Powermatic DS20 Service manual

Operating Instructions and Parts Manual
20-inch Disc Sander
Model DS20
Three Phase model shown
Powermatic
427 New Sanford Road
LaVergne, TN 37086 Part No. M-0460226
Ph.: 800-274-6848 Revision H2 03/2015
www.powermatic.com Copyright © 2015 Powermatic

2
Warranty and Service
Powermatic 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
Powermatic branded website.
•Powermatic 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. Powermatic 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. Powermatic 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 Powermatic website.
More Information
Powermatic is constantly adding new products. For complete, up-to-date product information, check with your local
distributor or visit the Powermatic website.
How State Law Applies
This warranty gives you specific legal rights, subject to applicable state law.
Limitations on This Warranty
POWERMATIC 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.
POWERMATIC 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.
Powermatic sells through distributors only. The specifications listed in Powermatic printed materials and on the official
Powermatic website are given as general information and are not binding. Powermatic 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.
Product Listing with Warranty Period
90 Days – Parts; Consumable items
1 Year – Woodworking Machinery used for industrial or commercial purposes
5 Year – Woodworking Machinery
NOTE: Powermatic is a division of JPW Industries, Inc. References in this document to Powermatic also apply to
JPW Industries, Inc., or any of its successors in interest to the Powermatic brand.

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Table of Contents
Warranty and Service..............................................................................................................................2
Table of Contents....................................................................................................................................3
Warning...................................................................................................................................................4
Introduction .............................................................................................................................................6
Specifications..........................................................................................................................................6
Unpacking...............................................................................................................................................7
Installation...............................................................................................................................................7
Attaching Sanding Paper......................................................................................................................7
Mounting the Brake Assembly..............................................................................................................7
Dust Collection.....................................................................................................................................7
Grounding Instructions.............................................................................................................................8
Extension Cords...................................................................................................................................8
On-Off Switch Padlock.........................................................................................................................9
Adjustments ............................................................................................................................................9
Table Movement..................................................................................................................................9
Squaring the Table...............................................................................................................................9
Replacing Abrasive Disc ....................................................................................................................10
Miter Gauge.......................................................................................................................................10
Operation..............................................................................................................................................10
Forward-Reverse Switch (3-Phase)....................................................................................................10
Brake.................................................................................................................................................11
Replacement Parts................................................................................................................................13
Parts List: DS20 Disc Sander.............................................................................................................14
Exploded View: DS20 Disc Sander.....................................................................................................16
Parts List: Brake Assembly (DS20 Disc Sander).................................................................................17
Electrical Connections for DS20 Disc Sander.........................................................................................18

4
Warning
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 the warning labels if they become obscured or removed.
4. This disc sander 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 disc sander, do not use until proper training and
knowledge have been obtained.
5. Do not use this disc sander for other than its intended use. If used for other purposes, Powermatic
disclaims any real or implied warranty and holds itself harmless from any injury that may result from that
use.
6. Always wear approved safety glasses/face shields while using this disc sander. Everyday eyeglasses only
have impact resistant lenses; they are not safety glasses.
7. Before operating this disc sander, remove tie, rings, watches and other jewelry, and roll sleeves up past
the elbows. Remove all loose clothing and confine long hair. Non-slip footwear or anti-skid floor strips are
recommended. Do not wear gloves.
8. Wear ear protectors (plugs or muffs) during extended periods of operation.
9. Do not operate this machine while tired or under the influence of drugs, alcohol or any medication.
10. Make certain the switch is in the OFF position before connecting the machine to the power supply.
11. Make certain the machine is properly grounded.
12. Make all machine adjustments or maintenance with the machine unplugged from the power source.
13. Some dust created by power sanding, sawing, grinding, drilling and other construction activities contain
chemicals known to cause cancer, birth defects or other reproductive harm. Some examples of these
chemicals are:
•Lead from lead based paint.
•Crystalline silica from bricks, cement and other masonry products.
•Arsenic and chromium from chemically treated lumber.
Your risk of exposure varies, depending on how often you do this type of work. To reduce your exposure to
these chemicals, work in a well-ventilated area and work with approved safety equipment, such as face or
dust masks that are specifically designed to filter out microscopic particles.
14. 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.
15. 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.
16. 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.
17. Provide for adequate space surrounding work area and non-glare, overhead lighting.
18. Keep the floor around the machine clean and free of scrap material, oil and grease.
19. Keep visitors a safe distance from the work area. Keep children away.
20. Make your workshop child proof with padlocks, master switches or by removing starter keys.

5
21. Give your work undivided attention. Looking around, carrying on a conversation and “horse-play” are
careless acts that can result in serious injury.
22. Maintain a balanced stance at all times so that you do not fall or lean against the disc or other moving
parts. Do not overreach or use excessive force to perform any machine operation.
23. Support the workpiece with the miter gauge; maintain control of the workpiece at all times.
24. Use the right tool at the correct speed and feed rate. Do not force a tool or attachment to do a job for which
it was not designed. The right tool will do the job better and safer.
25. Use recommended accessories; improper accessories may be hazardous.
26. Maintain tools with care. Follow instructions for lubricating and changing accessories.
27. Turn off the machine before cleaning. Use a brush or compressed air to remove chips or debris — do not
use your hands.
28. Do not stand on the machine. Serious injury could occur if the machine tips over.
29. Never leave the machine running unattended. Turn the power off and do not leave the machine until it
comes to a complete stop.
30. Remove loose items and unnecessary work pieces from the area before starting the machine.
31. After turning switch to “ON,” always allow the disc to come up to full speed before sanding or grinding.
Keep hands clear of the disc.
32. Do not wet grind or polish. Never use a steady stream of water on the workpiece. Only quench the
workpiece in water to cool it.
33. Do not grind or polish magnesium as it may catch on fire.
34. Replace sanding discs when they become loaded and glazed or frayed.
Familiarize yourself with the following safety notices used in this manual:
This means that if precautions are not heeded, it may result in minor injury and/or
possible machine damage.
This means that if precautions are not heeded, it may result in serious injury or possibly
even death.

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Introduction
This manual is provided by Powermatic covering the safe operation and maintenance procedures for a
Powermatic Model DS20 Disc Sander. This manual contains instructions on installation, safety precautions,
general operating procedures, maintenance instructions and parts breakdown. This machine has been
designed and constructed to provide years of trouble free operation if used in accordance with instructions set
forth in this manual. If there are any questions or comments, please contact either your local supplier or
Powermatic. Powermatic can also be reached at our web site: www.powermatic.com.
Specifications
Model Number.................................................................................... DS20.................................................DS-20
Stock Number ............................................................................... 1791276.............................................1791264
Motor and Electricals:
Horsepower ...................................................................................... 2HP....................................................3HP
Phase..............................................................................................single.........................................................3
Voltage..................................................................................... 230V only.................230/460V (prewired 230V)
Frequency........................................................................................60Hz...................................................60Hz
FLA (full load amperage)..................................................................14 A.............................................9.8/4.9 A
Motor speed (RPM) ......................................................................... 1720...................................................1720
Recommended circuit*......................................................................30 A...............................................20/15 A
* subject to local and national electrical codes
Disc:
Disc Diameter (in.)............................................................................... 20.......................................................20
Disc Speed (RPM)........................................................................... 1720...................................................1720
Table:
Table Tilt (deg.)................................................................30 up, 45 down.................................. 30 up, 45 down
Table Size (in.).................................................................27-1/2 x 10-1/2...................................27-1/2 x 10-1/2
Table Surface from Floor, minimum height (in.) ..........................28-3/16...............................................28-3/16
Table Surface from Floor, maximum height (in.) ...........................35-7/8.................................................35-7/8
Distance Between Disc and Table (in.)............................................. 0.20....................................................0.20
Distance Between Mounted Abrasive and Table (in.)....................... 0.17....................................................0.17
Dust Collection:
Dust Port Diameter (in.)......................................................................... 4.........................................................4
Dust Collection Minimum CFM Required........................................... 600.....................................................600
Dimensions and Weights:
Overall Size (LxWxH)(in.) ...............................................31 x 28 x 48-1/2................................. 31 x 28 x 48-1/2
Footprint (LxW)(in.)..........................................................22-1/2 x 22-1/2...................................22-1/2 x 22-1/2
Net Weight, approximate (lbs.) .......................................................... 426.....................................................426
Shipping Weight, approximate (lbs.).................................................. 529.....................................................529
The above specifications were current at the time this manual was published, but because of our policy of
continuous improvement, Powermatic reserves the right to change specifications at any time and without prior
notice, without incurring obligations.

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Unpacking
Open shipping container and check for shipping
damage. Report any damage immediately to your
distributor and shipping agent. Do not discard any
shipping material until the Disc Sander is installed
and running properly. Read the instruction manual
thoroughly for assembly, maintenance and safety
instructions.
Contents of shipping container:
1 DS20 Disc Sander
1 20” Abrasive Paper
1 Brake Assembly
1 Instruction and Parts Manual
1 Warranty Card
Installation
Tools required for assembly:
6mm hexkey (“Allen wrench”)
Exposed metal areas of the Disc Sander have
been factory coated with a protectant. This should
be removed with a soft cloth dampened with a
cleaner/degreaser, or kerosene. Do not use
gasoline, acetone or lacquer thinner for this
purpose. Do not get solvents near plastic or rubber
parts, and do not use an abrasive pad because it
may scratch metal surfaces.
1. Remove the bolts holding the Disc Sander to
the pallet, and use an assistant or a hoist to
slide the machine off the pallet.
2. Install the machine in a level, well-lighted
location. Secure it to the floor with good quality
anchor bolts (not provided).
3. Leave enough space around the work area for
loading and off-loading stock and general
maintenance.
Attaching Sanding Paper
NOTE: It is recommended that you first inspect
certain measurements at the disc/table area and
make any needed adjustments (e.g., squaring the
table, disc adjustment, miter gauge adjustment).
This is easier to do against the bare surface of the
disc, before the sanding paper is attached. See the
appropriate sections below.
1. Make sure the surface of the disc is clean and
free of grease or debris.
2. Lower the table all the way and push back the
guard (refer to Figure 6).
3. Remove the backing from the sanding paper to
expose the adhesive, and carefully apply the
sanding paper to the disc on the machine.
Press firmly, starting from the center and
working outward, to remove any air bubbles.
Mounting the Brake Assembly
Attach the brake assembly as shown in Figure 1,
using the two socket head cap screws, lock
washers, and flat washers which are pre-installed
on the machine. Use a 6mm hex key to tighten.
Figure 1
Dust Collection
The use of a dust collection system with the Disc
Sander is strongly recommended. It will maintain
shop cleanliness, and help prevent possible health
hazards caused by wood dust.
Make sure the capacity of the dust collector is
suitable for this size machine. Minimum 600 cubic
feet per minute is recommended.
The Disc Sander has a 4” diameter dust port
(Figure 2). Slide the hose of your dust collector
over the outlet, and secure with a hose clamp.
NOTE: Dryer vent hose is not acceptable for this
purpose.
Figure 2
hose not included

8
Grounding Instructions
Electrical connections must be
made by a qualified electrician in compliance
with all relevant codes. This machine must be
properly grounded to help prevent electrical
shock and possible fatal injury.
This machine 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 to the operator.
Improper connection of the equipment-grounding
conductor can result in a risk of electric shock. The
conductor, with insulation having an outer surface
that is green with or without yellow stripes, is the
equipment-grounding conductor. If repair or
replacement of the electric cord or plug is
necessary, do not connect the equipment-
grounding conductor to a live terminal.
Single Phase Connections
The single phase Sander is factory wired for 230
volts only. It is not supplied with a plug. You may
either install a UL/CSA-listed plug suitable for 230
volt operation, or “hard-wire” the Sander directly to
a service panel (make sure a disconnect is
available for the operator).
It is recommended that the single phase Sander be
connected to a grounded and dedicated, minimum
30 amp circuit with a 30 amp circuit breaker or time
delay fuse. Local codes take precedence over
recommendations.
Disc Rotation (Single Phase Only)
The single phase model can be wired to allow disc
rotation in either direction. If you wish to change
disc direction, refer to the diagram inside the motor
junction box. This diagram is repeated in Figure 3.
Figure 3
(Single Phase model disc reversal)
Three Phase Connections
The three phase Sander is factory wired for 230
volts. It is not supplied with a plug. You may either
install a UL/CSA-listed plug suitable for 230 volt
operation, or “hard-wire” the Band Saw directly to a
service panel (make sure a disconnect is available
to the operator).
The three phase Band Saw may be converted to
460 volt operation. Re-connect the motor leads
according to the diagram inside the motor junction
box. (Similar diagrams may be found at the back of
this manual; however, diagrams on the machine
itself should take precedence.)
It is recommended that the three phase 230V
Sander be connected to a grounded and
dedicated, minimum 20 amp circuit with a 20 amp
circuit breaker or time delay fuse. It is
recommended that the three phase 460V sander
be connected to a grounded and dedicated,
minimum 15 amp circuit with a 15 amp circuit
breaker or time delay fuse. Local codes take
precedence over recommendations.
If the Sander is to be hard-wired, make sure the
fuses have been removed or the breakers have
been tripped in the circuit to which the Sander will
be connected. Place a warning placard on the fuse
holder or circuit breaker to prevent it being turned
on while the machine is being wired.
Make sure the voltage of your power supply
matches the specifications on the motor plate of
the Disc Sander.
Extension Cords
If an extension cord is necessary make sure the
cord rating is suitable for the amperage listed on
the machine's motor plate. An undersized cord will
cause a drop in line voltage resulting in loss of
power and overheating.
The chart in Figure 4 shows the correct size cord to
use based on cord length and motor plate amp
rating. If in doubt, use the next heavier gauge. The
smaller the gauge number the heavier the cord.
Recommended Gauges (AWG) of Extension Cords
Amps
Extension Cord Length *
25
feet 50 feet 75 feet 100 feet 150 feet 200 feet
< 5 16 16 16 14 12 12
5 to 8 16 16 14 12 10 NR
8 to 12 14 14 12 10 NR NR
12 to 15 12 12 10 10 NR NR
15 to 20 10 10 10 NR NR NR
21 to 30 10 NR NR NR NR NR
*based on limiting the line voltage drop to 5V at 150% of the
rated amperes.
NR: Not Recommended. Figure 4

9
On-Off Switch Padlock
The sander is equipped with a push-button switch
that will accept a safety padlock (not included). See
Figure 5. To safeguard your machine from
unauthorized operation and accidental starting by
young children, the use of a padlock is highly
recommended.
Figure 5
Adjustments
Table Movement
The work table (A, Figure 6) can be tilted 30
degrees forward and 45 degrees backward.
Figure 6
1. Loosen the handle (B, Figure 6) and rotate the
handwheel (C, Figure 6) clockwise to tilt table
backward, and counterclockwise to tilt table
forward. The pointer on the trunnion scale (D,
Figure 6) indicates the angle.
2. When table is positioned, re-tighten handle (B,
Figure 6).
The table can also be raised or lowered on the
column:
1. Loosen the lock handle (E, Figure 7) and
adjust the table height by rotating the
handwheel (F, Figure 7); clockwise to lower
the table, counterclockwise to raise it.
2. When finished, re-tighten lock handle (E,
Figure 7).
Figure 7
Squaring the Table
1. Verify the accuracy of the scale pointer by
positioning the table in horizontal position, and
placing a square on the table and flush against
the disc. (It is easier to do this without an
abrasive disc attached.) See Figure 8.
2. Adjust the table until the square is flush
against both surfaces.
3. If required, adjust the pointer to the zero mark,
and retighten the screw.
Figure 8

10
Replacing Abrasive Disc
The DS20 accepts standard 20” diameter cloth or
paper-back sanding discs. We recommend 60 grit
for coarse or rough sanding, 80 grit for general
purpose medium duty sanding, and 100 grit for fine
sanding.
1. Lower the table as far as possible, and push
back the guard. See Figure 6.
2. Use a putty knife to remove the old abrasive
from the disc. Clean the disc with solvent and
allow it to dry.
3. Mount the new sanding paper. Sanding paper
is available in various forms, such as adhesive
backed discs and pressure-sensitive discs.
4. Raise the table, and pull the guard back over
the disc before operating the sander.
Miter Gauge
The miter gauge is equipped with individually
adjustable index stops at 90 degrees and 45
degrees right and left. The index stops can be
adjusted by loosening the hex nut (G, Figure 9)
and turning the screw (H, Figure 9).
Check the accuracy of the 90-degree stop by
placing a square against the miter gauge and the
disc, as shown in Figure 10.
To operate the miter gauge, loosen knob (J, Figure
9) and move the body of the miter gauge (K, Figure
9) to the desired angle. Re-tighten knob before
sanding operation.
The miter gauge body is set to stop at 0 degrees
and 45 degrees left or right. To move the gauge
body beyond these points, the stop (L, Figure 9)
must be flipped out of the way.
Figure 9
Operation
Raise the table into position. After turning on the
sander, allow the disc to come up to full speed
before beginning to sand.
Figure 10
Slide the miter gauge into the table slot. The miter
gauge can be used from either direction to facilitate
the position of the workpiece.
Use both hands to hold the workpiece against the
miter gauge and sanding disc.
Keep the workpiece on the side of the disc that is
rotating downward (see Figure 11). This will
prevent the workpiece being thrown upward by the
rotational force of the disc.
When sanding long workpieces, use supports
which are the same height as the sander table.
Figure 11
Forward-Reverse Switch (3-Phase)
The three phase model of the DS20 has a
Forward-Reverse switch (Figure 12). When
changing direction with the Forward-Reverse
switch, turn the lever to the OFF position and allow
the disc to come to a complete stop. (Use the
brake for immediate stop). Then turn the lever to
the opposite direction, and allow the disc to come
up to speed.

11
Figure 12
(3 Phase model only)
Brake
Pull the brake handle until the pad contacts the
rotating disc.
Apply the brake only when the
switch is OFF (On the three-phase model, only
when the main switch is OFF, or the
Forward/Reverse switch is OFF). Damage to the
machine can occur if the brake is applied while
the switch is ON.
Maintenance
Before doing any maintenance
on the machine, disconnect it from the
electrical supply by pulling out the plug or
switching off the main switch! Failure to
comply may cause serious injury.
The DS20 Sander requires minimal maintenance.
Periodically, make sure the rack and the trunnions
on both sides of the table (Figure 13) are lubricated
with a good grade, non-hardening grease.
Figure 13
The table surface must be kept clean and free of
rust for best results. If rust appears, remove it
using a mixture of household ammonia, a good
commercial detergent and #000 steel wool.
Alternatively, commercial rust removers can be
found at many hardware stores.
Apply a light, protective coating over the table,
such as paste wax. Products in aerosol form are
also available in hardware stores and supply
catalogs. Whatever method is chosen, the coating
should protect the metal and provide a smooth
surface, without staining the workpiece.
If the power cord is worn, cut or damaged in any
way, have it replaced immediately.

12
Troubleshooting
Trouble Probable Cause Remedy
Machine will not
start/restart or
repeatedly trips
circuit breakers or
blows fuses.
Machine not connected to
power source. Verify machine is connected to power.
Fuse blown, or circuit
breaker tripped. Replace fuse, or reset circuit breaker.
Cord damaged. Replace cord.
Extension cord too light or
too long. Use adequate size extension cord.
Building circuit breaker trips
or fuse blows.
Verify that sander is on a circuit of correct size. If
circuit size is correct, there is probably a loose
electrical lead.
Loose electrical connections.
Go through all the electrical connections on the edge
sander including motor connections, verifying the
tightness of each. Look for any signs of electrical
arcing which is a sure indicator of loose connection or
circuit overload.
Switch or motor failure (how
to distinguish).
If you have access to a voltmeter, you can separate a
switch failure from a motor failure by first, verifying
incoming voltage at 220+/-10% and second, checking
the voltage between switch and motor at 220+/-10%.
If incoming voltage is incorrect, you have a power
supply problem. If voltage between switch and motor
is incorrect, you have a switch problem. If voltage
between switch and motor is correct, you have a
motor problem.
Motor failure.
If electric motor is suspect, you have two options:
Have a qualified electrician test the motor for function
or remove the motor and take it to a qualified electric
motor repair shop and have it tested.
On/Off switch failure.
(or Forward/Reverse switch
on 3 phase model).
If the switch is suspect, you have two options: Have a
qualified electrician test the switch for function, or
purchase a new switch and establish if that was the
problem on changeout.
Disc won’t come up
to speed. Extension cord too light or too long. Use adequate size extension cord.
Low (incoming) voltage. Contact qualified electrician.
Excessive bite, or feed
pressure too great. Allow sanding disc to cut freely, do not force.
Excessive
replacement of
sanding paper.
Too much pressure being
used during cuts. Reduce pressure.
Not using full width of belt. Stroke across the belt using full width.
Machine vibrates
excessively. Sander base not level with floor. Shim if necessary.
Not secured to the floor. Use lag screws through holes in base to secure
machine to the floor.
Improper motor mounting. Check and adjust mounting.
Sanding marks on
workpiece. Sanding paper too coarse for required finish. Use proper grit. Coarser grits for stock removal, and finer grits for finish work.
Workpiece sanded across
grain. When surface sanding, use fine sanding disc paper then finish by hand, working in direction of grain.
Sanding grains
quickly rub off
paper.
Sanding paper has lost its
original properties. Do not store sanding paper in extremely dry or high- temperature areas. Do not fold sanding disc papers,
store them flat.

13
Trouble Probable Cause Remedy
Sanding paper
becomes glazed. Sanding painted surface. Use open-end grain/flint sanding paper.
Wood is wet or gummy. No cure. Use different stock.
Burn marks on
workpiece. Wrong sanding paper surface. Use coarser grit for stock removal.
Feed pressure too great. Do not force workpiece into disc. Use just enough
pressure, and let the sanding disc do the work.
Sanding paper
burns, or clogs
quickly.
Too much pressure, sanding
disc biting too deeply into
workpiece.
Adjust for slight sanding action and make several
passes.
Workpiece pulled
from hand. No support for workpiece. Use miter gauge. Keep workpiece firmly down against table.
Sanded edge is not
square. Result of freehand sanding. Keep workpiece flat on table at all times when a square edge is desired. Use miter gauge to ensure
workpiece is square with sanding disc.
Table scale inaccurate. Check table alignment to disc with a machinist’s
square. It should be 90 degrees. Adjust pointer and
table angle if necessary.
Replacement Parts
Replacement parts are listed on the following pages. To order parts or reach our service department, call 1-
800-274-6848, Monday through Friday (see our website for business hours, www.powermatic.com). Having the
Model Number and Serial Number of your machine available when you call will allow us to serve you quickly
and accurately.

14
Parts List: DS20 Disc Sander
Index No. Part No. Description Size Qty
1...............6295560...................Base............................................................ .........................................1
2...............6295561...................Column........................................................ .........................................1
3...............6295562...................Rack............................................................ .........................................1
4...............6295563...................Socket Head Cap Screw.............................. 5/16”-18 x 1/2"..................2
5...............6295564...................Column Support .......................................... .........................................1
6...............6295565...................Motor Base.................................................. .........................................1
7...............6295566...................Stud ............................................................ .........................................1
8...............6295567...................Flat Washer................................................. 1/2"...................................1
9...............6295568...................Spring Washer............................................. 1/2"...................................1
10.............6295569...................Hex Nut....................................................... 1/2"...................................1
11.............6295570...................Worm Gear.................................................. .........................................1
12.............6295571...................Bushing....................................................... .........................................1
13.............6295572...................Flat Washer................................................. .........................................1
14.............6295573...................Lock Handle Assembly................................ .........................................1
15.............6295574...................Bushing....................................................... .........................................1
16.............6295575...................Table Lifting Worm ...................................... .........................................1
17.............6295576...................Roll Pin........................................................ 3 x 20mm..........................2
18.............6295577...................Shaft ........................................................... .........................................1
19.............6295578...................Shaft Support Bracket.................................. .........................................1
20.............6295579...................Spring Washer............................................. 1/4”.................................10
21.............6295580...................Hex Head Screw ......................................... 1/4"-20 x 1"..................... 10
22.............6295581...................Handwheel .................................................. .........................................1
23.............6295582...................Handle......................................................... .........................................2
24.............6295583...................Set Screw.................................................... 5/16"-18 x 3/8"..................4
25.............6295584...................Hex Head Screw ......................................... 5/16"-18 x 1-3/4"...............2
26.............6295585...................Hydraulic Cylinder ....................................... .........................................1
27.............6295586...................Cylinder Head.............................................. .........................................2
28.............6295587...................Cylinder Fitting ............................................ .........................................2
29.............6295588...................E-Ring......................................................... .........................................2
30.............6295589...................Wire Protector............................................. .........................................1
31.............6295590...................Motor........................................................... 2HP, 1Ph, 230V................1
.................6295591...................Motor........................................................... 3HP, 3Ph, 230/460V.........1
.................DS20-SC .................Start Capacitor (not shown) ......................... 500MFD, 250VAC.............1
.................DS20-RC.................Run Capacitor (not shown) .......................... 40μf, 250VAC...................1
.................DS20-MF.................Motor Fan and Cover (not shown)................ .........................................1
32.............6295592...................Hex Head Screw ......................................... 3/8"-16 x 1-1/2".................3
33.............6295593...................Flat Washer................................................. 3/8"................................. 16
34.............6295594...................Spring Washer............................................. 3/8"................................. 15
35.............6295595...................Hex Nut....................................................... 3/8"...................................4
36.............6295596...................Key..............................................................5 x 5 x20mm.....................1
37.............6295597...................Hub............................................................. .........................................1
38.............6295598...................Set Screw.................................................... 3/8"-16 x 3/8"....................2
39.............6295602...................Disc............................................................. .........................................1
40.............6295600...................Disc Insert................................................... .........................................1
41.............6295601...................Cap Screw...................................................5/16"-18 x 1".....................1
42.............DS20-AD .................Abrasive Disc .............................................. 20”Dia., 100 Grit ...............1
43.............6295603...................Disc Guard Bracket ..................................... .........................................2
44.............6295604...................Flat Washer................................................. 1/4"...................................2
45.............6295605...................Hex Head Screw ......................................... 1/4"-20 x 1-1/4".................2
46.............6295606...................Lock Nut...................................................... 1/4"...................................2
47.............6295607...................Hex Head Screw ......................................... 1/4"-20 x 5/8"....................2
48.............6295608...................Hex Nut....................................................... 1/4"...................................3
49.............6295609...................Disc Guard Arm (R)..................................... .........................................1
50.............6295610...................Disc Guard Arm (L)...................................... .........................................1
51.............6295611...................Disc Guard.................................................. .........................................1
52.............6295612...................Solid Segment............................................. .........................................1
53.............6295613...................Hex Head Screw ......................................... 3/8"-16 x 1-3/4".................8

15
Index No. Part No. Description Size Qty
54.............6295614...................Pilot, Right................................................... .........................................1
55.............6295615...................Phillip Head Screw ...................................... 1/4"-20 x 1/2"....................4
56.............6295616...................Spring Pin....................................................5 x 20mm..........................5
57.............6295617...................Pilot, Left..................................................... .........................................1
58.............6295618...................Gear Segment............................................. .........................................1
59.............6295619...................Pointer......................................................... .........................................1
60.............6295620...................Round Head Screw ..................................... .........................................1
61.............6295621...................Trunnion...................................................... .........................................1
62.............6295622...................Hex Head Screw ......................................... 3/8"-16 x 1".......................4
63.............6295623...................Table........................................................... .........................................1
64.............6295624...................Bolt.............................................................. .........................................1
65.............6295625...................Roll Pin........................................................ 3 x 16mm..........................1
66.............6295626...................Table Lock Handle....................................... .........................................1
67.............6295627...................Table TiltingWorm ...................................... .........................................1
68.............6295628...................Shaft ........................................................... .........................................1
69.............6295629...................Handwheel .................................................. .........................................1
70.............6295630...................Hex Nut....................................................... 3/8"...................................2
71.............6295631...................Gear Housing.............................................. .........................................1
72.............6295632...................Scale........................................................... .........................................1
73.............6295633...................Hex Head Screw ......................................... 3/16"-24 x 3/4"..................2
74.............6295634...................Hex Nut....................................................... 3/16".................................2
75.............6295635...................Switch Plate................................................ .........................................1
76.............6295636...................Switch, Fwd/Rev (3 Phase only).................. .........................................1
77.............6295637...................Round Head Screw ..................................... 3/16"-24 x 3/4"..................9
78.............6295638...................Switch Cover............................................... .........................................1
79.............6295639...................Switch, On/Off............................................. .........................................1
80.............6295640...................Switch Faceplate......................................... .........................................1
81.............6295641...................Tap Screw................................................... .........................................2
82.............6295642...................Set Screw.................................................... 1/4"-20 x 1".......................1
83.............6295643...................Power Cord................................................. 14AWG x 3C SJT 300V ....1
83-1..........6295643A ................Power Cord................................................. 14AWG x 4C ST 600V......1
84.............6295644...................Motor Wire................................................... 14AWG x 3C SJT 300V ....1
84-1..........6295644A ................Motor Wire................................................... 14AWG x 4C ST 600V......1
85.............6295645...................Switch Wire (3 Phase only).......................... 14AWG x 4C ST 600V......1
86.............6295646...................Dust Chute.................................................. .........................................1
87.............6295647...................Cap Screw...................................................1/4"-20 x 1/4"....................2
.................6295663...................Miter Gauge Assembly (includes index # 88 through 98)........................1
88.............6295648...................Guide Bar.................................................... .........................................1
89.............6295649...................Guide Disc................................................... .........................................1
90.............6295650...................Phillip Head Screw ...................................... 1/4"-20 x 1/4"....................1
91.............6295651...................Pointer......................................................... .........................................1
92.............6295652...................Set Screw.................................................... 1/4"-20 x 1/4"....................1
93.............6295653...................Stop ............................................................ .........................................1
94.............6295654...................Roll Pin........................................................ 3 x 6mm ...........................1
95.............6295655...................Miter Gauge Body........................................ .........................................1
96.............6295656...................Knob ........................................................... .........................................1
97.............6295657...................Round Head Screw .....................................M4 x 0.7 x 20....................3
98.............6295658...................Hex Nut....................................................... M4....................................3
99.............6295659...................Hex Nut....................................................... 5/16".................................2
100...........6295660...................Sponge........................................................ .........................................1

16
Exploded View: DS20 Disc Sander

17
Parts List: Brake Assembly (DS20 Disc Sander)
Index No. Part No. Description Size Qty
.................DS20-200 ................Brake Assembly (includes index #1 through 12).......................................
1...............DS20-201 ................Brake Pad.............................................................................................1
2...............TS-2311081.............Hex Nut.............................................................M8..............................1
3...............DS20-203 ................Push Body.............................................................................................1
4...............TS-2361061.............Lock Washer......................................................M6..............................4
5...............TS-1503041.............Socket Head Cap Screw.....................................M6 x 16......................4
6...............DS20-206 ................Bracket..................................................................................................1
7...............TS-1540031.............Hex Nut..............................................................M5..............................1
8...............TS-2205301.............Hex Cap Screw..................................................M5 x 30......................1
9...............DS20-209 ................Spring....................................................................................................1
10.............TS-1550061.............Flat Washer........................................................M8..............................2
11.............TS-2361081.............Lock Washer......................................................M8..............................2
12.............TS-1504051.............Socket Head Cap Screw.....................................M8 x 25.....................2

18
Electrical Connections for DS20 Disc Sander

19
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20
427 New Sanford Road
LaVergne, Tennessee 37086
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