Operating Instructions and Parts Manual
2 x 72-inch Square Wheel Belt Grinder
Model SWG-272, SWG-272VS
Variable speed model
Single speed model
shown with platen assembly
JET
427 New Sanford Road
LaVergne, Tennessee 37086 Part No. M-577400
Ph.: 800-274-6848 Edition 2 02/2021
www.jettools.com Copyright © 2020 JET
1.0 IMPORTANT SAFETY
INSTRUCTIONS
- Misuse of this machine can cause serious injury.
- For safety, machine must be set up, used and
serviced properly.
- Read, understand and follow instructions in the
operator’s manual and all labels affixed to the
machine.
When setting up machine:
- Always avoid using machine in damp or poorly
lighted work areas.
- Always be sure machine is securely anchored to
the floor or bench.
- Always keep machine guards in place.
- Always put start switch in OFF position before
plugging in machine.
When using machine:
- Never operate with machine guards missing.
- Always wear safety glasses with side shields (See
ANSI Z87.1)
- Never wear loose clothing or jewelry.
- Never overreach ⎯ you may slip and fall into the
machine.
- Never leave machine running while you are away
from it.
- Always shut off the machine when not in use.
When servicing machine:
- Always unplug machine from electrical power while
servicing.
- Always follow instructions in operators and parts
manual when changing accessory tools or parts.
- Never modify the machine without consulting JET.
1.1 Machinery general safety
warnings
1. Always wear protective eye wear when
operating machinery. Eye wear shall be impact
resistant, protective safety glasses with side
shields which comply with ANSI Z87.1
specifications. Use of eye wear which does not
comply with ANSI Z87.1 specifications could
result in severe injury from the breakage of the
eye protection.
2. Wear proper apparel. No loose clothing or
jewelry which can get caught in moving parts.
Contain long hair. Rubber soled, nonslip
footwear is recommended for best footing.
3. Do not overreach. Failure to maintain a proper
working position can cause you to fall into the
machine or cause your clothing to get caught —
pulling you into the machine.
4. Keep guards in place and in proper working
order. Do not operate the machine with the
guards removed.
5. Avoid dangerous working environments. Do not
use stationary machine tools in wet or damp
locations. Keep work areas clean and well lit.
6. Avoid accidental starts by being sure that the
start switch is in the “OFF” position before
plugging in the machine.
7. Never leave the machine running while
unattended. The machine shall be shut off
whenever it is not being used.
8. Disconnect the electrical power before
servicing, whenever changing accessories or
when general maintenance is done on the
machine.
9. Maintain all machine tools with care. Follow all
maintenance instructions for lubricating and the
changing of accessories. No attempt shall be
made to modify or have makeshift repairs done
to the machine. This not only voids the warranty
but also renders the machine unsafe.
10. If there is any risk of tipping or sliding, the
machinery must be anchored to the floor.
11. Secure your work. Use clamps or a vise to hold
your work, when practical. It is safer than using
your hands and it frees both hands to operate
the machine.
12. Never brush chips away while the machine is in
operation.
13. Keep work area clean. Cluttered areas invite
accidents.
14. Remove adjusting keys and wrenches before
turning the machine on.
15. Use the right tool. Don’t force a tool or
attachment to do a job for which it was not
designed.
16. Use only recommended accessories and follow
manufacturer’s instructions pertaining to them.
17. Keep hands in sight and clear of all moving
parts and cutting surfaces.
18. All visitors should be kept at a safe distance
from the work area. Make your workshop
completely safe by using padlocks, master
switches, or by removing starter keys.
19. Know the tool you are using; its application,
limitations, and potential hazards.
20. This machine must be grounded in accordance
with the National Electrical Code and local
codes and ordinances. The work should be
done by a qualified electrician. The machine
should be grounded to protect the user from
electrical shock.
1.2 Safety requirements for abrasive
grinding machines
Abrasive grinding can be hazardous to operators
and bystanders. Grinding sparks, chips and dust
particles thrown off by the grinding disc or belt can
cause serious injury by contact or inhalation. To
avoid such injuries you must comply with the
following safety requirements:
1. Always wear protective eyewear when
operating machinery. Eye wear shall be impact
resistant, protective safety glasses with side
shields which comply with ANSI Z87.1.
2. Wear leather safety gloves, arm guards, leather
aprons and safety shoes.
3. A dust collection system is recommended,
Operator shall also wear a dust mask at all
times. See Figure B, below.
4. Additional precautions may be necessary for
grinding materials which are flammable or have
other hazardous properties. You should always
consult the manufacturer of such materials for
instructions on grinding and handling.
5. Do not force or jamb the workpiece into the
grinding disc/belt.
6. Before grinding, always allow the motor to come
up to operating speed, then check the grinding
disc for wobble, runout, or any unbalanced
condition. If the disc is not operating accurately
and smoothly, immediately stop the motor and
make repairs before attempting any grinding
operations.
7. Abrasives must be stored in a controlled
environment area. Relative humidity should be
35% to 50% and the temperature should be
between 60 and 80 degrees Fahrenheit.
Failure to do so could cause premature
abrasive failure.
8. Examine the face of the grinding disc/belt
carefully. Excessive grinding which wears down
to the backing material can tear the abrasive.
9. Never use an abrasive which shows backing,
nicks or cuts on the surface or edge or damage
due to creasing or poor handling.
10. Always present the workpiece to the wheel
while resting the workpiece firmly on the table.
Failure to do so could result in damage to the
workpiece or throwing of the workpiece off the
wheel.
11. Safety shoes which comply with ANSI Z41.1
shall be worn. See Figure C.
12. Personal hearing protection such as ear plugs
or ear muffs shall be used to protect against the
effect of noise exposure. See Figure D.
WARNING: This product can expose you to
chemicals including lead which is known to the
State of California to cause cancer and birth
defects or other reproductive harm. For more
information go to http://www.p65warnings.ca.
gov.
WARNING: Some dust, fumes and gases
created by power sanding, sawing, grinding,
drilling, welding and other construction activities
contain chemicals known to the State of
California to cause cancer and birth defects or
other reproductive harm. Some examples of
these chemicals are:
lead from lead based paint
crystalline silica from bricks, cement and
other masonry products
arsenic and chromium from chemically
treated lumber
Your risk of exposure varies, depending on how
often you do this type of work. To reduce your
exposure to these chemicals, work in a wellventilated area and work with approved safety
equipment, such as dust masks that are
specifically designed to filter out microscopic
particles. For more information go to
http://www.p65warnings.ca.gov/ and http://www.
p65warnings.ca.gov/wood.
Familiarize yourself with the following safety notices used in this manual:
This means that if precautions are
not heeded, it may result in minor injury and/or
possible machine damage.
not heeded, it may result in serious, or possibly even
fatal, injury.
3
This means that if precautions are
2.0 About this machine and manual
The JET SWG-series Square Wheel Belt Grinders are designed for grinding, deburring, chamfering, and
internal/external grinding of small and large parts. The Grinders can be used to polish or buff finished parts and
grind small internal radii using available accessories. Accessory changeover is quick and easy. Belt tension and
tracking are easily adjustable.
This manual is provided by JET, covering the safe operation and maintenance procedures for a JET Model SWGseries Square Wheel Belt Grinder. This manual contains instructions on installation, safety precautions, general
operating procedures, maintenance instructions and parts breakdown. Your machine has been designed and
constructed to provide consistent, long-term operation if used in accordan`ce with the instructions set forth in this
document.
This document is not, however, intended to be an exhaustive guide to grinding operations or choice of metal
stock. Consult machinery handbooks, web forums, or experienced users if additional information is needed.
Safety of user and bystanders must always be first priority.
If there are questions or comments, please contact your local supplier or JET. JET can also be reached at our
web site: www.jettools.com.
Retain this manual for future reference. If the machine transfers ownership, the manual should accompany it.
Read and understand the entire contents of this manual before attempting assembly or
operation. Failure to comply may cause serious injury.
Register your product using the mail-in card provided, or register online:
http://www.jettools.com/us/en/service-and-support/product-registration/
4
3.0 Table of contents
Section Page
1.0 IMPORTANT SAFETY INSTRUCTIONS ....................................................................................................... 2
1.1 Machinery general safety warnings ............................................................................................................ 2
1.2 Safety requirements for abrasive grinding machines ................................................................................. 3
2.0 About this machine and manual ..................................................................................................................... 4
3.0 Table of contents ............................................................................................................................................ 5
4.0 Specifications for SWG-series Grinders ......................................................................................................... 6
4.1 Hole spacing, SWG-272 / -272VS .............................................................................................................. 7
5.0 Setup and assembly ....................................................................................................................................... 8
5.1 Contents of carton ...................................................................................................................................... 8
5.1 Location ...................................................................................................................................................... 8
5.2 Installing work rest ...................................................................................................................................... 8
5.3 Installing dust hood .................................................................................................................................... 8
6.0 Electrical connections .................................................................................................................................... 9
6.1 GROUNDING INSTRUCTIONS ................................................................................................................. 9
6.2 Voltage conversion ..................................................................................................................................... 9
6.3 Extension cords ........................................................................................................................................ 10
7.0 Adjustments ................................................................................................................................................. 10
7.1 Platen or Wheel installation ...................................................................................................................... 10
7.2 Platen wheel adjustment .......................................................................................................................... 10
7.3 Installing/replacing grinding belt ............................................................................................................... 11
7.4 Belt tracking .............................................................................................................................................. 11
8.0 Operation ..................................................................................................................................................... 12
8.1 Controls .................................................................................................................................................... 12
8.2 Typical uses for the Square Wheel Belt Grinder ...................................................................................... 13
9.0 User-maintenance ........................................................................................................................................ 14
9.1 Cleaning ................................................................................................................................................... 14
9.2 Lubrication ................................................................................................................................................ 14
9.3 Contact wheel replacement ...................................................................................................................... 14
9.4 Additional servicing .................................................................................................................................. 14
10.0 Optional accessories .................................................................................................................................. 14
11.0 Troubleshooting SWG-series Square Wheel Grinders .............................................................................. 15
12.0 Replacement Parts ..................................................................................................................................... 15
12.1.1 SWG-272 Square Wheel Belt Grinder – Exploded View ..................................................................... 16
12.1.2 SWG-272 Square Wheel Belt Grinder – Parts List .............................................................................. 17
12.2.1 SWG-272 Motor Assembly – Parts List and Exploded View ............................................................... 18
12.3.1 SWG-272 Push Button Switch Assembly – Parts List and Exploded View ......................................... 19
12.4.1 SWG-272VS Square Wheel Belt Grinder – Exploded View ................................................................ 20
12.4.2 SWG-272VS Square Wheel Belt Grinder – Parts List ......................................................................... 21
12.5 SWG-272VS Motor Assembly – Parts List and Exploded View ............................................................. 22
12.6 SWG-272VS Control Switch Assembly – Parts List and Exploded View ............................................... 23
12.7 Idler Housing Casting Assembly (all models) – Parts List and Exploded View ...................................... 24
12.8 Platen Assembly (all models) – Parts List and Exploded View .............................................................. 25
12.9 Contact Wheel Assembly (all models) – Parts List and Exploded View ................................................. 26
12.10 Dust Hood Assembly (all models) – Parts List and Exploded View ..................................................... 27
13.0 Electrical Connections ................................................................................................................................ 28
13.1 Wiring diagram for SWG-272 ................................................................................................................. 28
13.2 Wiring diagram for SWG-272VS ............................................................................................................ 28
14.0 Warranty and Service ................................................................................................................................. 29
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4.0 Specifications for SWG-series Grinders
Table 1
Model number
SWG-272 SWG-272VS
Stock number 577400 577405
Motor and Electricals
Motor type Totally enclosed industrial Totally enclosed fan cooled, inverter
Horsepower 1 HP
Motor phase Single
(but single phase input to inverter)
3 phase motor
Motor voltage 115/230 V (prewired 115V)
Cycle 60 Hz
Listed FLA (full load amps) 11 / 5.5 A 13 / 6.5 A
Motor speed 1,750 RPM 1800 RPM
Start capacitor 400MFD 125VAC n/a
Run capacitor
45F 350VAC
n/a
Power transfer Direct drive
On/off switch
Push button w/ power indicator
and safety key
Toggle switch with safety cover;
Membrane switch inverter panel
Power cord SJT 16AWGx3C, 6 ft.
Power plug 5-15P, 125V/15A installed
Recommended circuit size 1 15 A
Sound emission 2 80 dB at 3ft. without load
Base
Footprint, L x W 35-7/16 x 16-15/16 in. (900 x 430 mm)
Mounting hole dimensions Dia. 7/16 in. (11mm)
Belt Grinder
Belt included, L x W 50 grit; 72 x 2 in. (1829 x 50.8 mm)
Belt speed, SFPM 4,600 2,000~6,200
Contact wheels included, Dia. x W 1-1/2 x 2 in. (38 x 50.8 mm) smooth
3 x 2 in. (76.2 x 50.8 mm) smooth
8 x 2 in. (203.2 x 50.8 mm) serrated
Dust port diameter 3 in. (76.2 mm)
Main materials
Frame Steel
Contact wheel, 8-inch Rubber, 90 Durometer
Contact wheel, 3 x 2-inch Rubber, 70 Durometer
Contact wheel, 1.5 x 2-inch Rubber, 70 Durometer
Idler wheel Rubber
Drive wheel Aluminum
Platen Steel
Head casting Cast iron
Dimensions
Overall dimensions L x W x H 35-7/16 x 17 x 21-1/4 in.
(900 x 433 x 540 mm)
35-7/16 x 17 x 21-27/32 in.
(900 x 433 x 555 mm)
Shipping dimensions L x W x H 34-1/4 x 21-1/4 x 22-7/16 in. (870 x 540 x 570 mm)
Weights
Net weight 126 lb. (57.27 kg) 131 lb. (59.54 kg)
Shipping weight 162 lb. (73.64 kg) 167 lb. (75.90 kg)
6
1
subject to local/national electrical codes.
2
The specified values are emission levels and are not necessarily to be seen as safe operating levels. As workplace
conditions vary, this information is intended to allow the user to make a better estimation of the hazards and risks
involved only.
L = length, W = width, H = height, Dia. = diameter
The specifications in this manual were current at time of publication, but because of our policy of continuous
improvement, JET reserves the right to change specifications at any time and without prior notice, without incurring
obligations.
4.1 Hole spacing, SWG-272 / -272VS
All dimensions millimeters
Figure 4-1
7
Read and understand all
assembly instructions before attempting
assembly. Failure to comply may cause serious
injury.
Note: Some illustrations in this manual may be
representative only, and not show your specific
model.
5.0 Setup and assembly
5.1 Contents of carton
1 Grinder
1 Serrated contact wheel 8”x2” (installed)
1 Abrasive belt (installed)
1 Operating Instructions and Parts Manual
1 Product registration card
Uninstalled accessories (Figure 5-1):
1 Work rest
1 Adjustable handle 3/8x3/4”
1 Flat washer 3/8”
1 Platen assembly
1 Rail
1 Channel slide
2 Hand knobs 5/16x1
2 Socket hd cap screws 1/4x1/2
2 Lock washers 1/4
1 Dust hood
5.1 Location
It is strongly recommended that the machine be
secured to a bench or stand. The base has multiple
holes (some are accessed behind the side panel) to
accept fasteners for this purpose. Sect. 4.1 shows
the hole patterns.
An optional JET stand is available for this machine.
See sect. 10.0. Use the 4 holes in front of the motor
to secure to this stand.
5.2 Installing work rest
The work rest mounts to a channel on left side of
head casting. See Figure 5-2. Attach work rest with
adjustable handle. Slide work rest inward until it is
about 1/16 inch from front of contact wheel. Tighten
cap screw.
5.3 Installing dust hood
It is recommended that the dust hood be used, and
connected to a metal dust collection system by a 3inch diameter hose secured with a hose clamp (not
provided).
Assemble dust hood parts as shown in Figure 5-2.
Also, secure the rail below the stand using the 2
socket head screws with lock washers (A, Figure 5-
2). Slide the dust hood assembly onto the rail and
tighten with the knobs.
The dust hood can be positioned as needed below
the contact wheel.
Figure 5-1: contents (not to scale)
Figure 5-2: work rest and dust hood
8
6.0 Electrical connections
Electrical connections must be
made by a qualified electrician in compliance
with all relevant codes. This machine must be
properly grounded to help prevent electrical
shock and possible fatal injury.
The SWG-272 and 272VS Square Wheel Grinder is
pre-wired for 115V power. It may be converted to
230V power; see sect. 6.2.
It is recommended that the grinder be connected to
a dedicated minimum 15-amp circuit with circuit
breaker or fuse. If connected to a circuit protected
by fuses, use time-delay fuse marked “D”. Local
codes take precedence over recommendations.
6.1 GROUNDING INSTRUCTIONS
1. All Grounded, Cord-connected Tools:
This machine must be grounded. In the event of a
malfunction or breakdown, grounding provides a
path of least resistance for electric current to reduce
the risk of electric shock. This tool is equipped with
an electric cord having an equipment-grounding
conductor and a grounding plug. The plug must be
plugged into a matching outlet that is properly
installed and grounded in accordance with all local
codes and ordinances.
Do not modify the plug provided - if it will not fit the
outlet, have the proper outlet installed by a qualified
electrician.
Improper connection of the equipment-grounding
conductor can result in a risk of electric shock. The
conductor with insulation having an outer surface
that is green with or without yellow stripes is the
equipment-grounding conductor. If repair or
replacement of the electric cord or plug is
necessary, do not connect the equipment-grounding
conductor to a live terminal.
Before connecting to power source, be sure the
switch is in off position.
Check with a qualified
electrician or service personnel if the grounding
instructions are not completely understood, or if
in doubt as to whether the tool is properly
grounded. Failure to comply may cause serious
or fatal injury.
Use only 3-wire extension cords that have 3-prong
grounding plugs and 3-pole receptacles that accept
the tool's plug.
Repair or replace damaged or worn cord
immediately.
2. Grounded, cord-connected tools intended for use
on a supply circuit having a nominal rating less than
150 volts:
This tool is intended for use on a circuit that has an
outlet that looks like the one illustrated in A, Figure
6-1. An adapter, shown in B and C, may be used to
connect this plug to a 2-pole receptacle as shown in
B if a properly grounded outlet is not available. The
temporary adapter should be used only until a
properly grounded. The green-colored rigid ear, lug,
and the like, extending from the adapter must be
connected to a permanent ground such as a
properly grounded outlet box.
In Canada, the use of a temporary adaptor is not
permitted by the Canadian Electrical Code, C22.1.
3. Grounded, cord-connected tools intended for use
on a supply circuit having a nominal rating between
150 - 250 volts, inclusive:
This tool is intended for use on a circuit that has an
outlet that looks like the one illustrated in D, Figure
6-1. The tool is intended to be used with a grounding
plug that looks like the plug illustrated in D. Make
sure the tool is connected to an outlet having the
same configuration as the plug. No adapter is
available or should be used with this tool. If the tool
must be reconnected for use on a different type of
electric circuit, the reconnection should be made by
qualified service personnel; and after reconnection,
the tool should comply with all local codes and
ordinances.
Figure 6-1
6.2 Voltage conversion
The grinder is prewired for 115 volt input power, but
can be converted to 230 volt input, as follows.
6.2.1 Single speed model (SWG-272)
1. Open motor junction box cover, and reconnect
the leads according to diagram inside cover.
See sect. 14.0 for similar diagram. (Note: In
case of discrepancy, diagram on junction cover
takes precedence.)
2. Remove existing plug from power cable and
attach a UL/CSA listed plug designed for 230V
power; or “hardwire” the machine directly to a
panel. If hardwiring make sure a disconnect is
provided for the operator.
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