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. This bench grinder is designed and intended for
use by properly trained and experienced
personnel only. If you are not familiar with the
proper and safe operation of a bench grinder, do
not use until proper training and knowledge have
been obtained.
5. Do not use this bench 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.
6. 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
breakage of eye protection. (Everyday
eyeglasses only have impact resistant lenses;
they are NOT safety glasses.)
7. Use the grinder’s eye shields and spark guards.
Also use respiratory protection if cutting operation
is dusty.
8. Wear proper apparel. Do not wear loose clothing,
neckties, rings, bracelets, or other jewelry which
may get caught in moving parts. Non-slip
footwear is recommended. Wear protective hair
covering to contain long hair.
9. Wear protective clothing such as apron or safety
shoes, where the grinding activity presents a
hazard to the operator.
10. Wear ear protectors (plugs or muffs) if the
particular work requires it.
11. CALIFORNIA PROPOSITION 65 WARNING:
This product contains chemicals known to the
State of California to cause cancer, or birth
defects or other reproductive harm.
12. This product, when used for welding, cutting, or
working with metal, produces fumes, gases, or
dusts which contain chemicals known to the
State of California to cause birth defects and, in
some cases, cancer. (California Health and
Safety Code Section 25249.5 et seq.)
13. Do not operate this machine while tired or under
the influence of drugs, alcohol or any medication.
14. Make certain the switch is in the OFF position
before connecting the machine to the power
supply.
15. Make certain the machine is properly grounded.
16. Make all machine adjustments or maintenance
with the machine unplugged from the power
source.
17. Remove adjusting keys and wrenches. Form a
habit of checking to see that keys and adjusting
wrenches are removed from the machine before
turning it on.
18. 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.
19. 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.
20. Provide for adequate space surrounding work
area and non-glare, overhead lighting.
21. Keep the floor around the machine clean and free
of scrap material, oil and grease.
22. Keep visitors a safe distance from the work area.
Keep children away.
23. Make your workshop child proof with padlocks,
master switches or by removing starter keys.
24. Give your work undivided attention. Looking
around, carrying on a conversation and “horseplay” are careless acts that can result in serious
injury.
25. Keep proper footing and balance at all times so
that you do not fall into or lean against the
grinding wheel or other moving parts. Do not
overreach or use excessive force to perform any
machine operation.
26. Disconnect grinder from power source before
servicing and when changing abrasive wheels.
27. Use recommended accessories. The use of
improper accessories may cause risk of injury to
persons.
28. Turn off the machine before cleaning. Use a
brush to remove chips or debris — do not use
your hands.
2
29. Never leave the grinder running unattended. Turn
power off and do not leave machine until wheels
come to a complete stop.
30. Remove loose items and unnecessary work
pieces from the area before starting the grinder.
31. Don’t use in dangerous environment. Don’t use
power tools in damp or wet location, or expose
them to rain. Don’t use this grinder in a
flammable environment. Keep work area well
lighted.
32. Keep work area clean. Cluttered areas and
benches invite accidents.
33. Use the right tool. Don't force tool or attachment
to do a job for which it was not designed.
34. Use proper extension cord. Make sure your
extension cord is in good condition. When using
an extension cord, be sure to use one heavy
enough to carry the current your product will
draw. An undersized cord will cause a drop in line
voltage resulting in loss of power and
overheating. Table 1 (see sect. 6.2) shows the
correct size to use depending on cord length and
nameplate ampere rating. If in doubt, use the
next heavier gage. The smaller the gage number,
the heavier the cord.
35. Maintain tools with care. Keep tools sharp and
clean for best and safest performance. Follow
instructions for lubricating and changing
accessories.
36. Direction of feed: Feed work into a blade or cutter
against the direction of rotation of the blade or
cutter only.
37. Do not overtighten wheel nut.
38. Frequently clean grinding dust from beneath
grinder.
39. Use grinding wheel suitable for speed of grinder.
40. Inspect abrasive wheels for cracks or other forms
of damage. Perform a “ring test” to check wheel
integrity. Do not use a faulty or damaged wheel.
41. Verify that maximum RPM of abrasive wheels is
compatible with speed of grinder. Do not remove
the blotter (label) from either side of a grinding
wheel.
42. Allow abrasive wheels to reach full RPM before
starting the grinding operation.
43. Do not crowd the work so that the wheels slow.
44. Tool rests should be adjusted to approximately
1/16” from wheel surface.
45. Do not grind on the side of a wheel; do all work
on the grinding face or edge near the tool rest.
46. Do not grind aluminum or magnesium, as these
may pose a fire hazard.
47. Use only the flanges that are furnished with the
grinder.
48. Do not start the grinder while a workpiece is
contacting a grinding wheel.
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 pos sible
machine damage.
This means that if precautions are not heeded, it may result in serious, or possibly even fatal,
injury.
3
2.0 Table of contents
Section Page
1.0 IMPORTANT SAFETY INSTRUCTIONS ....................................................................................................... 2
2.0 Table of contents ............................................................................................................................................ 4
3.0 About this manual .......................................................................................................................................... 5
5.9 Dust port ..................................................................................................................................................... 9
5.10 Multitool position ....................................................................................................................................... 9
6.3 Voltage conversion ................................................................................................................................... 11
8.4 Belt tracking .............................................................................................................................................. 13
9.1 Ring test ................................................................................................................................................... 13
9.2 Care of grinding wheels ............................................................................................................................ 13
12.0 Replacement Parts ..................................................................................................................................... 18
14.0 Warranty and Service ................................................................................................................................. 22
4
3.0 About this manual
This manual is provided by JET, covering the safe operation and maintenance procedures for a JET IBGM-8VS
Variable Speed Bench Grinder with Multitool Attachment. This manual contains instructions on installation,
safety precautions, general operating procedures, maintenance instructions and parts breakdown. Your 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 c an also be reached at our
web site: 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 atte mpting assembly
or operation! Failure to comply may ca use serious injury!
Register your product using the mail-in card provided, or register online:
http://www.jettools.com/us/en/service-and-support/warranty/registration/
5
4.0 Specifications
Table 1
Model number
Stock number 577218
Motor and Electricals
Motor type Totally enclosed fan-cooled induction with inverter
Horsepower (true output) 1
Motor phase 3
Voltage 115/230V (prewired 115V)
Input power
Cycle 60 Hz
Listed FLA (full load amps) 7 / 3.5 A
On/off switch TACT switch
Motor speed Variable, 900-3600 RPM
Power cable size 16AWG x 3C SJT, 6 ft. (182 cm)
Power plug installed 5-15P, 125V/15A
Recommended circuit size 1 15A
Sound emission without load 2 75 dB at 3 ft.
Arbor and grinding wheel
Arbor diameter 5/8 in. (16mm)
Wheel size (dia. x width) 8 x 1 in. (16 x 25.4mm)
Wheel bore 5/8 in. (16mm)
Wheel material aluminum oxide
Wheel gr it 36 grit
Wheel flange diameter 3-3/8 in. (85mm)
Wheel speed Variable, 900-3600 RPM
Arbor nut maximum tightening torque 20 lbf•ft (270 kgf•cm)
Tool rest distance to wheel adjustable
Abrasive belt
Belt size 36 x 2 in. (915 x 51 mm)
Belt grit, material 100 grit, zirconia alumina
Belt speed 5000 SFPM
Contact wheel (p/n 577115) 3-1/2 Dia. x 2 in. (51 x 89 mm)
Platen size 2 x 6 in. (50.8 x 153 mm)
Abrasive disc
Disc diameter 7 in. (178 mm)
Disc gri t, material 80 grit, zirconia alumina
Disc speed 3,450 RPM
Main materials
Arbor Steel
Base Cast iron
Motor housing Sheet metal
Inner wheel guard Cast iron
Outer wheel guard Aluminum
Flange washers Cast iron
Tool rest Cast iron
Eye shield Clear polycarbonate
Spark guard Steel
Knob Polymide
Dust/swarf collection
Dust port outside diameter 2-1/2 in. (63.5 mm)
Required min. extraction volume 350 CFM
IBGM-8VS
single phase
6
Dimensions
Mounting hole centers 8-1/2 in. (215mm)
Mounting hole diameters 7/16 in. (11mm)
Footprint (width x depth) 9-1/2 x 8-1/16 in. (241.6 x 205 mm)
Assembled dimensions
LxWxH (approx.)
Shipping dimensions (LxWxH) 24-1/2 x 24-1/2 x 19 in. (622 x 622 x 483 mm)
Dust/swarf collection
Dust port outside diameter 2-1/2 in. (63.5 mm)
Required min. extraction volume 350 CFM
Weights
Net weight 80 lb (36.3 kg)
Shipping weight 86.5 lb (40 kg)
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
n/a = not applicable
Horizontal position 17-3/4 x 18 x 10 in. (451 x 457 x 254 mm)
Vertical position 17-3/4 x 12 x 17-1/2 in. (451 x 305 x 445 mm)
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 Mounting hole dimensions
Figure 4-1: IBGM-8VS hole centers
7
5.0 Setup and assembly
5.1 Unpacking
Separate all parts from the packing material. Check
each part against sect. 5.2,Carton contents, and
make certain that all items are accounted for.
(Check grinder to verify if any parts have been premounted.) Notify your dealer or JET if parts are
missing or there is shipping damage. Do not
discard any packing material until grinder is
assembled and operating properly.
5.2 Carton contents
Refer to Figure 5-1.
1 Grinder with Multitool (not shown)
1 Spark guard (A)
1 Lock knob (B)
1 Flat washer, 1/4" (C)
1 Eye shield bracket (D)
1 Eye shield plate (E)
2 Hex cap screw, 3/8 x 3/4" (F)
2 Hex cap screw, 3/8 x 1/2" (G)
2 Truss head screw, 3/16 x 1/2” (H)
4 Flat washers 3/8” (J)
1 Eye shield (K)
1 Tool rest (L)
1 Wheel dresser (M)
1 Grinding belt (not shown)
1 Grinding disc (not shown)
The IBGM-8VS Grinder with Multitool Attachment
requires only the assembly of the eye shield and
tool rest. Additional tools may be needed for
fastening the grinder to a workbench or stand. For
your safety, do not plug the grinder into a power
source until all assembly and adjustments are
complete.
Be sure that the bench grinder
is unplugged and the power switch is in the
OFF position. Do not plug in the grinder to
power until it is inspected for shipping da mage,
fully assembled, and moved to its permanent
location. Failure to comply may cause serious
injury.
Do not operate this grinder
without all guards and shields in place and in
working order. Failure to comply may cause
serious injury.
Chipped or cracked wheels
can break up and cause serious damage to the
grinder and/or severe injury to the operator.
Regularly inspect wheels for damage.
Figure 5-1: Carton contents
5.4 Securing the grinder
To prevent the machine from moving during
operation, it should be securely mounted to a work
surface or grinder stand. Fasteners for mounting
are not included with the grinder.
1. Align the mounting holes on the grinder with
predrilled holes in a bench or grinder stand.
Figure 4-1 shows hole centers for mounting.
2. Insert M8 (or 5/16”) bolts through the holes
and tighten, using washers and nuts.
An optional pedestal stand (not included) is
available from JET for your grinder. See sect. 11.0.
IMPORTANT: The grinder’s base plate contains
ventilation holes for keeping the circuit board at an
acceptable temperature. These holes should not
be obstructed. If the rubber pads are removed for
mounting to a table, allow an opening in the table
below the grinder for air circulation. However, it is
recommended the rubber pads be left on, as they
allow air circulation as well as vibration dampening.
8
5.5 Assembling eye shield bracket to
spark guard
Refer to Figure 5-2.
Note: Spark guard (A) and eye shield bracket (D)
are marked L for left side assembly. Assemble the
spark guard and eye shield bracket using Figure 52 as a guide.
Figure 5-2: bracket to spark guard
5.6 Installing spark guard/bracket
Refer to Figure 5-3.
1. Install spark guard and mounting bracket
assembly to the left wheel housing with two
3/8 x 1/2” hex cap screws (K) and two 3/8" f lat
washers (L).
2. The spark guard (A
within 1/16" of the grinding wheel surface or
other accessory being used. As the wheel
wears down, the spark guard must be readjusted to maintain this 1/16" distance.
) should be adjusted to
1
5.7 Eye shield
Refer to Figure 5-3.
1. Insert two 3/16” x 1/2” truss head screws (H)
through bracket, eye shield (O), and plate (G)
which contains threaded mounting holes.
2. Tighten screws (H).
5.8 Tool rest
Refer to Figure 5-3.
1. Install tool rest (M) by inserting two 3/8" x 3/4"
hex cap screws (J) through two 3/8" flat
washers (L), through the tool rest ( M), into the
wheel housing.
2. The tool rest should be adjusted to within 1/16"
of the grinding wheel or other accessories
being used. As the wheel wears down, the tool
rest must be readjusted to maintain a
maximum 1/16" clearance.
Figure 5-3: guard and tool rest
5.9 Dust port
It is recommended that a metalworking dust
collection system be connected to the grinder’s
dust port, using a 2-1/2 in. diameter hose with hose
clamp (not provided).
5.10 Multitool position
The Multitool attachment is pre-installed in
horizontal position. It can be removed and
positioned in vertical orientation as follows.
Figure 5-4
1. Remove nut (R, Figure 5-4) and slide drive
pulley (S) off shaft.
2. Remove 3 screws and washers (T) and rotate
adaptor plate (U) to vertical position.
3. Reinstall screws and washers , drive pulley and
nut.
9
5.11 Installing/replacing abrasives
See Figure 5-5.
Disc: Clean disc surface of aluminum drive wheel.
If replacing an abrasive, clean old adhesive from
drive wheel with a solvent. Peel off backing and
apply new abrasive (A), centering it on drive wheel.
Belt: Push contact wheel backward (B) and
engage catch (C) to lock in place. Install belt,
making sure directional arrows printed on back of
belt match direction of belt movement. Pull catch
(C) upward to tension belt.
If belt has a lap joint, make sure belt is oriented
according to Figure 5-5, inset.
Figure 5-5: installing abrasives
Figure 6-1: plug configurations
6.1 GROUNDING INSTRUCTIONS
1. All Grounded, Cord-connected Tools:
This tool 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 equipmentgrounding conductor to a live terminal.
6.0 Electrical connections
Electrical connections should
be made by a qualified electrician in
compliance with all relevant codes. This tool
must be properly grounded.
The IBGM-8VS Grinder is prewired for 115V single
phase power, and is supplied with a plug designed
for use on a circuit with a grounded outlet that
looks like the one pictured in A, Figure 6-1. The
grinder may be converted to 230V single phase
power, see sect. 6.3.
Before connecting to power source, be sure switch
is in off position.
It is recommended that the grinder be connected to
a 15-amp circuit with circuit breaker or fuse. If
using fuses, they should be time-delay fuses
marked “D”. Local codes take precedence over
recommendations.
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 outlet can be installed by a
qualified electrician.
10
Note: In Canada, the use of a temporary adaptor is
not permitted by the Canadian Electrical Code,
C22.1.
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 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. A grounding plug may be installed, that looks
like the plug illustrated in D; or the grinder may be
“hard-wired” to a panel, provided there is a
disconnect for the operator.
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.
6.2 Extension cords
The use of extension cords is discouraged. Try to
position equipment near the power source. If an
extension cord becomes necessary, use only
three-wire extension cords that have three-prong
grounding type plugs and three-prong receptacles
that accept the tool's plug. Replace or repair
damaged or worn cord immediately.
Make sure your extension cord is good condition,
and is heavy enough to carry the current your
product will draw. An undersized cord will cause a
drop in line voltage resulting in loss of power and
overheating.
Table 2 shows the correct size to use depending
on cord length and nameplate ampere rating. If in
doubt, use the next heavier gage. The smaller the
gage number (AWG), the heavier the cord.
To change voltage input to 230-volt on the IBGM8VS Grinder, remove existing plug from grinder
cable and attach a UL/CSA listed plug designed for
230V power.
7.0 Operation
Always use approved safety
glasses or face shield while operating tool.
Failure to comply may cause serious injury.
A bench grinder is designed for hand-grinding
operations such as sharpening chisels,
screwdrivers, drill bits, removing excess metal, and
smoothing and polishing metal surfaces.
The IBGM-8VS with Multitool attachment offers
multiple working methods:
•Grinding wheel – A 36-grit wheel is provided,
and is effective when a considerable amount
of metal must be removed, or when obtaining
a smooth finish is not important. A finer grain
abrasive grinding wheel (not provided) can be
mounted for sharpening tools or grinding to
close size tolerances because it removes
metal more gradually for precision grinding
and achieves a smoother finish.
•Disc grinding – Versatile function, such as
dressing small castings and sharpening cutters
and tools, or squaring the ends of a workpiece.
An optional mitering table can be purchased
(see sect. 11.0) to support the workpiece and
facilitate angles.
•Belt and platen (horizontal or vertical position)
– Workpieces of any length can be worked on
the belt and platen.
•Contact wheel – Grinding, polishing and
sanding against belt and contact wheel offers
smooth sanding, removing material more
rapidly than conventional grinding wheels.
•“Free strapping” is grinding, sanding, or
polishing on the underside of belt, opposite the
platen, without a backing behind the belt. This
method is especially suitable for contour work.
Fine belt grades are recommended because of
the rapid material removal.
7.1 Operating controls
Press on/off button on keypad (Figure 7-1) to start
or stop. Press any of the numbered buttons to start
machine at the designated speed. Press arrow
buttons to change rotation speed in 100 RPM
increments.
The digital readout displays RPM (revolutions per
minute), and will flash briefly during start up and
speed adjustments.
11
When OFF button is pushed,
the wheels may take a few moments to
completely stop.
The grinder will automatically shut off after 10
minutes of inactivity.
Note: After extended operation, the grinder
housing may be warm to the touch. This is not
abnormal.
9. When wheel becomes loaded or dull, use an
approved grinding wheel dresser and dress
the wheel face.
7.2.2 Belt and Disc grinding
1. Remove belt before grinding on disc, to
prevent accidental contact of hands with belt.
2. Always grind on downward side of disc.
Grinding on upward side may cause workpiece
to catch and slip from your grasp.
3. At all times, keep hands and fingers away from
pinch points while grinding in disc or belt area.
8.0 Adjustments
8.1 Eye shield tilt adjustment
1. Loosen lock knob (A1, Figure 8-1).
2. Adjust eye shield (A
3. Tighten lock knob.
) to desired tilt angle.
2
Figure 7-1: keypad
7.2 Precautions
7.2.1 Wheel grinding
1. Before starting grinder, turn grinding wheel by
hand to verify that it is clear of obstruction and
turns freely. The tool rest and spark guard
should not touch the wheel.
2. Keep tool rest and spark guard to within 1/16"
of grinding wheel.
3. Turn on grinder and allow it to reach full
running speed before starting to grind.
4. Adjust the eye shield as needed.
5. Keep a steady, moderate pressure on the
workpiece and keep it moving at an even pace
for smooth grinding. Pressing too hard
overheats the motor and prematurely wears
the grinding wheel. Note the original bevel
angle on the item to be sharpened and try to
maintain the same shape. The grinding wheel
should rotate into the object being sharpened.
6. If grinding a narrow workpiece, slide it laterally
across width of wheel. Using full width of
wheel will help prevent a groove from forming
at one place on the wheel.
7. Keep a water pot filled with water and dip your
work into it regularly to prevent overheating.
Overheating can weaken metals. Do not apply
water directly to grinding wheel.
8. Do not use the side of the grinding wheel; this
puts dangerous stress on the wheel.
Figure 8-1: eye shield adjustment
8.2 Spark guard
As the wheel wears down, the spark guard must be
re-adjusted to maintain a 1/16" distance.
Refer to Figure 8-1.
1. Loosen two hex cap screws (B
) with 14mm
1
wrench.
2. Slide spark guard (B
) to 1/16" distance from
2
grinding wheel surface.
3. Tighten screws (B
).
1
8.3 Tool rest
As the wheel wears down, the tool rest must be readjusted to maintain a 1/16" distance.
Refer to Figure 8-1.
1. Loosen two hex cap screws (C
wrench.
2. Slide tool rest (C
) to a distance of 1/16" from
2
grinding wheel.
3. Tighten screws (C
).
1
12
) with 14mm
1
8.4 Belt tracking
Rotate belt by hand to check tracking. If belt shifts
to one side or the other, move tracking lever (D,
Figure 8-2) while rotating belt until belt completely
covers contact wheel and stays centered. Move
lever (D) down for left adjustment, up for right
adjustment. Turn on grinder to verify setting at
operational speed.
If belt refuses to track properly, the rubber contact
wheel must be adjusted parallel to drive wheel, as
follows:
1. If belt wanders away from grinder, loosen top
bolt (E, Figure 8-2) and tap the top of cam
plate (F) away from grinder.
2. If belt wanders toward grinder, loosen top bolt
(E) and tap the top of cam plate (F) toward
grinder.
3. Retighten bolt (E), and use lever (D) for final
tracking.
9.0 User-maintenance
For safety, turn the switch to OFF and remove plug
from the power source outlet before adjusting and
maintaining the bench grinder. If the power cord is
worn, cut or damaged in any way, have it replaced
immediately.
9.1 Ring test
Before replacing a grinding wheel, perform this
simple test on the replacement wheel:
1. Loop a piece of string through the grinding
wheel hole and suspend the wheel by holding
up the string.
2. Tap the wheel with a piece of scrap wood or a
wooden dowel.
3. A good wheel will "ring"; a defective wheel will
"thud". Discard any wheel that does not "ring".
An internal defect may not be apparent by visual
inspection alone. The ring test may identify an
internal crack or void.
9.2 Care of grinding wheels
Figure 8-2: belt tracking
8.5 Platen adjustment
The platen should be set so that it just contacts
underside of tensioned belt, but not so high that
belt rides up over it, which will hasten wear on belt
and machine. Loosen hex nuts (G, Figure 8-3) and
adjust as needed.
Figure 8-3: platen adjustment
In normal use, grinding wheels may become
cracked, grooved, rounded at the edges, chipped,
out of true or loaded with foreign material.
Cracked wheels should be replaced
IMMEDIATELY. The other conditions can be
remedied with a dressing tool. New wheels
sometimes require dressing to make them round.
See sect. 9.5.
9.3 Changing wheels
The JET bench grinder comes equipped with a
general purpose grinding wheel. Wheels vary
according to types of abrasive, hardness, grit size,
and structure. Contact your local distributor for the
proper grinding wheel or wire wheel brush for your
application.
If you replace a wheel, obtain one with a safe rated
speed at least as high as the NO LOAD RPM
marked on the grinder's nameplate. Table 3 shows
correct dimensions for the replacement wheel.
Model
IBGM-8VS
Your bench grinder will accept most polishing and
buffing wheels available at dealers and hardware
stores.
Wheel
Diameter
8" 1" 5/8"
Maximum
Table 3
Width
Center
Hole
The use of any other
accessory is not recommended and may result
in serious injury!
13
To change a wheel (see Figure 9-1):
1. Disconnect grinder from power source.
2. Loosen spark guard (B) and tool rest (C) and
move them away from the wheel.
3. Remove wheel guard using a cross-point or
flathead screwdriver.
4. Stabilize wheel by holding opposite wheel
firmly, or placing a wood wedge between
wheel and tool rest.
Figure 9-1: wheel replacement
5. Unscrew arbor nut (D ) with wrench. Note: Lef thand threads; turn nut clockwise to loosen.
6. Remove outer flange (E), wheel (F), and inner
flange.
7. Clean flanges. Check the flanges to make sure
they are flat. Wheel flanges that are not flat will
cause the wheel to wobble.
8. Inspect the new grinding wheel and perform a
“ring test” (sect. 9.1). Do not install a damaged
wheel.
9. Install inner flange, wheel (F), outer flange (E)
and nut (D) on the shaft. Tighten nut.
Do not overtighten nut;
this may cause the wheel to crack.
Maximum safe torque on nut is 20 lbf•ft
(270 kgf•cm).
The operator who takes time to patiently perform
needed adjustments will be rewarded by a wheel
running true, and accurate grinding of work pieces.
9.4.1 Adjusting concentricity
If the outside face is not rotating concentric to
arbor, try shifting the wheel closer to arbor
centerline before tightening the nut.
Another method of achieving concentricity is the
use of a wheel dresser. “Dressing” is the removal
of the current layer of abrasive to expose a fresh
surface. A wheel dresser is also used to “true” a
wheel; that is, to make the grinding surface parallel
to the tool rest, so the entire wheel face presents
an even surface to the work piece. Proper use of a
wheel dresser will eliminate high spots and result in
concentric rotation about the arbor, as well as
minimize vibration. See sect. 9.5.
9.4.2 Correcting side-to-side wobble
The IBGM-8VS Grinder has large, machined
flanges, making wobble unlikely if a good quality
grinding wheel is used. Should a wheel exhibit
need for adjustment:
1. Loosen nut and rotate the outer flange a little.
Snug the nut and spin the wheel by hand to
check.
2. If wobble still exists, continue repeating step 1,
rotating outer flange incrementally in the same
direction. See Figure 9-2. Make sure to keep
the wheel in the same position each time.
3. If complete rotation of outer flange has proved
ineffective, remove nut, outer flange, and
wheel (keep wheel in same orientation by
placing a pencil mark on it somewhere for
reference). Then rotate inner flange about 90°
and repeat the above steps for the outer
flange.
4. Continue this combination of flange
movements until the wobble is eliminated.
If required, a shim made of paper or card stock
may be placed between flange and wheel side.
10. Reinstall guard cover. Adjust spark guards and
tool rests to 1/16" clearance from wheel.
9.4 Wheel balancing
With the grinder unplugged from the power source, and arbor nut snugged down, rotate wheel
by hand and observe its motion.
A grinding wheel has proper balance when:
1. The wheel’s outside face spins true and round;
that is, its circumference rotates concentric to
the arbor.
2. There is no side-to-side wobble.
Figure 9-2: wheel balancing
NOTE: Very slight wobble may still exist at spin-up
and spin-down, but will not affect normal speed
operation.
14
9.5 Dressing the wheel
Below is a general procedure for dressing a
grinding wheel.
Use safety glasses or face
shield during dressing operations.
9.7 Cleaning
Metal shavings may still b e hot
from recent grinding operations. Make sure
shavings and debris are cold before cleaning
the grinder.
1. Back off the tool rest enough to allow the
dresser to hook over its inside edge (Figure 9-
3). Tighten tool rest in position.
2. Turn on grinder and allow it to reach operating
speed.
3. Set the wheel dresser on the rest and bring it
into contact with the wheel by raising its
handle. Hold the dresser firmly.
Note: If sparks appear, increase the pressure
of the dresser discs against the wheel.
4. Move the dress er evenly left and right across
the wheel face until the wheel looks clean and
is square to the tool rest.
5. Remove the dresser, and adjust the tool rest to
1/16” away from the newly dressed wheel.
Figure 9-3: wheel dressing
9.6 Wire wheel brushes
Wire brushing (not provided) is a fast way to
remove rust scale, burrs, and paint from metal. Use
coarse wire brushes for hard cleaning jobs. Use
fine wire brushes for polishing and finish work.
When the brush tips become dull, reverse the
brush on the grinder.
Avoid use of the following
cleaning chemicals or solvents: gasoline,
carbon tetrachloride, chlorinated solvents,
ammonia and household detergents contai ning
ammonia.
Brush all shavings from the motor housing, tool
rest, wheel guards and sanding belt areas. Check
grinding wheel for cracks and chips. Replace if
damaged.
Periodically use a cleaning stick (not provided)
against the belt and abrasive disc to remove buildup.
If the abrasive belt becomes loaded, it can be
cleaned in a solvent. Allow to dry thoroughly before
reinstalling.
9.8 Lubrication
All motor bearings are permanently lubricated and
sealed at the factory and require no additional
lubrication.
9.9 Additional servicing
Any additional servicing on the grinder should be
performed by an authorized service representative.
* WARNING: Some corrections may require a qualified electrician.
Symptom Possible Cause Correction *
Motor will not start. Not connected to power source. Verify that plug is properly inserted into
receptacle.
Motor cord cut or abraded. Replace with new cord.
Motor will not start;
fuses blow or circuit
breakers trip.
Wheels cannot rotate because of
obstruction.
Plug on cord is faulty. Replace with new plug.
Low line voltage. Check power line for proper voltage.
Fuse blown or circuit breaker open. Re-set. May be too many machines on
Faulty switch. Replace switch.
Open circuit in motor or loose
connection.
Motor faulty, or inverter PCB fault. Contact JET technical service.
Too many electrical machines
running on same circuit.
Incorrect fuse. Use time-delay fuse, or go to circuit with
Wheels cannot rotate because of
obstruction.
Undersized extension cord. Use correct size extension cord.
Short circuit in line cord or plug. Inspect cord or plug for damaged
Unplug and turn wheel by hand to ensure
free movement. Restart.
one line.
Inspect all lead connections on motor for
loose or open connections.
Turn off other machines and try again.
higher rated fuse or breaker.
Unplug and turn grinding wheel by hand to
ensure free movement. Clear any
obstructions and restart.
insulation and shorted wires.
Short circuit in motor or loose
connections.
Motor fails to develop
full power.
Motor overheats. Motor overloaded. Reduce pressure against wheel. Make
Motor stalls, resulting
in blown fuses or
tripped circuit.
Low line voltage. Check power line for proper voltage.
Faulty motor or capacitor. Contact JET technical service.
Motor overloaded. Reduce load on motor; do not press so
Capacitor failure. Contact JET technical service.
Short circuit in motor or loose
connections.
Low voltage. Correct the low voltage conditions.
Incorrect fuses or circuit breakers in
power line.
Inspect all connections on motor for loose
or shorted terminals or worn insulation.
sure grit size is appropriate for the job.
hard.
Inspect connections on motor for loose or
shorted terminals or worn insulation.
Install correct fuses or breakers.
16
Symptom Possible Cause Correction *
Motor slows. Motor overloaded. Reduce load to motor; do not press so
hard.
Low line voltage. Check power line for proper voltage.
Loose connections. Inspect connections.
Frequent fuse or circuit
breaker failure.
Excessive vibration. Wheel(s) out of balance; wobbling or
Motor overload. Reduce load to motor; do not press so
hard.
Electrical circuit overload; too many
electrical machines running on same
circuit.
Incorrect fuse or circuit breaker Have electrician upgrade service to outlet.
not rotating concentric to arbor.
Improper mounting. Secure machine firmly to bench or stand.
Turn off other machines and try again.
Dress wheel or replace it. Adjust wobble
by rotating flange as needed.
10.2 Digital readout error codes
Table 5
Message Possible Cause Correction *
OCL Internal electronic overload has been tripped.
OH IGBT protection activated.
Do not overload motor; reduce pressure of
workpiece against wheels.
Inspect wire connections to U/V/W for possible
short circuits. Verify that motor rating
corresponds to AC motor drive output power.
OE
LE1
LP1 Low input voltage (below AC driver limits) Use correct voltage.
Excessive input voltage (exceeds AC driver
limits).
Low voltage; AC motor driver detects that DC
bus voltage has fallen below minimum
threshold
Use correct voltage.
Make sure input voltage falls within range of AC
motor input voltage range. Check for abnormal
load in motor.
17
11.0 Optional accessories
These accessory items, purchased separately, are available for your JET bench grinder. Contact your dealer to
order, or call JET at the phone number on the cover.
577113 577117577119
Mitering Table Kit for MultitoolBuffing Compound KitMetalworking Belt/Disc Starter Kit
578172 578173578100
Stand for Grinders Deluxe Stand for Grinders Flexible 3W LED Lamp
The following accessories are for using the Grinder with the JET #414800 (JDCS-505) Dust Collection Stand:
414825 Reducer, 3 in. to 2.5 in.
414811 0.6M Hose, Heat Resistant, ø2.5 x 24.4 in.
(includes two 1/4 x 3/8 mounting screws)
12.0 Replacement Parts
Replacement parts are listed on the following pages. To order parts or reach ou r service department, call 1800-274-6848 Monday through Friday, 8:00 a.m. to 5:00 p.m. CST. Having the Model Number and Serial
Number of your machine available when you call will allow us to serve you quickly and accurately.
Non-proprietary parts, such as fasteners, can be found at local hardware stores, or may be ordered from JET.
Some parts are shown for reference only, and may not be available individually.
For replacement parts on the Multitool Attachment, contact:
17 .............. IBG8-17 ..................... Motor Fan ................................................................ ...................................... 1
19 .............. IBG8-19 ..................... End Bell ................................................................... ...................................... 2
41 .............. TS-2284082 .............. Pan Head Screw ...................................................... M4 x 8 ........................... 4
42 .............. IBG8-42 ..................... Screw ....................................................................... M 5 x 0.8 x 205 .............. 4
46 .............. IBG8-46 ..................... Power Cord with 15A Plug ....................................... 16AWG x 3C SJT ......... 1
For other replacement parts on the Multitool attachment, contact Multitool at 800-660-0880.
20
13.0 Electrical Connections – IBGM-8VS Grinder
21
14.0 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 outside recommended guidelines 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.
22
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23
427 New Sanford Road
LaVergne, Tennessee 37086
Phone: 800-274-6848
www.jettools.com
24
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