12" DOUBLE DISC SANDER
MODEL G8793
INSTRUCTION MANUAL
COPYRIGHT ©2000 BY GRIZZLY INDUSTRIAL, INC.
WARNING: NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE
OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.
JUNE, 2000 PRINTED IN TAIWAN
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TABLE OF CONTENTS
PAGE
1. SAFETY RULES
SAFETY INSTRUCTIONS FOR POWER TOOLS . . . . . . . . . . . . . . . . . . . . . . . . .2-3
ADDITIONAL SAFETY INSTRUCTIONS FOR THE SANDER . . . . . . . . . . . . . . . . .4
2. CIRCUIT REQUIREMENTS
110V OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
220V OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
EXTENSION CORDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
GROUNDING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3. GENERAL INFORMATION
COMMENTARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
PIECE INVENTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
CLEAN UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
SITE CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
4. ASSEMBLY
MOUNTING TO STAND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
DISC TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
ATTACHING SANDPAPER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
5. ADJUSTMENTS
TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
MITER GAUGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
6. OPERATIONS
TABLE TILT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
DISC SANDING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
MITER SANDING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
7. MAINTENANCE
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
ATTACHING DISCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
ATTACHING DISC GUARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
DUST PORTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
8. CLOSURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
MACHINE DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
PARTS DIAGRAMS/PARTS LISTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20-21
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
G8793 12" Double Disc Sander
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SECTION 1: SAFETY
For Your Own Safety Read Instruction
Manual Before Operating This Equipment
The purpose of safety symbols is to attract your attention to possible hazardous conditions.
This manual uses a series of symbols and signal words which are intended to convey the level
of importance of the safety messages. The progression of symbols is described below.
Remember that safety messages by themselves do not eliminate danger and are not a substi-
tute for proper accident prevention measures.
Indicates an imminently hazardous situation which, if not
avoided, WILL result in death or serious injury.
Indicates a potentially hazardous situation which, if not
avoided, COULD result in death or serious injury.
Indicates a potentially hazardous situation which, if not
avoided, MAY result in minor or moderate injury. It may also
be used to alert against unsafe practices.
This symbol is used to alert the user to useful information
about proper operation of the equipment.
NOTICE
Safety Instructions For Power Tools
5. KEEP CHILDREN AND VISITORS
AWAY. All children and visitors should be
kept a safe distance from work area.
1. KEEP GUARDS IN PLACE and in working
order.
2. REMOVE ADJUSTING KEYS AND
WRENCHES. Form habit of checking to
see that keys and adjusting wrenches are
removed from tool before turning on.
6. MAKE WORK SHOP CHILD PROOF with
padlocks, master switches, or by removing
starter keys.
7. DON’T FORCE TOOL. It will do the job
better and safer at the rate for which it was
designed.
3. KEEP WORK AREA CLEAN. Cluttered
areas and benches invite accidents.
4. DON’T USE IN DANGEROUS ENVIRON-
MENT. Don’t use power tools in damp or
wet locations, or where any flammable or
noxious fumes may exist. Keep work area
well lighted.
8. USE RIGHT TOOL. Don’t force tool or
attachment to do a job for which it was not
designed.
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G8793 12" Double Disc Sander
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Safety Instructions For Power Tools
9. USE PROPER EXTENSION CORD. Make
sure your extension cord is in good condi-
tion. Conductor size should be in accor-
dance with the chart below. The amperage
rating should be listed on the motor or tool
nameplate. An undersized cord will cause a
drop in line voltage resulting in loss of
power and overheating. Your extension
cord must also contain a ground wire and
plug pin. Always repair or replace exten-
sion cords if they become damaged.
13. DON’T OVERREACH. Keep proper foot-
ing and balance at all times.
14. MAINTAIN TOOLS WITH CARE. Keep
tools sharp and clean for best and safest
performance. Follow instructions for lubri-
cating and changing accessories.
15. DISCONNECT TOOLS before servicing
and changing accessories, such as blades,
bits, cutters, and the like.
Minimum Gauge for Extension Cords
16. REDUCE THE RISK OF UNINTENTION-
AL STARTING. Make sure switch is in off
position before plugging in.
LENGTH
AMP RATING
0-6
7-10
11-12
13-16
25ft 50ft 100ft
18
18
16
14
12
10
16
16
16
12
12
10
16
14
14
12
10
No
17. USE RECOMMENDED ACCESSORIES.
Consult the owner’s manual for recom-
mended accessories. The use of improper
accessories may cause risk of injury.
17-20
21-30
18. CHECK DAMAGED PARTS. Before fur-
ther 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, bind-
ing 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.
10. WEAR PROPER APPAREL. Do not wear
loose clothing, gloves, neckties, rings,
bracelets, or other jewelry which may get
caught in moving parts. Non-slip footwear
is recommended. Wear protective hair cov-
ering to contain long hair.
11. ALWAYS USE SAFETY GLASSES. Also
use face or dust mask if cutting operation is
dusty. Everyday eyeglasses only have
impact resistant lenses, they are NOT safe-
ty glasses.
19. NEVER LEAVE TOOL RUNNING UNAT-
TENDED. TURN POWER OFF. Don’t
leave tool until it comes to a complete stop.
12. SECURE WORK. Use clamps or a vise to
hold work when practical. It’s safer than
using your hand and frees both hands to
operate tool.
G8793 12" Double Disc Sander
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Additional Safety Instructions For The Sander
1. Be aware of belt or disc rotation direction
6. Even if you have a reliable method of dust
collection, use a dust mask or respirator
when sanding. Use eye and hearing pro-
tection as well.
when sanding.
2. Keep fingertips away from moving parts.
3. Never use excessive force when sanding.
Doing so greatly increases the chance of
personal injury, mechanical damage, or
damage to your workpiece.
7. DO NOT sand material when you doubt its
stability or integrity. Inspect all materials
carefully for foreign objects like nails and
staples.
4. Always feed your work AGAINST the
8. When disc sanding, feed material into the
portion of the disc spinning DOWN toward
the table.
direction of rotation.
5. DO NOT operate the sander if the disc or
belt are damaged or badly worn. Portions
of sandpaper could be ejected from the
sander.
9. Habits – good and bad – are hard to break.
Develop good habits in your shop and
safety will become second-nature to you.
Like all power tools, there is danger asso-
ciated with the Model G8793 Double Disc
Sander. Accidents are frequently caused
by lack of familiarity or failure to pay atten-
tion. Use this tool with respect and caution
to lessen the possibility of operator injury.
If normal safety precautions are over-
looked or ignored, serious personal injury
may occur.
Operating this equipment has the potential
to propel debris into the air which can
cause eye injury. Always wear safety glass-
es or goggles when operating equipment.
Everyday glasses or reading glasses only
have impact resistant lenses, they are not
safety glasses. Be certain the safety glass-
es you wear meet the appropriate stan-
dards of the American National Standards
Institute (ANSI).
No list of safety guidelines can be complete.
Every shop environment is different. Always
consider safety first, as it applies to your
individual working conditions. Use this and
other machinery with caution and respect.
Failure to do so could result in serious per-
sonal injury, damage to equipment or poor
work results.
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G8793 12" Double Disc Sander
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SECTION 2: CIRCUIT REQUIREMENTS
110V Operation
220V Operation
The G8793 Sander motor is prewired to operate
at 110V. A 110V plug is included with this
machine. The plug must be used in a grounded
receptacle similar to that shown in Figure 1.
The motor supplied with the G8793 can be oper-
ated at either 110V or 220V. The motor comes
pre wired for 110V. Refer to the wiring diagram
inside the motor cover for information about con-
verting to operate at 220V.
Under normal 110V use, the motor draws approx-
imately 20 amps. We recommend a 20 amp cir-
cuit breaker or a 20 amp slow-blow fuse.
If converting to operate at 220V, a suitable 220V
plug must be wired in. When operating at 220V,
we recommend using a NEMA-style 6L-15 plug
and outlet. See Figure 2. You may also “hard-
wire” the machine directly to your panel, provided
you place a disconnect switch near the machine.
Check the electrical codes in your area for
specifics on wiring requirements.
Grizzly recommends that the circuit you use
should be dedicated, (i.e., the G8793 should pro-
vide the only draw from that circuit). If frequent
circuit failures occur when using this machine,
contact our Service Department or your local
electrical contractor.
Under normal use, the motor draws approximate-
ly 10 amps @ 220V. We recommend a 15 amp
circuit breaker for 220V operation This should be
satisfactory for normal use while providing
enough protection against motor damage caused
by power surges.
Figure 1. Typical 110V 3-prong plug and outlet.
Figure 2. Typical 220V 3-prong plug and outlet.
G8793 12" Double Disc Sander
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Extension Cords
Grounding
If you find it necessary to use an extension cord
with the Model G8793, make sure the cord is
rated Hard Service (grade S) or better. Refer to
the chart in the standard safety instructions to
determine the minimum gauge for the extension
cord. The extension cord must also contain a
ground wire and plug pin. Always repair or
replace extension cords when they become worn
or damaged.
In the event of an electrical short, grounding
reduces the risk of electric shock by providing a
path of least resistance to disperse electric cur-
rent. This tool is equipped with a power cord hav-
ing an equipment-grounding conductor. See
Figures 1 and 2. The outlet must be properly
installed and grounded in accordance with all
local codes and ordinances.
We do not recommend the use of extension
cords on 220V equipment. It is much better to
arrange the placement of your equipment and the
installed wiring to eliminate the need for exten-
sion cords.
This equipment must be grounded. Verify
that any existing electrical outlet and circuit
you intend to plug into is actually ground-
ed. If it is not, it will be necessary to run a
separate 12 A.W.G. copper grounding wire
from the outlet to a known ground. Under
no circumstances should the grounding pin
from any three-pronged plug be removed.
Serious injury may occur.
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G8793 12" Double Disc Sander
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SECTION 3: GENERAL INFORMATION
Most importantly, we stand behind our machines.
We have an excellent service department at your
disposal should the need arise. If you have any
service questions or parts requests, please call or
Commentary
write to us at the location listed below.
Grizzly Industrial, Inc. is proud to offer the Model
G8793 12" Double Disc Sander. This sander is a
part of Grizzly’s growing family of fine woodwork-
ing machinery. When used according to the
guidelines set forth in this manual, you can
expect years of trouble-free, enjoyable operation,
and proof of Grizzly’s commitment to customer
satisfaction.
Grizzly Industrial, Inc.
1203 Lycoming Mall Circle
Muncy, PA 17756
Phone: (570) 546-9663
Fax: (800) 438-5901
E-Mail: [email protected]
The Model G8793 features heavy-duty cast-iron
tables and discs with a powerful 11⁄2 HP motor
with a 1725 RPM rotational speed. The twin discs
allow the user to put a coarse grit on one side and
a finer grit on the other to speed sanding tasks.
Both tables tilt 45˚ in both directions and have
convenient miter slots. Each disc has an integral
4" dust port.
To comment on this manual write to:
Grizzly Industrial, Inc.
Technical Documentation
P.O. Box 2069
C
⁄O
Bellingham, WA 98227-2069
The specifications, drawings and photographs
represent the G8793 as supplied when the man-
ual was created. Due to our policy of continuous
improvement, some features of this machine may
vary from that portrayed in this manual.
We are also pleased to provide this manual with
the G8793. This instruction manual was written to
guide you through assembly, review safety con-
siderations, and cover general operating proce-
dures. It represents our latest effort to produce
the best documentation possible. If you have any
criticisms that you feel we should pay attention to
in our next printing, please write to us at the
address shown to the right.
To operate this, or any power tool, safely
and efficiently, it is essential to become as
familiar with its characteristics as possible.
The time you invest before you begin to use
your Model G8793 will be time well spent.
DO NOT operate this machine until you are
completely familiar with the contents of this
manual. Make sure you read and under-
stand all of the safety procedures. If you do
not understand something, DO NOT operate
the machine.
G8793 12" Double Disc Sander
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Unpacking
Piece Inventory
The Double Disc Sander is shipped from the fac-
tory in a carefully packed carton. If you find the
machine to be damaged after you’ve signed for
delivery and the truck and driver are already
gone, you will need to file a freight claim with the
carrier. Save the containers and all packing mate-
rials for inspection by the carrier or their agent.
Without the packing materials, filing a freight
claim can be difficult. If you need advice regard-
ing this situation, please call us.
With all the parts removed from the container,
you should have the components listed below:
• Cabinet Stand
• Motor and Disc Assembly
• Tables (2)
• 12" PSA Sandpaper Discs (2)
• Miter Gauge
If anything is missing, call or write to the appro-
priate service department listed in the General
Information section. If anything is damaged,
please follow the procedures described to the
left.
The G8793 is a fairly heavy machine (190
lbs). DO NOT over-exert yourself while
unpacking or moving your machine – get
assistance. In the event that your Double
Disc Sander must be moved up or down a
flight of stairs, be sure that the stairs are
capable of supporting the combined weight
of people and the machine. Serious per-
sonal injury may occur.
When you are completely satisfied with the con-
dition of your shipment, you should inventory its
parts.
NOTICE
Please keep all packaging materials until
you are satisfied that the machine is in
good condition. Should you need to file a
freight claim, the carrier’s agent will require
inspection of those materials. Settling a
claim can be difficult if packaging is not
available.
-8-
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Site Considerations
Clean Up
The unpainted surfaces are coated with a waxy
oil to protect it from corrosion during shipment.
Remove this protective coating with a solvent
cleaner or citrus-based degreaser such as
Grizzly’s G7895 Degreaser. Avoid chlorine-
based solvents as they may damage painted sur-
faces should they come in contact. Always follow
the usage instructions on the product you choose
for clean up.
WORKING CLEARANCES
Working clearances can be thought of as the dis-
tances between machines and obstacles that
allow safe operation of every machine without
limitation. Consider existing and anticipated
machine needs, size of material to be processed
through each machine, and space for auxiliary
stands and/or work tables. Also consider the rel-
ative position of each machine to one another for
efficient material handling. Be sure to allow your-
self sufficient room to safely run your machines in
any foreseeable operation.
Many of the solvents commonly used to
clean machinery can be highly flammable,
and toxic when inhaled or ingested. Always
work in well-ventilated areas far from
potential ignition sources when dealing
with solvents. Use care when disposing of
waste rags and towels to be sure they do
not create fire or environmental hazards.
Keep children and animals safely away
when cleaning and assembling this
machine.
LIGHTING AND OUTLETS
Lighting should be bright enough to eliminate
shadow and prevent eye strain. Electrical circuits
should be dedicated or large enough to handle
combined motor amp loads. Outlets should be
located near each machine so power or exten-
sion cords are not obstructing high-traffic areas.
Be sure to observe local electrical codes for prop-
er installation of new lighting, outlets, or circuits.
Do not use gasoline or other petroleum-
based solvents to remove this protective
coating. These products generally have low
flash points which makes them extremely
flammable. A risk of explosion and burning
exists if these products are used. Serious
personal injury may occur.
Make your shop “child safe”. Ensure that
your workplace is inaccessible to young-
sters by closing and locking all entrances
when you are away. Never allow visitors in
your shop when assembling, adjusting or
operating equipment.
All die-cut metal parts have a sharp edge
(called “flashing”) on them after they are
formed. This is generally removed at the
factory. Sometimes a bit of flashing might
escape inspection, and the sharp edge may
cause cuts or lacerations when handled.
Please examine the edges of all die-cut
metal parts and file or sand the edge to
remove the flashing before handling.
G8793 12" Double Disc Sander
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SECTION 4: ASSEMBLY
Disc Table
Mounting To Stand
The two disc tables must be mounted to the sand-
ing unit’s table tile trunnions. Loosen the star
knob and move the two trunnions until they are
approximately perpendicular to the face of the
disc. Position the table over the four threaded
holes, and install four (4) socket head cap
screws. Repeat this procedure for the other disc
table.
The sanding motor body must be mounted to the
stand before the machine can be used. Remove
the stand and sanding unit from the packaging. If
you will be using a mobile base to allow moving
the disc sander around, now is a good time to
place the stand on a properly adjusted mobile
base. This will eliminate the need to lift the com-
bined machine and stand unit later on.
Lift the sanding unit and place it on top of the
stand so that the ON/OFF switch is on the same
side of the machine as the door of the cabinet.
Use an assistant to lift the unit and to aid in get-
ting the holes aligned. Use four (4) hex bolts, nuts
and washers to secure the unit to the stand.
Trunnion
Star Knob
Figure 3. Attaching disc table.
DO NOT attempt to operate this machine
before completing the assembly and adjust-
ment instructions. Be sure that the switch is
off and the cord is disconnected from the
power source at all times until assembly
and adjustment are complete and you have
reviewed all safety guidelines. Serious
injury could occur.
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G8793 12" Double Disc Sander
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the upper half of the disk which extends above
the table. Once it is positioned evenly across the
disc, press the adhesive onto the surface. Now
rotate the disk so the lower half is now exposed.
Bend the paper back to allow removal of the
remaining half of the protective layer (See Figure
5), and then press this portion against the disk.
Attaching Sandpaper
The sanding disc sticks to the surface of the cast
iron disc using the pressure sensitive adhesive
backing (PSA) on the reverse side of the sand-
paper disc. The sandpaper can be replaced with-
out removing either the table or the dust port.
Peel back the protective layer on one-half of the
sandpaper disc and fold it against the remaining
half. Slip the half which still has the protective
layer on it between the disc and the table edge
See Figure 4. Position the exposed adhesive on
Figure 5. Removing protective layer.
Figure 4. Sandpaper being slipped between the
disc and table.
G8793 12" Double Disc Sander
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SECTION 5: ADJUSTMENTS
Tables
Miter Gage
The tables should be adjusted so they are per-
pendicular to the face of the sanding disc when
the table tilt is set to 0˚. Using a try square or
machinist’s square, set one edge of the table sur-
face and the other against the face of the disc.
(This can be done with the sandpaper installed,
although it is somewhat easier to measure if the
disc does not have the sandpaper disc installed)
See Figure 6. Loosen the star knob and adjust
the table angle until it is perfectly perpendicular.
Tighten the star knob.
The miter gauge needs to be adjusted so that it is
perfectly perpendicular to the face of the wheel
when it is mounted in the table slot. There is no
adjustment in the table itself. The miter gauge
face relative to the the table slot is adjustable.
Use a try square or machinist’s square with one
edge against the face of the miter gauge and the
other against the disc face. See Figure 7.
Loosen the adjusting screw on the miter gauge
and adjust so that it is flush with the edge of the
square. Tighten the gauge adjusting screw, and
double check. Sometimes the tightening proce-
dure can affect the adjustment.
Loosen the bolt holding the degree pointer and
move it so it is pointing to 0˚. Tighten the bolt.
Move the table tilt and return it to the 0˚ point
using the indicator, then recheck with the square
to verify the setting.
Set the pointer on the miter gauge to 0˚ by loos-
ening the screw holding the pointer in position.
Adjust the pointer and retighten.
Tilt Pointer
Figure 6. Squaring disc table.
Figure 7. Squaring miter gauge to disc.
-12-
G8793 12" Double Disc Sander
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SECTION 6: OPERATIONS
The cast iron disc accepts 12" diameter cloth or
Table Tilt
paper-backed PSA sanding discs. These are
available in a variety of grits. See the current
Grizzly catalog for prices and ordering informa-
tion.
The disc table can go from -45˚ to 45˚ relative to
the plane of the sanding surface.
Please review all safety rules for sanders and all
power tools before attempting operation. The
hints listed below are also worth your considera-
tion:
Whenever possible, sand with an open angle
where there is plenty of clearance between the
belt and the table. This will avoid getting the work-
piece trapped between the sanding surface and
the table.
1. When using the table for beveled sanding
operations, try to keep an open table angle
(90˚ or more). This eliminates the risk of
getting the workpiece jammed between the
disc and the table.
2. The surface feet per minute of the spinning
disc increases as you move from the center
to the rim.
Rotating sanding discs are dangerously
abrasive. Use extreme caution when work-
ing near sanding surfaces. Failure to exer-
cise care while sanding could result in
severe injury.
3. Do not over-sand soft woods such as bass
wood or pine.
4. Choose the correct sanding grit for the job.
5. Do not use the sander as a replacement for
a bandsaw or a planer. It is designed for fin-
ish work, not rough dimensioning.
Operating this equipment has the potential
to propel debris into the air which can
cause eye injury. Always wear safety glass-
es or goggles when operating equipment.
Everyday glasses or reading glasses only
have impact resistant lenses, they are not
safety glasses. Be certain the safety glass-
es you wear meet the appropriate stan-
dards of the American National Standards
Institute (ANSI).
6. Keep your workpiece moving across the
face of the disc to prevent grooves or ruts in
the surface you’re sanding.
G8793 12" Double Disc Sander
-13-
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Disc Sanding
Miter Sanding
First, set the angle of the table relative to the
sanding disc. When perpendicularity is required
between two surfaces, the miter gauge will help
to guide the workpiece so that the relationship is
maintained. Place one surface firmly against the
face of the miter gauge, with the other surface
against the face of the disc. See Figure 8. If
sanding curves or irregular shapes, freehand
sanding without the miter gauge can be done.
Always keep the workpiece on the side of the
wheel which is rotating down toward the table.
This will keep the workpiece from flying out of
your hands from the rotational forces.
The most efficient way to get a perfect miter is to
cut the workpiece slightly long and sand it to the
desired dimension. Miter sanding can be done
easily with the miter gauge:
1. Loosen the knob on the miter gauge and
adjust the angle to the desired point.
Tighten the knob.
2. Slide the miter gauge into its slot and use it
to hold your workpiece in position. The
miter gauge can be used in either direction
in the slot to achieve the proper relation of
the workpiece to the disc.
3. With light, but firm pressure, push the work-
piece slowly into the downspin side of the
rotating disc. See Figure 9.
Rotation
Figure 8. Disc sanding.
Figure 9. Mitering with gauge reversed.
Operating this equipment has the potential
to propel debris into the air which can
cause eye injury. Always wear safety glass-
es or goggles when operating equipment.
Everyday glasses or reading glasses only
have impact resistant lenses, they are not
safety glasses. Be certain the safety glass-
es you wear meet the appropriate stan-
dards of the American National Standards
Institute (ANSI).
-14-
G8793 12" Double Disc Sander
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SECTION 7: MAINTENANCE
General
Tables
The tables and other non-painted surfaces on the
Model G8793 should be protected against rust
and pitting. Wiping the sander clean after every
use ensures that moisture from wood dust isn’t
allowed to trap moisture against bare metal sur-
faces.
The Double Disc Sander is ruggedly constructed
to provide years of dependable service. To
ensure that you enjoy maximum performance
and longevity, we suggest the following routine
maintenance:
1. Check all fasteners for tightness before
Some woodworkers recommend using automo-
tive paste wax on exposed steel and cast iron
surfaces. The wax provides a layer of protection,
as well as reducing friction between lumber and
the table, making cuts faster and smoother. Avoid
waxes that contain silicone or other synthetic
ingredients. These materials can find their way
into lumber that’s being worked, and can make
staining and finishing difficult. If you use paste
wax, make sure that it’s 100% Carnauba wax.
each use. Tighten when necessary.
2. Keep the Double Disc Sander clean for
maximum efficiency and heat dissipation.
Wipe away accumulated sanding dust and
grime after each use.
3. Inspect sanding discs for excessive wear
and damage. Replace if necessary.
4. Inspect switches and cord periodically for
wear or damage. Replace if necessary.
5. Bearings are sealed and permanently lubri-
cated, so no lubrication is needed. Check
for wear periodically and replace when
worn. Increased motor noise and vibration
are both indicators of bearing wear.
DO NOT make adjustments or attempt any
maintenance procedures while this
machine is running. Ensure that the switch
is off, power is disconnected and all mov-
ing parts have stopped before making
adjustments. Failure to do so could result
in serious operator injury.
G8793 12" Double Disc Sander
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Attaching Disc
Attaching Disc Guard
The sanding discs attach to the motor shaft by
means of a keyed shaft. Make sure the key is in
place in the groove of the shaft, then slide the
disc onto the shaft with the slot in the disc bore
aligned with the key. Push the disc onto the shaft
until it bottoms out, then tighten the two set
screws. See Figure 10.
Place the disc guard over the disc and use two
Phillips® head screws to hold in place. See Figure 11.
Figure 11. Attaching disc guard.
Dust Ports
Figure 10. Attaching disc.
The dust port mounts beneath the table, with the
port directed downward, and is attached with four
(4) Phillips® head screws. See Figure 12.
Figure 12. Attaching dust port.
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SECTION 8: CLOSURE
The following pages contain general machine
We recommend you keep a copy of our current
catalog for complete information regarding
Grizzly's warranty and return policy. If you need
additional technical information relating to this
machine, or if you need general assistance or
replacement parts, please contact the Service
Department listed in Section 3: General
Information.
data, part diagrams/lists, troubleshooting guide
and Warranty/Return information for your Model
G8793 Double Disc Sander.
If you need parts or help in assembling your
machine, or if you need operational information,
we encourage you to call our Service
Department. Our trained service technicians will
be glad to help you.
Additional information sources are necessary to
realize the full potential of this machine. Trade
journals, woodworking magazines, and your local
library are good places to start.
If you have comments dealing specifically with
this manual, please write to our Bellingham,
Washington location using the address in
Section 3: General Information. The specifica-
tions, drawings, and photographs illustrated in
this manual represent the Model G8793 as sup-
plied when the manual was prepared. However,
due to Grizzly’s policy of continuous improve-
ment, changes may be made at any time with no
obligation on the part of Grizzly. Whenever pos-
sible, though, we send manual updates to all
owners of a particular tool or machine. Should
you receive one, add the new information to this
manual and keep it for reference.
The Model G8793 was specifically designed
for sanding. DO NOT MODIFY AND/OR USE
THIS MACHINE FOR ANY OTHER PUR-
POSE. Modifications or improper use of this
tool will void the warranty. If you are confused
about any aspect of this machine, DO NOT
use it until you have answered all your ques-
tions. Serious personal injury may occur.
We have included some important safety mea-
sures that are essential to this machine’s opera-
tion. While most safety measures are generally
universal, Grizzly reminds you that each work-
shop is different and safety rules should be con-
sidered as they apply to your specific situation.
Like all power tools, there is danger associ-
ated with this machine. Accidents are fre-
quently caused by lack of familiarity or fail-
ure to pay attention. Use this tool with
respect and caution to lessen the possibili-
ty of operator injury. If normal safety pre-
cautions are overlooked or ignored, seri-
ous personal injury may occur.
G8793 12" Double Disc Sander
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MACHINE DATA
SHEET
Customer Service #: (570) 326-3806 • To Order Call: (800) 523-4777 • Fax #: (800) 438-5901
GRIZZLY MODEL G8793 DOUBLE DISC SANDER
Design Type .................................................................................................... Floor Model
Overall Dimensions:
Height ......................................................................................................................43"
Width......................................................................................................................341⁄4
"
"
Depth ....................................................................................................................153⁄4
Shipping Weight................................................................................................190 lbs.
Foot Print......................................................................................................19" x 151⁄2
Motor:
"
Type ............................................................................TEFC Capacitor-Start Induction
Horsepower ........................................................................................................11⁄2 HP
Phase - Voltage......................................................................Single Phase 110 ⁄ 220V
Amps ....................................................................................................................20/10
Cycle/ RPM ..................................................................................60 Hertz ⁄ 1725 RPM
Switch ............................................................................Mechanical - Separate On/Off
Bearings ..............................................................Shielded & Lubricated Ball Bearings
Features:
................................................................................................Two 12" Cast Iron Discs
........................................................................Tables are Precision Ground Cast Iron
..........................................................................................Tables Measure 141⁄2" x 73⁄4
"
............................................................................Tables Tilt from 45° Up to 45° Down
........................................................................................................3⁄4" x 3⁄8" Miter Slots
............................Cabinet with Door Has 1 Shelf for 2 Compartments 18" W x 15" D
..........................................................................................4" Dust Ports on Each Side
Specifications, while deemed accurate, are not guaranteed.
REVISED 6/00
-18-
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TROUBLESHOOTING
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
Motor will not start.
1. Low voltage.
1. Check power line for proper voltage.
2. Open circuit in motor or 2. Inspect all lead connections on motor for
loose connections. loose or open connections.
Motor will not start; 1. Short circuit in line cord 1. Inspect cord or plug for damaged insulation
fuses or circuit break-
ers blow.
or plug.
2. Short circuit in motor or 2. Inspect all connections on motor for loose
loose connections. or shorted terminals or worn insulation.
and shorted wires.
3. Incorrect fuses or circuit 3. Install correct fuses or circuit breakers.
breakers in power line.
Motor fails to develop 1. Power line overloaded 1. Reduce load on power line.
full power (power out-
put of motor decreas-
with lights, appliances,
and other motors.
es
rapidly
with 2. Undersized wires or cir- 2. Increase wire sizes or reduce length of
decrease in voltage at
motor terminals).
cuits too long.
wire.
3. General overloading of 3. Request a power check from the power
power company facili-
ties.
company.
Motor overheats.
1. Motor overloaded.
1. Reduce load on motor.
2. Air circulation through the 2. Clean out motor to provide normal air circu-
motor restricted. lation.
Motor stalls (resulting 1. Short circuit in motor or 1. Inspect connections on motor for loose or
in blown fuses or
tripped circuit).
loose connections.
2. Low voltage.
shorted terminals or worn insulation.
2 Correct the low voltage conditions.
3. Incorrect fuses or circuit 3. Install correct fuses or circuit breakers.
breakers in power line.
4. Motor overloaded.
4. Reduce load on motor.
Machine slows down
when operating.
Applying too much pres-
sure to workpiece.
Feed workpiece slower.
Sanded surface not 1. Table not perpendicular 1. Adjust table tilt.
square.
to disc.
2. Miter gauge not square to 2. Adjust miter gauge.
disc.
G8793 12" Double Disc Sander
-19-
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G8793 DISC SANDER PARTS DIAGRAM
O N
O F F
-20-
G8793 12" Double Disc Sander
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G8793 DISC SANDER PARTS LIST
REF# PART#
DESCRIPTION
REF# PART#
DESCRIPTION
001 P8793001 BASE
029 P8793029 SWITCH
002 P8793002 DISC HOUSING
003 P8793003 DISC
030 P8793030 PHLP HD SCR 3/16-24 X 3/4
031 P8793031 PHLP HD SCR 3/16-24 X 1/4
"
"
004 P8793004 DUST PORT
005 P8793005 DISC TABLE
006 P8793006 MOTOR ASSEMBLY
007 P8793007 MOTOR SUPPORT
008 P8793008 BUSHING, POINTER
010 P8793010 SHAFT
033 PK23M
034 PS04
035 PS07
KEY 5 X 5 X 25
PHLP HD SCR 1/4-20 X 1/2
PHLP HD SCR 1/4-20 X 3/8
"
"
036 P8793036 WASHER 1/4
"
037 PSB07
038 PB18
039 PW02
CAP SCREW 5/16-18 X 3/4
HEX BOLT 3/8-16 X 1"
"
011 P8793011 NUT
FLAT WASHER 3/8
"
012 P8793012 STAND
040 PWRCRD110S POWER CORD 110V, SHORT
041 PB09
HEX BOLT 5/16-18 X 1/2
042 P8793042 SANDING DISC
013 P8793013 TRUNNION, FRONT
014 P8793014 TRUNNION, REAR
015 P8793015 DISC GUARD
016 P8793016 POINTER
"
047 PWRCRD110L POWER CORD 110V, LONG W/PLUG
048 P8793048 STRAIN RELIEF
049 P8793049 STAR KNOB
017 P8793017 TRUNNION ARC
018 P8793018 SCALE, FRONT TRUNNION
019 P8793019 SCALE, REAR TRUNNION
020 P8793020 ROTATION ARROW
050 PRP18M
053 PW07
ROLL PIN 4 X 12
FLAT WASHER 5/16"
054 PW02M
FLAT WASHER 5MM
021 PSB08
022 PW07
023 PN02
024 PB19
CAP SCREW 5/16-18 X 11/2
FLAT WASHER 5/16"
HEX NUT 5/16-18
"
055 P8793055 PHLP HD SCR 3/16-24 X 3/8
"
060 P8793060 KNOB, MITER GAUGE
1
061 P8793061`
⁄4" WASHER
HEX BOLT 1/4-20 X 1/2
"
062 P8793062 MITER GAUGE BODY
063 P8793063 PHLP HD SCR 3/16-24 X 3/8
064 P8793064 POINTER
025 P8793025 PIN 5 X 15
"
026 PB13
027 PW01
028 PSS17
HEX BOLT 1/4-20 X 11/4
FLAT WASHER 1/2
SET SCREW 5/16-18 X 5/16"
"
"
065 P8793001 MITER BAR
066 P8793066 STRAIN RELIEF
G8793 12" Double Disc Sander
-21-
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WARRANTY AND RETURNS
Grizzly Industrial, Inc. warrants every product it sells for a period of 1 year to the original purchaser from
the date of purchase. This warranty does not apply to defects due directly or indirectly to misuse, abuse,
negligence, accidents, repairs or alterations or lack of maintenance. This is Grizzly’s sole written warranty
and any and all warranties that may be implied by law, including any merchantability or fitness, for any par-
ticular purpose, are hereby limited to the duration of this written warranty. We do not warrant or represent
that the merchandise complies with the provisions of any law or acts unless the manufacturer so warrants.
In no event shall Grizzly’s liability under this warranty exceed the purchase price paid for the product and
any legal actions brought against Grizzly shall be tried in the State of Washington, County of Whatcom.
We shall in no event be liable for death, injuries to persons or property or for incidental, contingent, spe-
cial, or consequential damages arising from the use of our products.
To take advantage of this warranty, contact us by mail or phone and give us all the details. We will then
issue you a “Return Number’’, which must be clearly posted on the outside as well as the inside of the car-
ton. We will not accept any item back without this number. Proof of purchase must accompany the mer-
chandise.
The manufacturers reserve the right to change specifications at any time because they constantly strive to
achieve better quality equipment. We make every effort to ensure that our products meet high quality and
durability standards and we hope you never need to use this warranty.
Please feel free to write or call us if you have any questions about the machine or the manual.
Thank you again for your business and continued support. We hope to serve you again soon.
-22-
G8793 12" Double Disc Sander
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WARRANTY CARD
Name ____________________________________________________________________________________
Street ____________________________________________________________________________________
City ______________________________________________________________State________Zip_________
Phone Number_______________________E-Mail_______________________FAX________________________
MODEL # G8793 12" Double Disc Sander
Order #______________________________________________
The following information is given on a voluntary basis. It will be used for marketing purposes to help us develop better products and services. Of course, all informa-
tion is strictly confidential.
1.
2.
How did you learn about us?
___Advertisement
___Catalog
___World Wide Web
___Friend
___Card Deck
10.
Which benchtop tools do you own? Check all that apply.
___1" x 42" Belt Sander
___5" - 8" Drill Press
___8" Table Saw
___8" - 10" Bandsaw
___Disc/Belt Sander
___Mini Jointer
___6" - 8" Grinder
___Mini Lathe
___10" - 12" Thickness Planer
___Scroll Saw
___Other__________________________________________________
Which of the following magazines do you subscribe to.
___Spindle/Belt Sander
___American Woodworker
___Cabinetmaker
___Practical Homeowner
___Shop Notes
___Today’s Homeowner
___WOOD
___Wooden Boat
___Woodshop News
___Woodsmith
___Woodwork
___Woodworker
___Woodworker’s Journal
___Workbench
___Other__________________________________________________
How many of the machines checked above are Grizzly? ____________
___Family Handyman
___Fine Homebuilding
___Fine Woodworking
___Home Handyman
___Journal of Light Construction
___Old House Journal
___Popular Mechanics
___Popular Science
11.
12.
Which portable/hand held power tools do you own? Check all that apply.
___Belt Sander
___Biscuit Joiner
___Circular Saw
___Detail Sander
___Drill/Driver
___Orbital Sander
___Palm Sander
___Portable Planer
___Saber Saw
___Reciprocating Saw
___Router
___Popular Woodworking
___Other__________________________________________________
Which of the following woodworking/remodeling shows do you watch?
___Miter Saw
3.
___Other__________________________________________________
What machines/supplies would you like Grizzly Industrial to carry?
___Backyard America
___Home Time
___The New Yankee Workshop
___This Old House
13.
___The American Woodworker
___Woodwright’s Shop
___12" Table Saw
___12" Jointer
___Combination Planer/Jointer
___Paint & Finishing Supplies
___Contractor’s Supplies
___Radial Arm Saw
___Panel Saw
___Brass Hardware
___Lumber
___Other__________________________________________________
What is your annual household income?
4.
5.
___$20,000-$29,999
___$30,000-$39,999
___$40,000-$49,999
___$50,000-$59,999
___$60,000-$69,999
___$70,000-$79,999
___$80,000-$89,999
___$90,000 +
___Other__________________________________________________
What new accessories would you like Grizzly Industrial to carry?
14.
15.
___Builders Hardware
___Fasteners
___Hand Tools
___Wood Components
What is your age group?
___20-29
___30-39
___40-49
___50-59
___60-69
___70 +
___Other__________________________________________________
What other companies do you purchase your tools and supplies from?
__________________________________________________________
__________________________________________________________
Do you think your purchase represents good value?
6.
7.
8.
How long have you been a woodworker?
___0 - 2 Years
___2 - 8 Years
___8 - 20 Years
___20+ Years
16.
17.
18.
How would you rank your woodworking skills?
___Yes
Would you recommend Grizzly Industrial to a friend?
___Yes ___No
___No
___Simple
___Intermediate
___Advanced
___Master Craftsman
What stationary woodworking tools do you own? Check all that apply.
Would you allow us to use your name as a reference for Grizzly customers
in your area? Note: We never use names more than three times.
___Air Compressor
___Band Saw
___Panel Saw
___Planer
___Drill Press
___Power Feeder
___Radial Arm Saw
___Shaper
___Spindle Sander
___Table Saw
___Yes
___No
___Drum Sander
___Dust Collector
___Horizontal Boring Machine
___Jointer
___Lathe
___Mortiser
19.
Comments:_________________________________________________
__________________________________________________________
__________________________________________________________
__________________________________________________________
___Vacuum Veneer Press
___Wide Belt Sander
___Other__________________________________________________
How many of your woodworking machines are Grizzly? _____________
9.
__________________________________________________________
G8793 12" Double Disc Sander
-23-
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FOLD ALONG DOTTED LINE
GRIZZLY INDUSTRIAL, INC.
P.O. BOX 2069
BELLINGHAM, WA 98227-2069
FOLD ALONG DOTTED LINE
Send a Grizzly Catalog to a friend:
Name_______________________________
Street_______________________________
City______________State______Zip______
TAPE ALONG EDGES--PLEASE DO NOT STAPLE
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