Grizzly G8793 User manual

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

G8793 12" Double Disc Sander -1-
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

-2- G8793 12" Double Disc Sander
SECTION 1: SAFETY
Safety Instructions For Power Tools
5. KEEP CHILDREN AND VISITORS
AWAY. All children and visitors should be
kept a safe distance from work area.
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.
8. USE RIGHT TOOL. Don’t force tool or
attachment to do a job for which it was not
designed.
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.
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.
For Your Own Safety Read Instruction
Manual Before Operating This Equipment
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.
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.
NOTICE

G8793 12" Double Disc Sander -3-
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.
Minimum Gauge for Extension Cords
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.
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.
LENGTH
AMP RATING 25ft 50ft 100ft
0-6 18 16 16
7-10 18 16 14
11-12 16 16 14
13-16 14 12 12
17-20 12 12 10
21-30 10 10 No
Safety Instructions For Power Tools
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.
16. REDUCE THE RISK OF UNINTENTION-
AL STARTING. Make sure switch is in off
position before plugging in.
17. USE RECOMMENDED ACCESSORIES.
Consult the owner’s manual for recom-
mended accessories. The use of improper
accessories may cause risk of injury.
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.
19. NEVER LEAVE TOOL RUNNING UNAT-
TENDED. TURN POWER OFF. Don’t
leave tool until it comes to a complete stop.

-4- G8793 12" Double Disc Sander
Additional Safety Instructions For The Sander
1. Be aware of belt or disc rotation direction
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.
4. Always feed your work AGAINST the
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.
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.
7. DO NOT sand material when you doubt its
stability or integrity. Inspect all materials
carefully for foreign objects like nails and
staples.
8. When disc sanding, feed material into the
portion of the disc spinning DOWN toward
the table.
9. Habits – good and bad – are hard to break.
Develop good habits in your shop and
safety will become second-nature to you.
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).
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.
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.

G8793 12" Double Disc Sander -5-
220V Operation
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.
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.
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.
SECTION 2: CIRCUIT REQUIREMENTS
110V 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.
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.
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.
Figure 1. Typical 110V 3-prong plug and outlet.
Figure 2. Typical 220V 3-prong plug and outlet.

-6- G8793 12" Double Disc Sander
Grounding
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.
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.
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.
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.
Extension Cords

G8793 12" Double Disc Sander -7-
SECTION 3: GENERAL INFORMATION
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.
The Model G8793 features heavy-duty cast-iron
tables and discs with a powerful 11⁄2HP 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.
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.
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
write to us at the location listed below.
Grizzly Industrial, Inc.
1203 Lycoming Mall Circle
Muncy, PA 17756
Phone: [phone]
Fax: [phone]
E-Mail: [email protected]
Web Site: www.grizzly.com
To comment on this manual write to:
Grizzly Industrial, Inc.
C⁄OTechnical Documentation
P.O. Box 2069
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.
Commentary
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.

-8- G8793 12" Double Disc Sander
Unpacking
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.
Piece Inventory
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.
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.
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.

G8793 12" Double Disc Sander -9-
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.
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.
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.
Site Considerations
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.
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.
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.

-10- G8793 12" Double Disc Sander
SECTION 4: ASSEMBLY
Mounting To Stand
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.
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.
Disc Table
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.
Figure 3. Attaching disc table.
Trunnion
Star Knob

G8793 12" Double Disc Sander -11-
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 4. Sandpaper being slipped between the
disc and table.
Figure 5. Removing protective layer.
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.

-12- G8793 12" Double Disc Sander
SECTION 5: ADJUSTMENTS
Tables
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.
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.
Figure 6. Squaring disc table.
Miter Gage
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.
Set the pointer on the miter gauge to 0˚ by loos-
ening the screw holding the pointer in position.
Adjust the pointer and retighten.
Figure 7. Squaring miter gauge to disc.
Tilt Pointer

G8793 12" Double Disc Sander -13-
SECTION 6: OPERATIONS
The cast iron disc accepts 12" diameter cloth or
paper-backed PSA sanding discs. These are
available in a variety of grits. See the current
Grizzly catalog for prices and ordering informa-
tion.
Please review all safety rules for sanders and all
power tools before attempting operation. The
hints listed below are also worth your considera-
tion:
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.
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.
6. Keep your workpiece moving across the
face of the disc to prevent grooves or ruts in
the surface you’re sanding.
The disc table can go from -45˚ to 45˚ relative to
the plane of the sanding surface.
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.
Table Tilt
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.
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
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).
Disc 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.
Figure 8. Disc sanding.
Miter Sanding
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.
Figure 9. Mitering with gauge reversed.
Rotation

G8793 12" Double Disc Sander -15-
SECTION 7: MAINTENANCE
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.
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.
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
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.
General
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.

-16- G8793 12" Double Disc Sander
Dust Ports
The dust port mounts beneath the table, with the
port directed downward, and is attached with four
(4) Phillips®head screws. See Figure 12.
Attaching Disc Guard
Place the disc guard over the disc and use two
Phillips® head screws to hold in place. See Figure 11.
Figure 12. Attaching dust port.
Figure 11. Attaching disc guard.
Attaching Disc
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.
Figure 10. Attaching disc.

G8793 12" Double Disc Sander -17-
The following pages contain general machine
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.
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.
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.
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.
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.
SECTION 8: CLOSURE
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.
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.

-18- G8793 12" 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.
Customer Service #: [phone] • To Order Call: [phone] • Fax #: [phone]
GRIZZLY MODEL G8793 DOUBLE DISC SANDER
MACHINE DATA
SHEET
REVISED 6/00