JET 414550K User Manual
Operating Instructions and Parts Manual
Belt and Disc Sanding Machine
Model J-4210
WALTER MEIER (Manufacturing) Inc.
427 New Sanford Road
LaVergne, Tennessee 37086 Part No. M-414550
Ph.: 800-274-6848 Revision A2 03/2010
www.waltermeier.com Copyright © 2010 Walter Meier (Manufacturing) Inc.
Warranty and Service
Walter Meier (Manufacturing), Inc., warrants every product it sells. If one of our tools needs service or repair, one of our
Authorized Service Centers located throughout the United States can give you quick service. In most cases, any of these
Walter Meier Authorized Service Centers can authorize warranty repair, assist you in obtaining parts, or perform routine
maintenance and major repair on your JET® tools. For the name of an Authorized Service Center in your area call
1-800-274-6848.
MORE INFORMATION
Walter Meier is consistently adding new products to the line. For complete, up-to-date product information, check with your
local Walter Meier distributor, or visit waltermeier.com.
WARRANTY
JET products carry a limited warranty which varies in duration based upon the product (MW stands for Metalworking, WW
stands for Woodworking).
WHAT IS COVERED?
This warranty covers any defects in workmanship or materials subject to the exceptions stated below. Cutting tools,
abrasives and other consumables are excluded from warranty coverage.
WHO IS COVERED?
This warranty covers only the initial purchaser of the product.
WHAT IS THE PERIOD OF COVERAGE?
The general JET warranty lasts for the time period specified in the product literature of each product.
WHAT IS NOT COVERED?
Three Year, Five Year and Lifetime Warranties do not cover products used for industrial or educational purposes. Products
with Three Year, Five Year or Lifetime Warranties that are used for industrial or education purposes revert to a One Year
Warranty. This warranty does not cover defects due directly or indirectly to misuse, abuse, negligence or accidents, normal
wear-and-tear, improper repair or alterations, or lack of maintenance.
HOW TO GET SERVICE
The product or part must be returned for examination, postage prepaid, to a location designated by us. For the name of the
location nearest you, please call 1-800-274-6848.
You must provide proof of initial purchase date and an explanation of the complaint must accompany the merchandise. If
our inspection discloses a defect, we will repair or replace the product, or refund the purchase price, at our option. We will
return the repaired product or replacement at our expense unless it is determined by us that there is no defect, or that the
defect resulted from causes not within the scope of our warranty in which case we will, at your direction, dispose of or
return the product. In the event you choose to have the product returned, you will be responsible for the shipping and
handling costs of the return.
HOW STATE LAW APPLIES
This warranty gives you specific legal rights; you may also have other rights which vary from state to state.
LIMITATIONS ON THIS WARRANTY
WALTER MEIER (MANUFACTURING), INC., LIMITS ALL IMPLIED WARRANTIES TO THE PERIOD OF THE LIMITED
WARRANTY FOR EACH PRODUCT. EXCEPT AS STATED HEREIN, ANY IMPLIED WARRANTIES OR MERCHANTABILITY
AND FITNESS ARE EXCLUDED. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG THE IMPLIED WARRANTY
LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.
WALTER MEIER 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.
SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO
THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.
Walter Meier sells through distributors only. The specifications in Walter Meier catalogs are given as general information
and are not binding. Members of Walter Meier reserve the right to effect at any time, without prior notice, those alterations
to parts, fittings, and accessory equipment which they may deem necessary for any reason whatsoever. JET® branded
products are not sold in Canada by Walter Meier.
Table of Contents
Cover Page ..........................................................................................................................1
Warranty................................................................................................................................2
General Specifications ..........................................................................................................3
Warnings and Safety .............................................................................................................4
Introduction............................................................................................................................7
Operating Instructions............................................................................................................9
Maintenance ....................................................................................................................... 11
Wiring Diagram...................................................................................................................14
Troubleshooting...................................................................................................................16
Replacement Parts .............................................................................................................17
Wiring Diagram...................................................................................................................21
General Specifications
The JETModel J-4210 Belt and Disc Sanding Machine
is ideal for all shops. This versatile machine can be
used to grind, sand, finish, and contour all types of
parts including metal, wood, plastic, and composite
materials. Because of these capabilities, the JET
sander eliminates the need for multiple machines to
perform the same tasks.
Specifications
Model No. J-4210
Stock No. 414550
Belt Size 6" x 48"
Disc Size 10"
Motor
Horsepower 1 HP
Voltage 115/230 Vac (pre-wired for
115 Vac)
Switch Removable Safety Key
Platen Cast Iron
Tables Cast Iron (2)
Belt Speed 1650 SFPM
Disc Speed 2100 RPM
Dust Collection Shrouds Two (standard)
Weight 120 lbs.
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JET Belt/Disc Sander, Model J-4210
plugging in machine.
When using machine:
- Never operate with machine guards missing.
General Machinery Cautions
- 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 and parts manual which was shipped with
your 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.
- Always keep machine guards in place.
- Always put start switch in “OFF” position before
You — the stationary power tool user — hold the key to safety.
Read and follow these simple rules for best results and full benefits from your machine. Used properly, JET
machinery is among the best in design and safety. However, any machine used improperly can be rendered
inefficient and unsafe. It is absolutely mandatory that those who use our products be properly trained in how to
use them correctly. They should read and understand the Operators and Parts Manual as well as all labels
affixed to the machine. Failure in following all of these warnings can cause serious injuries.
- 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 Walter
Meier (Manufacturing) Inc.
Machinery general safety warnings
1. Always wear protective eye wear when operating
machinery. Also use face or dust mask if cutting
operation is dusty. Everyday eyeglasses only
have impact resistant lenses, they are NOT
safety glasses. 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 breakage of eye protection.
2. Wear proper apparel. Do not wear loose clothing,
gloves, neckties, rings, bracelets, or other jewelry
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which may get caught in moving parts. Nonslip
footwear is recommended. Wear protective hair
covering to contain long hair.
3. Do not overreach. Keep proper footing and
balance at all times. Failure to maintain 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 guards removed.
5. Don't use in dangerous environment. Don’t use
power tools in damp or wet locations, or expose
them to rain. Keep work area well lighted.
6. Reduce the risk of unintentional starting. Make
sure switch is in off position before plugging in.
7. Never leave the machine running while unattended. Don't leave machine until it comes to a
complete stop.
8. Disconnect tools before servicing; when changing
accessories, such as blades, bits, cutters, and
the like. Whenever changing accessories or
general maintenance is done on the machine,
electrical power to the machine must be disconnected before work is done.
9. Maintain all machine tools with care. Keep tools
sharp and clean for best and safest performance.
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. Machinery must be anchored to the floor.
11. Secure work. Use clamps or a vise to hold work,
when practical. It’s safer than using your hand
and it frees both hands to operate tool.
12. Never brush away chips while the machine is in
operation.
13. Keep work area clean. Cluttered areas invite
accidents.
14. Remove adjusting keys and wrenches before
turning machine on. Form habit of checking to
see that keys and adjusting wrenches are
removed from tool before turning it on.
15. Use the right tool. Don’t force a tool or attachment to do a job it was not designed for.
16. Use recommended accessories. Consult the
owner’s manual for recommended accessories.
The use of improper accessories may cause risk
of injury to persons.
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 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. Keep children away. All visitors should be kept
safe distance from work area.
21. Make workshops kidproof with padlocks, master
switches, or by removing starter keys.
22. Don't force tool. It will do the job better and safer
at the rate for which it was designed.
23. Never stand on tool. Serious injury could occur if
the tool is tipped or if the cutting tool is unintentionally contacted.
24. Check damaged parts. Before further use of the
tool, a guard or other part that is damaged should
be carefully checked to determine that it will
operate properly and perform its intended function
- check for alignment of moving parts, binding of
moving parts, breakage of parts, mounting, and
any other conditions that may affect its operation.
A guard or other part that is damaged should be
properly repaired or replaced.
25. Direction of feed - Feed work into a blade or
cutter against the direction of rotation of the blade
or cutter only.
26. Never leave tool running unattended. Turn power
off. Don’t leave tool until it comes to a complete
stop.
Grounding Instructions
1. All grounded, cord-connected tools:
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 equipmentgrounding 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.
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.
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.
General Electrical Cautions
This machine should be grounded in accordance with
the National Electrical Code and local codes and
ordinances. This work should be done by a qualified
electrician. The machine should be grounded to
protect the user from electrical shock.
Wire sizes
Caution: for circuits which are far away from the
electrical service box, the wire size must be increased in order to deliver ample voltage to the motor.
To minimize power losses and to prevent motor
overheating and burnout, the use of wire sizes for
branch circuits or electrical extension cords according to the following table is recommended:
Ampere Rating 120V 25 ft 50 ft 100 ft 150 ft
More Not more
than than AWG
0 6 18 16 16 14
6 10 18 16 14 12
10 12 16 16 14 12
12 16 4 12 Not recommended
Volts Total length of cord in feet
240V 50 ft 100 ft 200 ft 300 ft
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Figure A
2. Grounded, cord-connected tools intended for
use on a supply circuit with a nominal rating less
than 150 V:
This tool is intended for use on a circuit that has an
outlet that looks like the one illustrated in Sketch A in
Figure A. The tool has a grounding plug that looks like
the plug illustrated in Sketch A in Figure A. A temporary adapter, which looks like the adapter illustrated in
Sketches B and C, may be used to connect this plug
to a 2-pole receptacle as shown in Sketch B if a
properly grounded outlet is not available.
The temporary adapter should be used only until a
properly grounded outlet can be installed by a qualified electrician. 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.
3. Grounded, cord-connected tools intended for
use on a supply circuit having a nominal rating
between 150 - 250 V, inclusive:
This tool is intended for use on a circuit that has an
outlet that looks like the one illustrated in Sketch D in
Figure A. The tool has a grounding plug that looks like
the plug illustrated in Sketch D in Figure A. Make
sure the tool is connected to an outlet having the
same configuration as the plug. No adapter is avail-
able 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.
4. Permanently connected tools - This tool should
be connected to a grounded metal permanent wiring
system; or to a system having an equipment-grounding conductor.
5. Polarized Plugs - 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.
Safety Requirements for Abrasive Sanding Machines
Abrasive sanding can be hazardous to operators and
bystanders. Sanding sparks, chips and dust particles
thrown off by the sanding disc can cause serious
injury by contact or inhalation. To avoid 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. Use of eye wear which
does not comply with ANSI Z87.1 specifications could
result in severe injury from breakage of eye protection. See Figure B, below.
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 C, below.
4. Additional precautions may be necessary for
sanding materials which are flammable or have other
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hazardous properties. You should always consult the
manufacturer of such materials for instructions on
sanding and handling.
5. Do not force or jamb the workpiece into the
sanding disc.
6. Before sanding, always allow the motor to come
up to operating speed, then check the sanding 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 sanding operations.
7. Abrasive discs 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 Farenheit. Failure to do so could
cause premature disc failure.
8. Examine the face of the sanding disc carefully.
Excessive sanding which wears down to the backing
material can tearing of the disc. Never use a disc
which shows backing, nicks or cuts on the surface or
edge or damage due to creasing or poor handling.
9. When installing a new disc, be certain the disc is
accurately centered on the drive wheel. Failure to do
so could cause a serious unbalanced condition.
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 D.
12. Personal hearing protection such as ear plugs or
ear muffs shall be used to protect against the effect of
noise exposure. See Figure E.
Figure B Figure C Figure D Figure E
Introduction
This manual includes operating and maintenance
instructions for the JET Model J-4210 Belt and Disc
Sander. This manual also includes parts listings and
illustrations of replaceable parts.
Belt and Disc Sander
Features
Figures 1 and 2 depict the main features of the JET
Model J-4210 Belt and Disc Sander. (Specifications
for the sanding machine are provided on page 3.)
Tracking Adjustment
Belt Tensioning Lever
Belt Work Table
Clamping Knob
Sanding Belt
Belt Guard
Platen Housing
Debris Duct
On/Off
Switch
Belt Sander
Work Table
Machine
Base
Stand
Sanding Disk
Disc
Debris
Duct
Miter Gauge
Disc Work Table
Clamping Knob
Figure 1: Belt and Disc Sander Features
(Right Side View)
Power Cord
Figure 2: Belt and Disc Sander Features
(Left Side View)
The sander has both a sanding belt and a sanding
disc for use on a variety of work pieces and materials.
The platen housing for the belt sander can be positioned vertically or horizontally. When in the vertical
position, the drum at the upper end of the platen
housing can be used for contouring. A tracking
adjustment mechanism for the sanding belt is provided at the upper end of the platen housing.
The platen housing has a lever that is used to apply
tension to the sanding belt. The sanding belt is easily
replaced by releasing the tension lever, removing a
sanding shroud and dust collection duct at the bottom
of the platen housing, and slipping the belt from the
belt sander drums. Installation is the reverse of the
removal steps.
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The disc sander consists of an aluminum disc onto
which is installed an adhesive-backed sanding and
other abrasive discs. The disc is contained within a
ducted shroud.
The sanding disc can be replaced by removing the
table and a cover over the lower portion of the disc.
If desired, the aluminum disc can be removed from
its drive shaft to ease replacement of the sanding
disc.
The drive motor for the belt and disc sander is
attached to the underside of the machine base. An
ON/OFF switch is mounted on the machine base on
the side opposite the disc sander. Electrical wiring
for the motor enters the machine base below the ON/
OFF switch and is routed to the switch and motor
inside the machine base.
The belt and disc sander is driven by V-belts connected to the drive motor. A pulley on the motor shaft
drives a V-belt that drives a dual-groove pulley on an
idler shaft. A second V-belt is installed in the second
groove of the dual-groove pulley and connects to a
pulley on belt sander drive shaft.
Installation and Setup
Mounting
It is recommended that the belt and disc sander be
secured to the floor for safe operation. The machine
stand has mounting holes in a flange on the inside of
stand enclosure. The stand can be secured to the
floor using these mounting holes.
Electrical Connection
Refer to the Wiring Data section for wiring information. Electrical power should be connected by a
qualified electrician. Observe local electrical codes
when connecting and grounding the machine.
The aluminum sanding disc is driven off the end of
the idler shaft. A shaft connected to the second Vbelt pulley drives the belt sander drive drum.
The belt and disc sander is mounted on a stand that
can be secured to the floor to stabilize the machine.
The stand has a door for access to the fasteners for
the machine base.
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