, and wet/damp locations.

EXPERIENCING DIFFICULTIES. If at any time
you experience difficulties performing the intend­ed operation, stop using the machine! Contact our
Technical Support at [phone].

-8-

Model T32720 (Mfd. Since 06/21)

Additional Safety for Wet Sharpeners

Serious injury or death can occur from impact injuries if grinding wheel breaks apart during use.
Entanglement/amputation injuries can occur from being caught in moving parts or in-running
pinch points. Flying sparks can ignite explosive or flammable materials. Rotating grinding
wheels can easily remove skin. To minimize risk of getting hurt or killed, anyone operating
machine MUST completely heed hazards and warnings below.

AVOIDING ENTANGLEMENT. Becoming entan-

gled in moving parts can cause severe injury or
death. Keep all guards and covers in place; DO
NOT wear loose clothing, gloves, or jewelry; and
tie back long hair.

STARTING SHARPENER. If grinding wheel is

damaged, it will usually fly apart shortly after
startup. To protect yourself, always stand to side
of sharpener when turning it ON and allow it to
run for at least one minute before standing in front
of it. Never grind with wheel that vibrates.

WHEEL SPEED RATING. Wheels operated at a

faster speed than rated for may break apart dur­ing operation. Before mounting a new wheel, be
sure wheel RPM rating is equal to or higher than
speed of sharpener. Never use unmarked wheels
or wheel rated for a lower speed than sharpener.

NEWLY GROUND TOOLS WILL BE HOT.

Cutting tools can be sharp and get hot during
grinding operations. Use leather gloves or shop
rags to protect your hands when installing or
removing cutting tools from tool jig or clamp.
Remove gloves before operating sharpener.

EYE, FACE, & LUNG PROTECTION. Grinding
ejects small particles at a high rate of speed.
These particles can cause blindness, skin injuries
or respiratory damage. ALWAYS wear approved
clothing, safety goggles, face shield, and respira­tor for type of grinding.

TOOL REST POSITION. The space between the
tool rest and grinding wheel forms an "in-running
nip point" gap which may cause workpiece to be
pulled down, leading to loss of control and pulling
your hand into grinding wheel. Keep this in mind
when operating to avoid pinching, crushing, and
abrasion injuries.

SIDE GRINDING. Grinding on side of grinding
wheel can cause it to crack and burst—unless
wheel is rated for side grinding.

WHEEL INSPECTION. Verify that grinding wheel
is free of cracks, chips, or dents in wheel surface
before installing. Do not use wheel if it has any
of these problems or it could break apart during
operation. Replace wheel or shaft bearings imme­diately. Perform a "ring test" on grinding wheel
before installation to ensure it is safe to use. A
wheel that does NOT pass ring test may break or
fly apart during operation.

WHEEL ATTACHMENT. Do not use warped or
damaged washers to mount grinding or strop­ping wheel. Only tighten
nut enough to drive wheel and prevent slippage
to reduce risk of cracking grinding wheel when
tightening.

TRANSPORT. Carry sharpener by holding base.
DO NOT use universal support as handle, as it
can slide out. Dropping sharpener could result in
crushing injuries and property damage.

grinding wheel spindle

HAND & WHEEL CONTACT. Keep firm grip on
workpiece and position hands safe distance away
when grinding. Anticipate when workpiece will
heat up, and cool it before it becomes too hot to
hold, or use appropriate clamp. Avoid wearing
gloves as they may get caught in grinding wheel
and cause more serious entanglement injuries.

Model T32720 (Mfd. Since 06/21)

WATER LEVEL. Do not dry grind on this machine.
Dry grinding or insufficient water can overheat and
damage wheel, damage workpiece, and increase
airborne dust. A damaged wheel could break
apart during operation and cause impact injuries.
Always maintain proper water level in water reser­voir while operating grinding wheel.

-9-

SECTION 2: POWER SUPPLY

Before installing the machine, consider the avail­ability and proximity of the required power supply
circuit. If an existing circuit does not meet the
requirements for this machine, a new circuit must
be installed. To minimize the risk of electrocution,
fire, or equipment damage, installation work and
electrical wiring must be done by an electrician or
qualified service personnel in accordance with all
applicable codes and standards.

or equipment damage
may occur if machine is
not properly grounded
and connected to power

The full-load current rating is the amperage a
machine draws at 100% of the rated output power.
On machines with multiple motors, this is the
amperage drawn by the largest motor or sum of all
motors and electrical devices that might operate
at one time during normal operations.

The full-load current is not the maximum amount
of amps that the machine will draw. If the machine
is overloaded, it will draw additional amps beyond
the full-load rating.

If the machine is overloaded for a sufficient length
of time, damage, overheating, or fire may result—
especially if connected to an undersized circuit.
To reduce the risk of these hazards, avoid over­loading the machine during operation and make
sure it is connected to a power supply circuit that
meets the specified circuit requirements.

For your own safety and protection of

Note: Circuit requirements in this manual apply to

a dedicated circuit—where only one machine will
be running on the circuit at a time. If machine will
be connected to a shared circuit where multiple
machines may be running at the same time, con­sult an electrician or qualified service personnel to
ensure circuit is properly sized for safe operation.

A power supply circuit includes all electrical
equipment between the breaker box or fuse panel
in the building and the machine. The power sup­ply circuit used for this machine must be sized to
safely handle the full-load current drawn from the
machine for an extended period of time. (If this
machine is connected to a circuit protected by
fuses, use a time delay fuse marked D.)

This machine is prewired to operate on a power
supply circuit that has a verified ground and meets
the following requirements:

process. DO NOT connect to power until

Availability

Electrocution, fire, shock,

Serious injury could occur if you connect
machine to power before completing setup

instructed later in this manual.

120V Circuit Requirements

Nominal Voltage .................... 110V, 115V, 120V

..........................................................60 Hz

Cycle
Phase
Power Supply Circuit

........................................... Single-Phase

......................... 15 Amps

supply.

Full-Load Current Rating

Full-Load Current Rating at 120V .... 1.4 Amps

-10 -

property, consult an electrician if you are
unsure about wiring practices or electrical
codes in your area.

Model T32720 (Mfd. Since 06/21)

Polarized Plug

To reduce the risk of electric shock, this equip­ment has a polarized plug (one blade is wider
than the other). This plug will fit in a polarized
outlet only one way. If the plug does not fit fully in
the outlet, reverse the plug. If it still does not fit,
contact a qualified electrician to install the proper
outlet. Do not change the plug in any way.

Extension Cords

When using extension cords, make sure the cords
are rated for outdoor use. Outdoor use cords are
marked with a "W-A" or a "W" to signify their rat­ing. Always check to make sure that the extension
cords are in good working order and free of any
type of damage, such as exposed wires, cuts,
creased bends, or missing prongs.

When servicing use only identical replacement
parts.

5-15 Receptacle

1-15 Plug

Hot

Figure 4. Typical 1-15 plug and 5-15 receptacle.

Neutral

Extension cords cause voltage drop, which may
damage electrical components and shorten motor
life. Voltage drop increases as the extension cord
size gets longer and the gauge size gets smaller
(higher gauge numbers indicate smaller sizes.
When using extension cords, always choose the
shortest cord possible, with the greatest-sized
gauge.

Below is a list of minimum gauge sizes needed for
running this tool at different lengths:

25 Feet
50 Feet
100 Feet
Over 100 Feet

.................................................... 18AWG

.................................................... 16AWG

.................................................. 16AWG

.................... Not Recommended

Model T32720 (Mfd. Since 06/21)

-11-

SECTION 3: SETUP

The following is a list of items shipped with your
machine. Before beginning setup, lay these items
out and inventory them.

If any non-proprietary parts are missing (e.g. a
nut or a washer), we will gladly replace them; or
for the sake of expediency, replacements can be
obtained at your local hardware store.

This machine was carefully packaged for safe
transport. When unpacking, separate all enclosed
items from packaging materials and inspect them
for shipping damage.

,

please

at [phone].

IMPORTANT:

you are completely satisfied with the machine and
have resolved any issues between Grizzly or the
shipping agent. You MUST have the original pack-

aging to file a freight claim. It is also extremely
helpful if you need to return your machine later.

Serious injury could occur if you connect

process. DO NOT connect to power until

Unpacking

If items are damaged

call us immediately

Save all packaging materials until

Needed for Setup

The following items are needed, but not included,
for the setup/assembly of this machine.

Description Qty

• String or Cord 24" ....................................... 1

• Screwdriver w/Plastic Handle ..................... 1

• Open-End Wrench or Socket 3⁄4" ................ 1

Inventory

Inventory (Figure 5) Qty

A. Grinding Wheel 220-Grit ............................ 1

B. To ol Ji g ....................................................... 1

C. Lock Knobs 3⁄4"-24 x 7⁄8" .............................. 2

D. Angle Guide................................................ 1

E. Too l Re st .................................................... 1

F. Abrasive Stropping Paste ..................2.5 Oz.

A

B

C

machine to power before completing setup

instructed later in this manual.

-12-

F

Figure 5. Inventory.

E

D

NOTICE

If you cannot find an item on this list, care­fully check around/inside the machine and
packaging materials. Often, these items get
lost in packaging materials while unpack­ing or they are pre-installed at the factory.

Model T32720 (Mfd. Since 06/21)

Site Considerations

vised around this machine.

or disable start switch or

Refer to the Machine Data Sheet for the weight
and footprint specifications of your machine.
Some workbenches may require additional rein­forcement to support the weight of the machine
and workpiece materials.

Consider anticipated workpiece sizes and addi­tional space needed for auxiliary stands, work
tables, or other machinery when establishing a
location for this machine in the shop. Below is
the minimum amount of space needed for the

Assembly

Workbench Load

Placement Location

18½"

15½"

The machine must be fully assembled before it
can be operated. Before beginning the assembly
process, refer to Needed for Setup and gather
all listed items.

To assemble machine:

Loosen torque adjustment knob all the way

1.

(see Figure 7).

Torque Adjustment

Knob

Figure 7. Location of torque adjustment knob.

=

Electrical Connection

Figure 6. Minimum working clearances.

Children and visitors may be
seriously injured if unsuper-

Lock entrances to the shop

power connection to prevent
unsupervised use.

2.

Turn machine on its side to access inside of

base and remove foam packaging.

Push motor down as far as it will go (see

3.
Figure 8).

Tighten torque adjustment knob until cap on

4.

shaft contacts motor (see Figure 8).

Direction to Push Motor

Cap

Motor

Model T32720 (Mfd. Since 06/21)

Figure 8. Torque adjustment knob tightened so

cap contacts motor.

-13-

5. Turn machine right-side up.

6. Inspect grinding wheel for flaws before install-
ing (refer to Inspecting Grinding Wheel on
Page 19).

Blotters

— If wheel is damaged, replace wheel before

proceeding with Assembly.

— If wheel is undamaged, proceed to Step 7.

Remove grinding wheel arbor hex nut and

7.

outer washer (see Figure 9).

Arbor

Hex Nut

Grinding Wheel

Outer Washer

Figure 9. Location of grinding wheel arbor hex

nut and outer washer.

Arbor

Hex Nut

m

n

u

O

n

i

x

i

m

d

u

e

l

A

Inner

Washer

Grinding Wheel

M

P

R

0

5

1

Outer Washer

Figure 10. Assembly order for wheel installation.

Install (2) lock knobs at locations shown in

9.
Figure 11.

Mount grinding wheel components in order

8.

shown in Figure 10. Tighten arbor hex
nut snugly but do not over-tighten. Over­tightening can stress and crack wheel.

— Paper discs or "blotters" should always

be used to absorb any pressure from
mounting hardware to prevent wheel from
cracking. Grinding wheel that ships with
this sharpener already comes with a blot­ter present on each side. Part number
PT32720105 on Page 36 can be used to
replace missing or damaged blotter before
proceeding and performing Test Run. If
replacing with a different grinding wheel,
refer to wheel manufacturer to obtain
correct blotters.

Figure 11. Lock knobs installed on machine.

-14-

Model T32720 (Mfd. Since 06/21)

Test Run

Once assembly is complete, test run the machine
to ensure it is properly connected to power and
safety components are functioning correctly.

If you find an unusual problem during the test run,
immediately stop the machine, disconnect it from
power, and fix the problem BEFORE operating the
machine again. The

table in the

SERVICE section of this manual can help.

DO NOT start machine until all preceding
setup instructions have been performed.
Operating an improperly set up machine

ed results that can lead to serious injury,

Serious injury or death can result from

Troubleshooting

The Test Run consists of verifying the following:

1) The motor powers up and runs correctly, and

2) the switch disabling key disables the switch
properly.

using this machine BEFORE understanding
its controls and related safety information.
DO NOT operate, or allow others to operate,
machine until the information is understood.

Variable-Speed

Dial

Figure 12. Control panel components.

3. Connect machine to power supply.

4. Move ON/OFF switch up to turn machine ON

(see Figure 12).

Verify motor operation by slowly turning vari-

5.

able-speed dial clockwise. Rotate dial back
and forth to test variable-speed function.

Motor should run smoothly and without

unusual vibrations or noises.

Switch

Disabling

Key

ON/OFF

Switch

may result in malfunction or unexpect-

death, or machine/property damage.

To test run machine:

Clear all setup tools away from machine.

1.

2. Turn variable-speed dial all the way counter-

clockwise and make sure ON/OFF switch is
in OFF position (see Figure 12).

Model T32720 (Mfd. Since 06/21)

Turn variable-speed dial all the way counter-

6.

clockwise, then move ON/OFF switch down
to turn motor OFF.

Remove switch disabling key (see Figure 12).

7.

Try to start machine with ON/OFF switch.

8.

The machine should not start.

— If machine does not start, switch dis-

abling feature is working correctly.
Congratulations! Test Run is complete.

— If machine does start, immediately stop

machine. Switch disabling feature is not
working correctly. This safety feature must
work properly before proceeding with reg­ular operations. Call Tech Support for
help.

-15-

SECTION 4: OPERATIONS

The purpose of this overview is to provide the nov­ice machine operator with a basic understanding
of how the machine is used during operation, so
the

discussed later

in this manual

Due to the generic nature of this overview, it is
not intended to be an instructional guide. To learn
more about specific operations, read this entire
manual,

training from experienced
machine operators
outside of this manual by reading "how-to" books,
trade magazines, or websites.

To reduce your risk of
serious injury, read this
entire manual BEFORE

Wear personal protective equipment to

Keep hair, clothing, and

ing parts at all times.
Entanglement can result
in death, amputation, or

Operation Overview

machine controls/components

are easier to understand.

seek additional

, and do additional research

Typical Grinding Operation

The grinding function of the Model T32720 will
sharpen dull cutting edges on tools to keep them
cutting or carving their best.

To complete a typical grinding operation, the
operator does the following:

Examines workpiece to make sure it is suit-

1.

able for grinding.

Selects correct wheel for type of workpiece,

2.

inspects wheel to ensure there are no cracks
or damage, performs a "ring test," and installs
wheel.

Adjusts tool rest and tool jig as needed for

3.

operation.

Secures workpiece in tool jig and adjusts

4.

workpiece angle if necessary.

using machine.

Eye and face injuries and respiratory prob­lems can occur while operating this tool.

reduce your risk from these hazards.

jewelry away from mov-

Ensures ON/OFF switch is in OFF position

5.

and connects machine to power supply.

Puts on personal protective equipment (PPE).

6.

7. Fills water reservoir.

8. Stands aside, turns machine ON, allows

wheels to reach full speed, and runs machine
for at least one minute to ensure grinding
wheel does not fly apart from centrifugal force
of rotation.

Grinds workpiece.

9.

10. During and after grinding operation, quench-

es workpiece as required to prevent surface
hardening or temper loss.

Stops machine.

11.

-16 -

severe crushing injuries!

Model T32720 (Mfd. Since 06/21)

Typical Stropping Operation

The stropping function of the Model T32720 will
polish cutting edges and remove fine burrs left
after grinding.

Workpiece

Inspection

To complete a typical stropping operation,
the operator does the following:

Examines workpiece to make sure it is suit-

1.

able for sharpening.

Installs tool rest in horizontal position over

2.

stropping wheel to sharpen with wheel
rotation.

Secures workpiece in tool jig (if necessary).

3.

4. Applies light machine oil and abrasive honing

paste to stropping wheel.

Ensures ON/OFF switch is in OFF position

5.

and connects machine to power supply.

Puts on personal protective equipment (PPE).

6.

7. Stands aside, turns machine ON, and distrib-

utes honing paste on leather face of wheel
until it is evenly applied.

Rests workpiece (or jig, if used) against tool

8.

rest and sharpens workpiece.

Stops machine.

9.

Some workpieces are not suitable for grinding
on this sharpener. Before grinding, inspect all

workpieces for the following:

• Hard Workpiece: Workpieces that are made
of stone, carbide, stainless steel, ceramics,
glass, or have hardened welds will wear out
most general-grade grinding wheels quickly.
If hard materials are to be ground, you must
install the correct type of grinding wheel.

• Soft Workpiece: Workpieces that are made
of aluminum, brass, lead, and other nonfer­rous metals will load up in the grinding wheel
and render the abrasive useless. Grinding
wood, plastics, rubber, fiberglass, or other
soft materials can also cause the same
problem and lead to the wheel overheating
and possibly bursting during use if ignored.
To restore a loaded grinding wheel surface,
redress with a dressing tool.

• Flexible/Unstable Workpiece: Grinding on
the side or the ends of cable, chain, or round
workpieces creates the hazard of workpiece
twist or grab, leading to entanglement with
the wheel or shaft. This hazard must be
avoided.

If you are not experienced with this type
of machine, WE STRONGLY RECOMMEND
that you seek additional training outside of
this manual. Read books/magazines or get
formal training before beginning any proj­ects. Regardless of the content in this sec­tion, Grizzly Industrial will not be held liable
for accidents caused by lack of training.

Model T32720 (Mfd. Since 06/21)

• Loose Parts: Make sure that the workpiece
is free of any parts like springs, pins, balls,
or other components that may loosen or dis­lodge during grinding, and hit the operator.

• Strength: Make sure that the workpiece is
strong enough to be ground. Should it break,
the broken piece may dig into the wheel and
cause kickback or severe injury.

-17-

Selecting

Caring for

Grinding Wheel

The Model T32720 sharpener only accepts Type
5 grinding wheels with a 1⁄2 " bore.

Aluminum-oxide and silicon-carbide wheels are
marked in a somewhat uniform manner by all
the major manufacturers. Understanding these
markings will help you understand the capabilities
of various wheels. Always refer to the manufac­turer’s grinding recommendations when selecting
a wheel for your project.

The basic format for wheel numbering is:

Prefix

1 A 60 L V

The Prefix is the manufacturer’s designation for a
particular wheel type (eg. Type 1 wheels).

The most common Abrasive Types used are A
for Aluminum Oxide, C for Silicon Carbide, and
occasionally SG for Seeded Gel.

The Grit Size is a number that refers to the size
of the abrasive grain in the wheel. The lower the
number, the coarser the wheel. Ten is a very
coarse wheel for roughing and 220 is usually the
upper range for fine finish work.

Grade is an indication of the hardness of the
wheel—“A” being softest and “Z” being hardest.

Abrasive

Typ e

Grit Size Grade

Bond

Typ e

Grinding Wheel

When grinding, your safety depends to a large
degree on the condition of the wheel. A wheel in
poor condition presents the possibility of breaking
apart during rotation and injuring the operator and
bystanders in the area.

Tips to help you avoid breaking the wheel:

• Always transport, store and handle wheels
with care. Wheels may be damaged if they
are dropped or if heavy objects are stacked
on them.

• Select the right grinding wheel for the job.
DO NOT grind material inappropriate for the
wheel type.

• Only use wheels that are rated for the RPM
of the sharpener.

• Mount the wheel properly (see Installing/
Removing Grinding Wheel on Page 22).

• DO NOT push the workpiece into the grind­ing wheel with such force that it causes the
sharpener to bog down. DO NOT apply pres­sure to stop wheel after turning sharpener
OFF.

• Dress the wheel when necessary (see
Maintaining Grinding Wheel on Page 28).
Do not allow it to become glazed. Dress
wheel so the surface is parallel with the uni­versal support.

Bond Type refers to the type of bonding material
used to hold the abrasive material. Most general
purpose wheels will have a “V” indicating Vitrified
Clay is used. Vitrified Clay provides high strength
and good porosity. The other common bond type
is “B” for resin where synthetic resins are used.
These are used to grind cemented carbide and
ceramic materials.

Note: There may be other numbers inserted that
have meaning for a particular type of wheel. Refer
to the manufacturer’s technical data for a com­plete explanation.

-18-

• DO NOT store wheels in damp or wet
locations.

• DO NOT overtighten the nut when mounting
the wheel.

• DO NOT leave the wheel mounted when
machine is not in use.

• Use older grinding wheels first and refer to
manufacturer's information to prevent wheels
from outlasting their shelf life.

Model T32720 (Mfd. Since 06/21)

Inspecting

Grinding Wheel

— An undamaged grinding wheel will emit a

clear metallic ring or “ping” sound in each
of these spots. A damaged grinding wheel
will respond with a dull thud that has no
clear tone.

Before mounting a new grinding wheel, it must be
inspected. Do not assume that a wheel is in sound
condition just because it is new—often damage
can occur in shipping, with age, or with exposure
to moisture.

First, do a Visual Inspection. Look for any
cracks, chips, nicks or dents in the surface of the
wheel. If you see any of these, DO NOT use the
wheel.

Second, do a Ring Test. This test will give you an
indication of any internal damage that may not be
obvious during a visual inspection.

To perform ring test:

Make sure grinding wheel tested is clean and

1.

dry; otherwise, you may get false results.

If size permits, balance grinding wheel with

2.

your finger in mounting hole. If this is not pos­sible, hang wheel in air with a piece of cord or
string looped through mounting hole.

At spots shown in Figure 13, gently tap grind-

3.

ing wheel with a light non-metallic device
such as handle of a screwdriver or a wooden
mallet.

— If you determine from ring test that grind-

ing wheel is damaged, DO NOT use it!

Adjusting Torque

The torque adjustment knob adjusts the pres­sure of the motor shaft against the drive wheel.
If you notice either of the wheels "slipping" or not
rotating at a constant rate during operations, the
torque needs to be adjusted.

To adjust torque:

Turn machine ON and begin operation.

1.

— If wheel rotates at constant rate while

applying workpiece pressure, torque is
adjusted correctly.

— If wheel does not rotate at constant rate

while applying workpiece pressure, torque
is not adjusted correctly. Turn torque
adjustment knob clockwise until wheel
does not slip while desired workpiece
pressure is applied (see Figure 14).

STOP

Rated 3500 RPM

Make sure your grinder is not

faster than the rated RPM of this wheel

Type-1

Aluminum

Oxide

Grinding can be dangerous
Visually inspect this wheel

for cracks, nicks,chips

WARNING

60 Grit

Grade L

Vitrified Bond

Figure 13. Tapping locations when performing a

ring test.

Note: Finding exact spot to tap may take sev-

eral attempts.

Model T32720 (Mfd. Since 06/21)

Torque Adjustment

Knob

Figure 14. Location of torque adjustment knob.

2. Turn machine OFF.

Note: Turn torque adjustment knob counter-

clockwise to release motor pressure when
sharpener is not in use to preserve torque
components.

-19 -

Installing Tool Rest

Using Tool Jig

The Model T32720 is equipped with a tool rest
that can be mounted vertically or horizontally. It
serves as an attachment point for jigs and other
accessories and provides a solid place to rest
workpieces. A micro-adjustment nut fine-tunes
the height of the tool rest, and the lock knobs at
each attachment point quickly secure the position.

To install tool rest:

DISCONNECT MACHINE FROM POWER!

1.

2. Insert tool rest into desired mounting holes
(see Figure 15). Refer to Grinding Wheel
Rotation on Page 23 to determine what posi-

tion is needed for grinding operation.

Turn micro-adjustment nut shown in Figure

3.
15 to adjust tool rest height.

Tighten (2) lock knobs shown in Figure 15 to

4.

secure tool rest position.

The tool jig is designed to secure a variety of tools
during operations to hold them steady for a good
flat edge.

To use tool jig:

DISCONNECT MACHINE FROM POWER!

1.

2. Slide tool jig onto tool rest (see Figure 16).

Tool Jig

Tool Rest

Tool Rest

Micro-Adjustment

Nut

Lock Knob

(1 of 2)

Figure 15. Tool rest inserted in vertical mounting

holes.

Tool rest should never be placed in vertical
mounts for use with stropping wheel.
Working against wheel rotation will cause
severe damage to stropping wheel.

Figure 16. Tool jig mounted on tool rest.

3.

Insert tool between faces of jig clamp, as

shown in Figure 17, and tighten (2) tool jig
lock knobs.

Note: Set grinding tool angle before tighten-

ing lock knobs (refer to Setting Tool Angle
on Page 21).

Tool

Tool Jig

Lock Knob

(1 of 2)

-20-

Figure 17. Tool secured in tool jig.

Model T32720 (Mfd. Since 06/21)

Setting Tool Angle

Filling Reservoir

The Model T32720 comes with an angle guide to
help identify and maintain the cutting angle on a
workpiece for grinding operations.

Note: Grinding wheels wear smaller through use,
so the angle guide will be most accurate with a
new, 10" diameter wheel.

To set tool angle:

Determine angle notch (see Figure 18) that

1.

best fits the tool you wish to grind by placing
beveled edge of tool into notches.

Place desired angle notch against grinding

2.

wheel so angle guide edge creates guide for
positioning tool (see Figure 18).

Place tool tip between guide edge and wheel,

3.

and adjust positioning of tool jig and tool
rest so sharpened edge of tool is flat against
both grinding wheel and guide edge (see
Figure 18).

This machine is designed for wet grinding, and
the grinding wheel should never be used without
water filled to the top of the reservoir. Dry grinding
with this machine can damage not only the wheel,
but also the tool or the blade you are grinding. A
dry wheel will soak up a lot of water in the first 15
minutes of saturation, so be sure to add water as
needed before performing any grinding operation.

Clean and refill the reservoir whenever you notice
sediment in the water to keep from clogging the
wheel and decreasing the effectiveness of the
sharpener.

Tip: Place a magnet in the reservoir to catch and
collect metal filings. This will help prevent exces­sive metal accumulation on the grinding wheel.

The mounting tabs on the reservoir attach to the
reservoir mounting slots (see Figure 19). Begin
by mounting the reservoir in the lowest mounting
slots, then move the reservoir to the higher slots
to keep the wheel running through the water as
the grinding wheel wears down.

Guide

Edge

Desired

Angle Notch

Figure 18. Example of using angle guide to

adjust tool angle.

Mounting Slot

Mounting Tab

Figure 19. Reservoir mounting components.

DO NOT allow grinding wheel to stay
immersed in water for long periods of time
while unused. Water can saturate wheel,
causing it to become unbalanced and
potentially cause sections of wheel to break
off when sharpener is started. Always empty
or remove reservoir when grinding wheel
will not be used.

Model T32720 (Mfd. Since 06/21)

-21-

Installing/Removing

Grinding Wheel

Wheels with varying grit are useful for different
operations and workpiece materials. DO NOT
leave a wheel mounted when the machine is not
in use.

ALWAYS visually inspect and perform a
“ring test” on a wheel before installing. DO
NOT use damaged wheels!

Tool Needed Qty

Open-End Wrench or Socket 3⁄4" ....................... 1

To install/remove grinding wheel:

DISCONNECT MACHINE FROM POWER!

1.

2. Remove arbor hex nut and outer flat washer
(see Figure 20).

Warped washers can contribute to grinding
wheel breaking and flying apart. Never use
warped washers. Always check washers
before installing grinding wheel.

5. Mount new grinding wheel in order shown

in Figure 21. Tighten arbor hex nut snugly
but do not over-tighten. Over-tightening can
stress and crack wheel.

— Paper discs or "blotters" should always be

used to absorb any pressure from mount­ing hardware to prevent wheel from crack­ing. Grinding wheel that ships with this
sharpener (PT32720003) already comes
with a blotter present on each side. Part
number PT32720105 on Page 36 can
be used to replace missing or damaged
blotter. If replacing with a different grind­ing wheel, refer to wheel manufacturer to
obtain correct blotters.

Blotters

Arbor

Hex Nut

Outer Washer

Figure 20. Grinding wheel removal components.

Tip: Hold grinding wheel with free hand to

stop it from turning while loosening arbor nut.

Note: Spindle on left side of sharpener has

left-hand threads. Turn it clockwise to loosen.

Remove grinding wheel from spindle.

3.

4. Verify flatness of inner and outer washers

by placing them on a level surface. Replace
warped or damaged washers and blotters.

Arbor

Hex Nut

m

n

u

O

n

i

x

i

m

d

u

e

l

A

Inner

Washer

Grinding Wheel

M

P

R

0

5

1

Outer Washer

Figure 21. Assembly order for wheel installation.

6.

While standing away from line of rotation, turn

sharpener ON and run new grinding wheel for
at least 1–2 minutes before standing in front
of it. This helps protect you if wheel has inter­nal damage that will cause it to fly apart from
centrifugal force of rotation.

— If sharpener runs smoothly, grinding wheel

may now be used.

-22-

Model T32720 (Mfd. Since 06/21)

— If wheel appears to wobble excessive-

ly, sharpener vibrates excessively, or
any other unsafe condition appears with
new wheel, stop sharpener and refer to

Troubleshooting on Page 29.

Grinding Wheel

Rotation

The tool rest can be attached in two positions,
allowing for grinding with or against the rotation
direction of the grinding wheel.

Working with the grinding wheel rotation yields
more precise results and removes less material.
Use this method for finer tools, such as knives or
carving tools.

Working against the grinding wheel rotation
removes large amounts of material quickly but
does not yield precise results. Use this method for
coarse tools such as axes.

Connect machine to power.

4.

5. Rest workpiece against tool rest with sharp-

ened edge pointing away from you (see
Figure 23).

Perform grinding operation on grinding area

6.
indicated in Figure 23.

Figure 23. Example of properly grinding against

wheel rotation.

Grinding Against Wheel Rotation

1. DISCONNECT MACHINE FROM POWER!

2. Position machine so ON/OFF switch faces

towards you.

Install tool rest in vertical mounts shown in

3.
Figure 22. Be sure rest is secure and will not

move while grinding.

Tool Rest

Vertical Mount

(1 of 2)

Grinding With Wheel Rotation

1. DISCONNECT MACHINE FROM POWER!

2. Position machine so ON/OFF switch faces

away from you.

Install tool rest in horizontal mounts shown in

3.
Figure 24. Be sure rest is secure and will not

move while grinding.

Horizontal Mounts

Tool Rest

Figure 22. Tool rest installed in vertical mounts.

Model T32720 (Mfd. Since 06/21)

Figure 24. Tool rest installed in horizontal

mounts.

4. Connect machine to power.

-23-

Rest workpiece against tool rest with sharp-

5.

ened edge pointing away from you (see

Figure 25).

To prepare stropping wheel:

DISCONNECT MACHINE FROM POWER!

1.

Perform grinding operation on grinding area

6.
indicated in Figure 25.

Figure 25. Example of properly grinding with

wheel rotation.

Preparing

2. Install tool rest in horizontal mounts as shown

in Figure 26.

Horizontal Mounts

Tool Rest

Figure 26. Tool rest installed in horizontal

mounts.

3. Evenly apply light machine oil to leather
wheel. Wheel should be coated but not
dripping.

Stropping Wheel

The leather stropping wheel on the Model T32720
can be used to obtain a razor sharp edge on
many tools. Before use, the stropping wheel must
be properly prepared to obtain the best results
and prevent the wheel from wearing prematurely.

Items Needed Qty

Light Machine Oil............................... As Needed

Abrasive Stropping Paste

.................. As Needed

Apply thin coat of abrasive honing paste to

4.

leather wheel. Turn wheel by hand while
applying to distribute.

Connect machine to power.

5.

6. Turn machine ON and distribute paste until

even.

Perform stropping operation.

7.

Note: Repeat this procedure whenever you

notice a drop in sharpening performance of
the stropping wheel.

-24-

Model T32720 (Mfd. Since 06/21)

Replacing

Stropping Wheel

A damaged stropping wheel does not pose the
same dangers as a grinding wheel, but replace it
if it is torn or you notice a marked change in your
sharpening results.

To replace stropping wheel:

DISCONNECT MACHINE FROM POWER!

1.

2. Remove arbor lock knob (see Figure 27).

3. Remove stropping wheel arbor hex nut and

flat washer (see Figure 28).

Tip: Hold grinding wheel with free hand to

stop it from turning while loosening lock knob.

Arbor

Lock Knob

Figure 27. Location of arbor lock knob.

Figure 28. Location of arbor hex nut and flat

washer.

4. Remove old stropping wheel.

Note: Stropping wheel is composed of two

plastic discs that fit together. Remove both of
these components together.

Mount new stropping wheel, taking care to

5.

keep arbor pin seated in spindle, as shown in
Figure 29. Stropping wheel will not fully seat
if pin is not in place.

Model T32720 (Mfd. Since 06/21)

Arbor Pin

Figure 29. Arbor pin properly seated in spindle.

6.

Install arbor flat washer, hex nut, and lock

knob.

-25-

ACCESSORIES

Installing unapproved accessories may

order online at www.grizzly.com or call 1-800-523-4777

SECTION 5: ACCESSORIES

cause machine to malfunction, resulting in
serious personal injury or machine damage.
To reduce this risk, only install accessories
recommended for this machine by Grizzly.

NOTICE

Refer to our website or latest catalog for
additional recommended accessories.

Basic Eye Protection

T32323—Woodturners Face Shield
T32401—EDGE Brazeau Safety Glasses, Clear
T32402—EDGE Khor G2 Safety Glasses, Tint
T32404—EDGE Mazeno Safety Glasses, Clear

T32795—Shears Sharpening Jig

Install the tool rest in the vertical position to use
this jig to sharpen the beveled edges of scissors.

Figure 31. Model T32795 Shears Sharpening

Jig.

T32323 T32401

T32402

Figure 30. Assortment of basic eye protection.

T32404

T32796—Large Knife Sharpening Jig

Mount this jig on the tool rest in the horizontal
position to clamp knives 4" or longer for easy
grinding.

Figure 32. Model T32796 Large Knife

Sharpening Jig.

-26-

Model T32720 (Mfd. Since 06/21)

order online at www.grizzly.com or call 1-800-523-4777

T32797—Small Knife Sharpening Jig

Mount this jig on the tool rest in the horizontal posi­tion to clamp knives 4" or less for easy grinding.

Figure 33. Model T32797 Small Knife

Sharpening Jig.

T32799—Dressing Stone

This stone dresser can be used to clean grinding
wheels when loaded with metal fillings. The fine­grained side will adjust the Model T32720 wheel
grit to approximately 1000 while the course­grained side will return it to approximately 220.

T32798—Axe Sharpening Jig

Grind axes against wheel rotation with this jig.

Figure 34. Model T32798 Axe Sharpening Jig.

T32845—Replacement Stropping Wheel

Overall dimensions are 200mm in diameter by
30mm wide.

Figure 36. Model T32799 Dressing Stone.

T32844—Replacement Grinding Wheel

Direct replacement for the T32720 10" Variable­Speed Wet Sharpener. The 2

1

⁄2 " wide, 220-grit
aluminum oxide grinding wheel is specially made
for wet sharpening.

Figure 37. Model T32844 Grinding Wheel.

Figure 35. Model T32845 Stropping Wheel.

Model T32720 (Mfd. Since 06/21)

-27-

SECTION 6: MAINTENANCE

Maintaining

To reduce risk of shock or
accidental startup, always
disconnect machine from
power before adjustments,
maintenance, or service.

Schedule

For optimum performance from this machine, this
maintenance schedule must be strictly followed.

Ongoing

To minimize your risk of injury and maintain proper
machine operation, shut down the machine imme­diately if you ever observe any of the items below,
and fix the problem before continuing operations:

Damaged grinding or stropping wheel.

•
Worn or damaged wires.

•
Any other unsafe condition.

•

Grinding Wheel

Grinding wheels can be easily damaged, so it is
important to store them properly. Follow all wheel
manufacturer storage instructions. Always store
grinding wheels in a location that is dry and pro­tected from potential damage due to them being
dropped or having other items dropped on them.
Also, avoid storing grinding wheels where there is
high humidity, extreme heat or cold, or solvents.

Depending on the type of grinding you do, the
grinding wheel may require periodic dressing.
New wheels are often out-of-round and require
truing. A wheel can become grooved or glazed if
it is not trued before use.

There are several different types of wheel dress­ing devices available on the market (see Page 27
for an example). Dressing restores the abrasive
quality of the wheel surface and brings the wheel
edge back to a square form.

Cleaning

Clean water reservoir and area under machine
after every use to prevent sediment build up and
rust. Use a rag and wear gloves to protect your
hands from any sharp metal pieces.

Refer to the instructions that accompany your
dressing accessory for complete details on how
to properly dress the wheel.

-28-

Model T32720 (Mfd. Since 06/21)

Review the troubleshooting procedures in this section if a problem develops with your machine. If you need

the

serial number and manufacture date of your machine before calling.

SECTION 7: SERVICE

replacement parts or additional help with a procedure, call our Technical Support. Note: Please gather

Troubleshooting

Motor & Electrical

Symptom Possible Cause Possible Solution

Machine does
not start, or
power supply
breaker
immediately
trips after
startup.

Machine
stalls or is
underpowered.

Machine has
vibration or
noisy operation.

1. Switch disabling key removed.

2. Incorrect power supply voltage or circuit size.

3. Power supply circuit breaker tripped or fuse
blown.

4. Wiring broken, disconnected, or corroded.

5. Motor brushes worn out.

6. ON/OFF switch at fault.

7. Variable-speed dial/potentiometer at fault.

8. Blown fuse on circuit board or circuit board at
fault.

9. Motor or motor bearings at fault.

1. Operator using too much pressure.

2. Wrong workpiece material.

3. Blown fuse on circuit board or circuit board at
fault.

4. Variable-speed dial/potentiometer at fault.

5. Motor brushes worn out.

6. Machine undersized for task.

7. Motor overheated.

8. Extension cord too long.

9. Motor or motor bearings at fault.

1. Machine not placed on flat surface.

2. Grinding wheel dressed incorrectly.

3. Grinding wheel is water-logged.

4. Motor or component loose.

5. Grinding wheel at fault/arbor hole not round.

6. Motor mount loose/broken.

7. Workpiece loose.

8. Motor shaft bent.

9. Motor bearings at fault.

1. Install switch disabling key.

2. Ensure correct power supply voltage and circuit size
(Page 10).

3. Ensure circuit is free of shorts. Reset circuit breaker or
replace fuse.

4. Fix broken wires or disconnected/corroded
connections.

5. Replace brushes (Page 31).

6. Replace switch.

7. Replace.

8. Inspect/replace circuit board if at fault.

9. Replace motor.

1. Use less pressure when grinding or stropping.

2. Use correct type/size of material (Page 17).

3. Inspect/replace circuit board if at fault.

4. Test/replace dial/potentiometer.

5. Replace brushes (Page 31).

6. Use new grinding wheel; reduce workpiece pressure.

7. Clean motor, let cool, and reduce workload.

8. Move machine closer to power supply; use shorter
extension cord.

9. Replace motor.

1. Make sure machine is placed on a solid, flat surface.

2. Re-dress wheel (Page 28).

3. Allow wheel to dry, then inspect wheel (Page 19) Do
not leave wheel immersed in water when not in use.
Replace wheel if needed (Page 22).

4. Replace damaged or missing bolts/nuts or tighten if
loose.

5. Dress (Page 28)/replace (Page 22) grinding wheel.

6. Tighten/replace.

7. Use the correct holding fixture and reclamp the
workpiece.

8. Test with dial indicator and replace motor.

9. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.

Model T32720 (Mfd. Since 06/21)

-29-

Operation

Symptom Possible Cause Possible Solution

Machine slows when

operating.

Grinding wheel slips
during rotation.

Wavy condition
on surface of
workpiece.

Lines on surface of
workpiece.

Grinding wheel dulls
quickly, grit falls off.

Grinding wheel
clogs.

Stropping wheel
loses performance.

1. Operator using too much pressure.

2. RPM too low.

1. Torque is too low. 1. Increase torque (Page 19).

1. Machine vibrating.

2. Workpiece not being held firmly.

3. Grinding wheel face uneven.

4. Grinding wheel is too hard.

1. Impurity on grinding wheel surface.

2. Workpiece not being held tightly.

3. Grinding wheel dressed incorrectly.

. Operator using too much pressure.

1

2. Wheel is too soft for material being ground.

3. Wheel diameter too small.

4. Wheel dressed incorrectly.

5. Wheel has been stored incorrectly.

6. Wheel is too old.

7. Defective wheel bonding.

1. Wheel dressed incorrectly.

2. Wrong workpiece material.

3. Dirty water in reservoir.

1. Insufficient wheel preparation.

2. Wheel is damaged, worn.

1. Use less pressure when grinding or stropping.

2. Increase RPM.

1. Make sure machine is placed on a solid, flat
surface.

2. Brace workpiece against tool rest or use a holding
device to firmly retain workpiece.

3. Dress grinding wheel (Page 28).

4. Use softer wheel (Page 18)/reduce feed rate.

1. Dress grinding wheel (Page 28).

2. Brace workpiece against tool rest or use a holding
device to firmly retain workpiece.

3. Re-dress wheel (Page 28).

1. Use less pressure when grinding.

2. Use harder bond (Page 18).

3. Replace wheel (Page 22).

4. Re-dress wheel (Page 28).

5. Replace wheel (Page 22). Only store grinding
wheel in a dry place that is not subject to extreme
temperatures (Page 28).

6. Replace wheel (Page 22). Consult manufacturer to
determine wheel shelf life.

7. Consult manufacturer of grinding wheel/replace
wheel (Page 22).

1. Re-dress wheel (Page 28).

2. Use correct type/size of material (Page 17).

3. Empty, clean, and refill reservoir.

1. Prepare wheel correctly (Page 24).

2. Replace wheel (Page 22).

-30-

Model T32720 (Mfd. Since 06/21)

Replacing

Motor Brushes

This sharpener is equipped with a universal motor
that uses two carbon brushes to transmit electri­cal current inside the motor. These brushes are
considered to be regular "wear items" or "con­sumables" that will need to be replaced during
the life of the motor. The frequency of required
replacement is often related to how much the
motor is used and how hard it is pushed.

Replace the carbon brushes at the same time
when the motor no longer reaches full power,
or when the brushes measure less than
(new brushes are

1

⁄2" long).

1

⁄8" long

Remove brush caps and worn brushes from

4.

motor (see Figure 38).

Brush Cap

Figure 38. Location of brush caps and brushes

on motor.

If your machine is used frequently, we recom­mend keeping an extra set of these replacement
brushes on-hand to avoid any downtime.

Items Needed Qty

Dime or Penny ................................................... 1

Pair of Motor Brushes (PT32720044)

To replace motor brushes:

DISCONNECT MACHINE FROM POWER!

1.

2. Remove grinding wheel so it will not be dam-
aged in following steps (refer to Installing/
Removing Grinding Wheel on Page 22).

Turn machine on its side to access inside of

3.

base.

................ 1

5.

Replace both motor brushes and install brush

caps.

Turn machine right-side up.

6.

7. Install grinding wheel if needed for next oper-
ation (refer to Installing/Removing Grinding
Wheel on Page 22).

Model T32720 (Mfd. Since 06/21)

-31-

These pages are current at the time of printing. However, in the spirit of improvement, we may make chang­es to the electrical systems of future machines. Compare the manufacture date of your machine to the one

number and manufacture date of your

machine before calling. This information can be found on the main machine label.

machine

SECTION 8: WIRING

stated in this manual, and study this section carefully.

If there are differences between your machine and what is shown in this section, call Technical Support at
[phone] for assistance BEFORE making any changes to the wiring on your machine. An updated
wiring diagram may be available. Note: Please gather the serial

Wiring Safety Instructions

SHOCK HAZARD. Working on wiring that is con-

nected to a power source is extremely dangerous.
Touching electrified parts will result in personal
injury including but not limited to severe burns,
electrocution, or death. Disconnect the power
from the machine before servicing electrical com­ponents!

MODIFICATIONS. Modifying the wiring beyond
what is shown in the diagram may lead to unpre­dictable results, including serious injury or fire.
This includes the installation of unapproved after­market parts.

WIRE CONNECTIONS. All connections must
be tight to prevent wires from loosening during
machine operation. Double-check all wires dis­connected or connected during any wiring task to
ensure tight connections.

CIRCUIT REQUIREMENTS. You MUST follow
the requirements at the beginning of this manual
when connecting your machine to a power source.

WIRE/COMPONENT DAMAGE. Damaged wires
or components increase the risk of serious per­sonal injury, fire, or machine damage. If you notice
that any wires or components are damaged while
performing a wiring task, replace those wires or
components.

MOTOR WIRING. The motor wiring shown in
these diagrams is current at the time of printing
but may not match your machine. If you find this
to be the case, use the wiring diagram inside the
motor junction box.

CAPACITORS/INVERTERS. Some capacitors
and power inverters store an electrical charge for
up to 10 minutes after being disconnected from
the power source. To reduce the risk of being
shocked, wait at least this long before working on
capacitors.

EXPERIENCING DIFFICULTIES. If you are expe­riencing difficulties understanding the information
included in this section, contact our Technical
Support at [phone].

The photos and diagrams
included in this section are
best viewed in color. You

-32-

can view these pages in
color at www.grizzly.com.

Model T32720 (Mfd. Since 06/21)

Wiring Diagram

CONTROL PANEL BOX

Figure 39. Control panel wiring.

Back

L3

Potentiometer

Fuse

5A 250V

ACL

Front

Circuit Board

CR431V7

120V MOTOR

ON/OFF Switch

KEDU HY18

4

6

1

25

3

Figure 40. Motor and overall wiring.

Hot

Neutral

120 VAC

1-15 Plug

Model T32720 (Mfd. Since 06/21)

READ ELECTRICAL SAFETY

ON PAGE 32!

-33-

SECTION 9: PARTS

We do our best to stock replacement parts when possible, but we cannot guarantee that all parts shown
are available for purchase. Call [phone] or visit www.grizzly.com/parts to check for availability.

Main

46

35

9

11

36

10

40

7

35-5

35-4

35-2

35-4

35-5

35-3

35-2

35-1

41

28

35-6

8

37

30

26

27

26

33

35-1

33

38

25°

40°

25°

25°

35°

40°

30°

35°u. 40°:

40°

30°

40°

20°:

20°

60°

20°

25°

60°

25°

60°

25

5

3

4

6

2

2

1

34

13

14

4

29

12

16

31

24

39

42

32

15

15

18

17

20

21

23

22

19

-34-

BUY PARTS ONLINE AT GRIZZLY.COM !

Scan QR code to visit our Parts Store.

44

45

Model T32720 (Mfd. Since 06/21)

43

REF PART # DES CRIPTI ON REF P ART # DES CRIPTI ON

Main Parts List

1 PT32720001 HEX NUT M12-1.75 27 PT32720027 ADJ USTMENT NUT M1 2-1 . 7 5 KN
2 PT32720002 FLAT WASHER 12MM 28 PT32720028 TOOL REST
3 PT32720003 GRINDING WHEEL TYPE-5 10 X 2-1/2 X 1/2 29 PT32720029 MOTO R TENSI ON NUT M8 -1. 25
4 PT32720004 ARBOR B USHI NG 30 PT32720030 ROLL PIN 5 X 25
5 PT32720005 MACHI NE HOUSI NG 31 PT32720031 MOTOR TE NSI ON CAP
6 PT32720006 GRI NDI NG WHE EL S PINDLE 32 PT32720032 CI RCUI T BO ARD CR431V7
7 PT32720007 DRIVE WHEEL 33 PT32720033 KNOB BOLT M6-1 X 22, 6-LOBE, D30
8 PT32720008 DRIVE WHEEL TI RE 34 PT32720034 STRAIN RELIEF TYPE-1 1/2"
9 PT32720009 STROPPING WHEEL 35 PT32720035 STRAIGHT EDGE SHARPENING JIG
10 PT32720010 FLAT WA SHER 8 MM 35-1 PT32720035-1 PLASTIC BUSHING
11 PT32720011 KNOB M8-1.25, 9-LOBE, D50 35-2 PT32720035-2 CONICAL COMP SPRING 0.8 X 8 X 13, 13OD
12 PT32720012 SWI TCH BOX 35-3 PT32720035-3 CLAMP PLATE
13 PT32720013 ON/ OFF SWI TCH KE DU HY18 35-4 PT32720035-4 FLAT WAS HER 6MM
14 PT32720014 CONTROL PANEL 35-5 PT32720035-5 KNOB BOLT M6-1 X 20, 6-LOBE, D30
15 PT32720015 TAP SCREW M4.2 X 16 35-6 PT32720035-6 BASE PLATE
16 PT32720016 STRAIN RELIEF TYPE-3 PG9 36 PT32720036 HEX NUT M8-1 . 2 5 THI N
17 PT32720017 RUBBER FOOT 37 PT32720037 FLAT WASHER 12MM
18 PT32720018 POWER CORD 18G 2W 78" 1-15P 38 PT32720038 ANGLE GUIDE
19 PT32720019 MOTOR 80W 120V 1-PH 39 PT32720039 CRI MP CONNECTO R 7. 6 X 1 7.5MM
20 PT32720020 MOTOR PIVOT SHAFT 40 PT32720040 TAP SCREW M4.2 X 8
21 PT32720021 E-CLIP 10MM 41 PT32720041 DRIVE WHEEL COVER
22 PT32720022 COMPRESSION SPRING 1.2 X 13.4 X 75 42 PT32720042 TAP SCREW M4 X 14
23 PT32720023 EXT RE TAI NI NG RI NG 10MM 43 PT32720043 VARIABLE-SPEED DIAL
24 PT32720024 WATER RESERVOIR 44 PT32720044 CARBON BRUSHES (PAIR)
25 PT32720025 KNOB BOLT M8-1.25 X 45, 9-LOBE, D35 45 PT32720045 BRUSH CAP
26 PT32720026 LOCK COLLAR 46 PT32720046 ABRASIVE STROPPING PASTE

Model T32720 (Mfd. Since 06/21)

BUY PARTS ONLINE AT GRIZZLY.COM !

Scan QR code to visit our Parts Store.

-35-

Labels & Cosmetics

REF PART # DESCRIP TION REF PART # DESCRIP TION

101

Specifications

Motor: 80W, 120V, 1-Ph, 60 Hz
Full-Load Current Rating: 1.4A
Grinding Wheel: 10" x 2-1/2"
Stropping Wheel: 8-7/8" x 1-3/16"

Wheel Bore: 1/2"
Spindle Speed: 90–150 RPM
Min. Wheel Speed Rating: 150 RPM
Weight: 26 lbs.

102

Mfd. for Grizzly in China

T32720

Date

S/N

104

WARNING!

To reduce risk of death
or serious injury, read
manual BEFORE using
machine.

To get a new manual, call
[phone] or go to
www.grizzly.com.

WARNING!

EYE/LUNG INJURY

Always wear safety
glasses and a
respirator when
using this machine.

WARNING!

ENTANGLEMENT

Tie back long hair, roll up
long sleeves, and remove
loose clothing, jewelry, or
gloves to prevent getting
caught in moving parts.

HAZARD!

HAZARD!

10"

105

220-Grit Grinding Wheel

WET GRINDING ONLY
ARBOR DIAMETER: ½"

MAXIMUM RPM: 150 RPM

103

T

S

E
T

T

E

S

E

R

WARNING!

Drip Loop

ELECTROCUTION

HAZARD!
Ensure power cord
always has a "drip
loop" to prevent
water from running
into power supply!

receptacle!
GFCI-protected
power cord to
Only connect this

HAZARD!

ELECTROCUTION

Outlet

Ground Fault

WARNING!

To reduce the risk of serious injury while using this machine:

1. Read and understand owner’s manual before operating.

2. Always wear approved eye protection and respirator.

3. Tie back long hair, roll up sleeves, and DO NOT wear loose clothing, gloves, or jewelry.

4. Only connect power cord to grounded GFCI outlet.

5. Only use grinding wheels suitable for maximum speed of grinder.

6. Always use tool rest and hold workpiece firmly with both hands when grinding.

7. Stand to side of sharpener during start-up.

8. Never use damaged grinding wheel. Inspect and test to ensure wheel is free
from cracks and defects.

9. Disconnect power before changing wheels, adjusting, or servicing.

10. DO NOT expose to rain or use in wet location.

11. DO NOT operate under influence of drugs or alcohol or when tired.

12. Prevent unauthorized use by children or untrained users;

restrict access or disable machine when unattended.

WARNING!

109

M

P

R

0

9

M

P

R

0

5

1

108

1

2

0

107

R

P

M

106

T32720

101 PT32720101 SPECIFICATIONS LABEL 106 PT32720106 QR CODE LABEL
102 PT32720102 SERIAL NUMBER LABEL 107 PT32720107 ELECTRICITY LABEL
103 PT32720103 DRIP LOOP/ GFCI LABEL 108 PT32720108 RPM LABEL
104 PT32720104 COMBO WARNING LABEL 109 PT32720109 MACHI NE WA RNI NG LABEL
105 PT32720105 GRINDING WHEEL LABEL/BLOTTER

Safety labels help reduce the risk of serious injury caused by machine hazards. If any label comes
off or becomes unreadable, the owner of this machine MUST replace it in the original location
before resuming operations. For replacements, contact [phone] or www.grizzly.com.

-36-

BUY PARTS ONLINE AT GRIZZLY.COM !

Scan QR code to visit our Parts Store.

Model T32720 (Mfd. Since 06/21)

WARRANTY & RETURNS

Grizzly Industrial, Inc. warrants every product it sells for a period of 1 year to the original purchaser from
the date of purchase. This warranty does not apply to defects due directly or indirectly to misuse, abuse,
negligence, accidents, repairs or alterations or lack of maintenance. This is Grizzly’s sole written warranty
and any and all warranties that may be implied by law, including any merchantability or fitness, for any par­ticular purpose, are hereby limited to the duration of this written warranty. We do not warrant or represent
that the merchandise complies with the provisions of any law or acts unless the manufacturer so warrants.
In no event shall Grizzly’s liability under this warranty exceed the purchase price paid for the product and
any legal actions brought against Grizzly shall be tried in the State of Washington, County of Whatcom.

We shall in no event be liable for death, injuries to persons or property or for incidental, contingent, special,
or consequential damages arising from the use of our products.

The manufacturers reserve the right to change specifications at any time because they constantly strive to
achieve better quality equipment. We make every effort to ensure that our products meet high quality and
durability standards and we hope you never need to use this warranty.

In the event you need to use this warranty, contact us by mail or phone and give us all the details. We will
then issue you a “Return Number,’’ which must be clearly posted on the outside as well as the inside of
the carton. We will not accept any item back without this number. Proof of purchase must accompany the
merchandise.

Please feel free to write or call us if you have any questions about the machine or the manual.

Thank you again for your business and continued support. We hope to serve you again soon.

To
you can
applicable information for

take advantage of this warranty, you must register it at https://www.grizzly.com/forms/warranty, or

scan the QR code below to be automatically directed to our warranty registration page. Enter all

the product.

WARRANTY