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Operating Instructions and Parts Manual
8-inch Bench Grinder
Model JWBG-8
JET
427 New Sanford Road Part No. M-726100
LaVergne, Tennessee 37086 Revision D 03/2019
Ph.: 800-274-6848 ECR 190221081618
www.jettools.com Copyright © 2015 JET
(shown with optional grinding wheels – not provided)
1.0 Warranty and Service
JET warrants every product it sells against manufacturers’ defects. If one of our tools needs service or repair, please
contact Technical Service by calling 1-800-274-6846, 8AM to 5PM CST, Monday through Friday.
Warranty Period
The general warranty lasts for the time period specified in the literature included with your product or on the official
JET branded website.
JET products carry a limited warranty which varies in duration based upon the product. (See chart below)
Accessories carry a limited warranty of one year from the date of receipt.
Consumable items are defined as expendable parts or accessories expected to become inoperable within a
reasonable amount of use and are covered by a 90 day limited warranty against manufacturer’s defects.
Who is Covered
This warranty covers only the initial purchaser of the product from the date of delivery.
What is Covered
This warranty covers any defects in workmanship or materials subject to the limitations stated below. This warranty
does not cover failures due directly or indirectly to misuse, abuse, negligence or accidents, normal wear-and-tear,
improper repair, alterations or lack of maintenance. JET woodworking machinery is designed to be used with Wood.
Use of these machines in the processing of metal, plastics, or other materials may void the warranty. The exceptions
are acrylics and other natural items that are made specifically for wood turning.
Warranty Limitations
Woodworking products with a Five Year Warranty that are used for commercial or industrial purposes default to a
Two Year Warranty. Please contact Technical Service at 1-800-274-6846 for further clarification.
How to Get Technical Support
Please contact Technical Service by calling 1-800-274-6846. Please note that you will be asked to provide proof
of initial purchase when calling. If a product requires further inspection, the Technical Service representative will
explain and assist with any additional action needed. JET has Authorized Service Centers located throughout the
United States. For the name of an Authorized Service Center in your area call 1-800-274-6846 or use the Service
Center Locator on the JET website.
More Information
JET is constantly adding new products. For complete, up-to-date product information, check with your local distributor
or visit the JET website.
How State Law Applies
This warranty gives you specific legal rights, subject to applicable state law.
Limitations on This Warranty
JET LIMITS ALL IMPLIED WARRANTIES TO THE PERIOD OF THE LIMITED WARRANTY FOR EACH PRODUCT.
EXCEPT AS STATED HEREIN, ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE EXCLUDED. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN
IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.
JET 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.
JET sells through distributors only. The specifications listed in JET printed materials and on official JET website are
given as general information and are not binding. JET reserves 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
Product Listing with Warranty Period
90 Days – Parts; Consumable items
1 Year – Motors; Machine Accessories
2 Year – Metalworking Machinery; Electric Hoists, Electric Hoist Accessories; Woodworking Machinery used
for industrial or commercial purposes
5 Year – Woodworking Machinery
Limited Lifetime – JET Parallel clamps; VOLT Series Electric Hoists; Manual Hoists; Manual Hoist
Accessories; Shop Tools; Warehouse & Dock products; Hand Tools; Air Tools
NOTE: JET is a division of JPW Industries, Inc. References in this document to JET also apply to JPW Industries,
Inc., or any of its successors in interest to the JET brand.
®
branded products are not sold in Canada by JPW Industries, Inc.
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2.0 Table of contents
Section Page
1.0 Warranty and Service ..................................................................................................................................... 2
2.0 Table of contents ............................................................................................................................................ 3
3.0 Safety warnings .............................................................................................................................................. 4
4.0 About this machine and manual ..................................................................................................................... 5
5.0 Specifications ................................................................................................................................................. 6
6.0 Setup and assembly ....................................................................................................................................... 7
6.1 Shipping contents ....................................................................................................................................... 7
6.2 Unpacking and cleanup .............................................................................................................................. 7
6.3 Tools required for assembly ....................................................................................................................... 7
6.4 Mounting the grinder .................................................................................................................................. 8
6.5 Exhaust ports ............................................................................................................................................. 8
6.6 Assembling eye shield brackets to spark guards ....................................................................................... 8
6.7 Installing spark guards/brackets ................................................................................................................. 8
6.8 Eye shields ................................................................................................................................................. 8
6.9 Tool rests .................................................................................................................................................... 8
6.10 Grinding wheel selection .......................................................................................................................... 9
6.11 Ring test ................................................................................................................................................... 9
6.12 Grinding wheel installation ....................................................................................................................... 9
6.13 Wheel balancing ..................................................................................................................................... 10
7.0 Electrical connections .................................................................................................................................. 10
7.1 Grounding instructions ............................................................................................................................. 11
7.2 Extension cords ........................................................................................................................................ 11
8.0 Adjustments ................................................................................................................................................. 11
8.1 Eye shield tilt adjustment .......................................................................................................................... 11
8.2 Spark guards ............................................................................................................................................ 11
8.3 Tool rest adjustment ................................................................................................................................. 12
9.0 Operation ..................................................................................................................................................... 12
9.1 Switch ....................................................................................................................................................... 12
9.2 Precautions .............................................................................................................................................. 12
10.0 Maintenance ............................................................................................................................................... 12
10.1 Care of grinding wheels .......................................................................................................................... 12
10.2 Changing wheels .................................................................................................................................... 12
10.3 Cleaning ................................................................................................................................................. 13
10.4 Lubrication .............................................................................................................................................. 13
11.0 Optional accessory ..................................................................................................................................... 13
12.0 Troubleshooting the JWBG-8 ..................................................................................................................... 14
13.0 Replacement Parts ..................................................................................................................................... 15
13.1.1 JWBG-8 Bench Grinder – Exploded View ........................................................................................... 16
13.1.2 JWBG-8 Bench Grinder – Parts List .................................................................................................... 17
14.0 Electrical Connections ................................................................................................................................ 19
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3.0 Safety warnings
1. Read and understand the entire owner's
manual before attempting assembly or
operation.
2. Read and understand the warnings posted on
the machine and in this manual. Failure to
comply with all of these warnings may cause
serious injury.
3. Replace warning labels if they become
obscured or removed.
4. Do not use this grinder for other than its
intended use. If used for other purposes, JET
disclaims any real or implied warranty and
holds itself harmless from any injury that may
result from that use.
5. Always use the grinder’s eye shields. In
addition, wear ANSI Z87.1 approved safety
glasses, or a face shield. (Everyday
eyeglasses only have impact resistant lenses;
they are NOT safety glasses.)
6. Before operating grinder, remove tie, rings,
watches and other jewelry, and roll sleeves up
past elbows. Do not wear loose-fitting clothing.
Confine long hair.
7. Wear protective clothing such as apron or
safety shoes, where the grinding activity
presents a hazard to the operator.
8. Wear ear protectors (plugs or muffs) if the
particular work requires it.
9. Do not operate this machine while tired or
under the influence of drugs, alcohol or any
medication.
10. Make certain the switch is in the OFF position
before connecting the machine to the power
supply.
11. Make certain the machine is properly
grounded.
12. Make all machine adjustments or maintenance
with the machine unplugged from the power
source.
13. Remove adjusting keys and wrenches. Form a
habit of checking to see that keys and
adjusting wrenches are removed from the
grinder before turning it on.
14. Keep safety guards in place at all times when
the machine is in use. If removed for
maintenance purposes, use extreme caution
and replace the guards immediately after
completion of maintenance.
15. Check damaged parts. Before further use of
the machine, 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.
16. Provide for adequate space surrounding work
area and non-glare, overhead lighting.
17. Keep the floor around the machine clean and
free of scrap material, oil and grease.
18. Keep visitors a safe distance from the work
area. Keep children away.
19. Make your workshop child proof with padlocks,
master switches or by removing starter keys.
20. Give your work undivided attention. Looking
around, carrying on a conversation and “horseplay” are careless acts that can result in
serious injury.
21. Maintain a balanced stance at all times so that
you do not fall into the tool or other moving
parts. Do not overreach or use excessive force
to perform any machine operation.
22. Disconnect grinder before servicing and when
changing abrasive wheels.
23. Use recommended accessories. The use of
improper accessories may cause risk of injury
to persons.
24. Turn off the machine before cleaning. Use a
brush or compressed air to remove chips or
debris — do not use your hands.
25. Never leave the grinder running unattended.
Turn power off and do not leave machine until
wheels come to a complete stop.
26. Remove loose items and unnecessary work
pieces from the area before starting the
grinder.
27. Don’t use in dangerous environment. Don’t
use power tools in damp or wet location, or
expose them to rain. Keep work area well
lighted.
28. Inspect abrasive wheels for cracks or other
forms of damage. Perform a “ring test” to
check wheel integrity (see section 6.10). Do
not use a faulty or damaged wheel.
29. Verify that maximum RPM of abrasive wheels
is compatible with speed of grinder.
30. Allow abrasive wheels to reach full RPM
before starting the grinding operation.
31. Do not crowd the work so that the wheels
slow.
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32. Tool rest should be adjusted less than 1/8”
from wheel surface.
33. Do not grind on side of wheel; do all work on
the grinding face or edge near the tool rest.
34. Do not grind aluminum or magnesium, as
these may pose a fire hazard.
WARNING: This product can expose you to
chemicals including lead and cadmium which
are known to the State of California to cause
cancer and birth defects or other reproductive
harm, and phthalates which are known to the
State of California to cause birth defects or
other reproductive harm. For more information
go to http://www.p65warnings.ca.gov.
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.
This means that if precautions are not heeded, it may result in serious injury or possibly even
death.
WARNING: Drilling, sawing, sanding or
machining wood products generates wood dust
and other substances known to the State of
California to cause cancer. Avoid inhaling dust
generated from wood products or use a dust
mask or other safeguards for personal
protection.
Wood products emit chemicals known to the
State of California to cause birth defects or
other reproductive harm. For more information
go to http://www.p65warnings.ca.gov/wood.
4.0 About this machine and manual
The JET JWBG-8 Bench Grinder is designed primarily for woodworkers; the slow speed is optimal for grinding
and sharpening common tool steels – lathe turning chisels, gouges, knives, plane irons, carving tools, and
more. Abrasive wheels are protected by cast iron guards. The large tool rests are adjustable, with a tilt angle
scale and incised lines to help align tools square to the wheel. A steel spark guard and plexiglass eye shield
provide safety (personal eye protection still required). Rubber foot pads prevent sliding. Alternatively, mounting
holes are provided in the base for securing the unit to a bench or stand. Heavy-duty machined flanges keep the
grinding wheel true and reduce runout.
This manual is provided by JET covering the safe operation and maintenance procedures for a JET Model
JWBG-8 Bench Grinder. This manual contains instructions on assembly, safety precautions, general operating
procedures, maintenance instructions and parts breakdown. Your bench grinder has been designed and
constructed to provide consistent, long-term operation if used in accordance with the instructions set forth in
this document.
The operator is encouraged to familiarize him/herself with ANSI B7.1 – Safety Requirements for Use, Care and
Protection of Abrasive Wheels.
If there are questions or comments, please contact your local supplier or JET. JET can also be reached at our
website: www.jettools.com.
Retain this manual for future reference. If the grinder 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!
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5.0 Specifications
Model number .................................................................................................................................................... JWBG-8
Stock numbers:
Bench Grinder (grinding wheels not provided) ................................................................................................ 726101
Motor and electricals:
Motor type ....................................................................................... induction, capacitor start, with centrifugal switch
Horsepower ..................................................................................................................................................... 1/2 HP
Phase ............................................................................................................................................................... single
Voltage .............................................................................................................................................................. 115V
Cycle .................................................................................................................................................................. 60Hz
Listed FLA (full load amps) ................................................................................................................................ 6.5 A
On/off switch ..................................................................................................................................................... toggle
Motor speed ............................................................................................................................................... 1725 RPM
Power transfer .......................................................................................................................................... direct drive
Power cable size ............................................................................................................................................ 16AWG
Power cable length ................................................................................................................................. 6 ft. (182cm)
Power plug installed .............................................................................................................................................. yes
Recommended circuit size1 ................................................................................................................................ 15 A
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Arbor and grinding wheels:
Arbor diameter ....................................................................................................................................... 5/8” (16 mm)
Wheel size (dia. x width) ........................................................................................................... 8” x 1" (16 x 25.4mm)
Wheel bore ............................................................................................................................................. 5/8” (16mm)
Wheel flange diameter ........................................................................................................................................ 2.86”
Wheel speed .............................................................................................................................................. 1725 RPM
Arbor nut maximum tightening torque ................................................................................... 10.12 lbf-ft (140 kgf-cm)
Distance bench top to arbor centerline ............................................................................................... 6.18” (157mm)
Toolrests:
Tilt angle .................................................................................................................................................. 45° forward
Distance to wheel .......................................................................................................................................adjustable
Materials:
Arbor ................................................................................................................................................................... steel
Base ............................................................................................................................................................. cast iron
Body ...................................................................................................................................... cast iron and aluminum
Wheel guards ......................................................................................................................... cast iron and aluminum
Wheel flanges ..................................................................................................................................................... steel
Tool rests ........................................................................................................................ cast iron with milled surface
Eye shields .............................................................................................................................................. clear acrylic
Spark guards ...................................................................................................................................................... steel
Knobs ...........................................................................................................................................................polymide
Dimensions:
Mounting hole centers ...................................................................................................................... 7.244” (184mm)
Mounting hole diameters ....................................................................................................................... 3/8” (9.5mm)
Footprint (width x depth) ............................................................................................. 8-1/4” x 6-1/4” (210 x 158mm)
Overall dimensions, assembled (width x depth x height) ...................... 20-1/4” x 12” x 12-1/2” (514 x 305 x 318mm)
Shipping carton dimensions (width x depth x height) ............................ 22-1/4” x 14-3/8” x 14” (565 x 365 x 358mm)
Dust/swarf collection:
Dust port outside diameter ......................................................................................................................... 2” (50mm)
Recommended minimum extraction volume ................................................................................................ 350 CFM
Weights:
Net ....................................................................................................................................................... 48 lb (21.8 kg)
Shipping ............................................................................................................................................... 52 lb (23.6 kg)
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.
subject to local/national electrical codes.
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