Powermatic WB-25, WB-43, WB-37 User Manual
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Operating Instructions and Parts Manual
Wide Belt Sanders
Models WB-25, WB-37, WB-43
Powermatic
427 New Sanford Rd.
LaVergne, TN 37086 Part No. M-1790825
Ph.: 800-274-6848 Revision D1 03/2014
www.powermatic.com Copyright © 2014 Powermatic
model WB-37 shown
1.0 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 Co vered
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.
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 initia l p u rch a s e whe n 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 Informa tion
Powermatic is constantly adding new products. For complete, up-to-date product information, check with your local
distributor or visit the Powermatic website.
How S tate 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 – Motors, Machine Accessories
2 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.
2
2.0 Table of Contents
Section Page
1.0 Warranty and Service ....................................................................................................................... 2
2.0 Table of Contents ............................................................................................................................. 3
3.0 Safety warnings ................................................................................................................................ 5
4.0 Introduction ....................................................................................................................................... 7
5.0 Specifications ................................................................................................................................... 7
6.0 Unpacking ........................................................................................................................................ 8
6.1 Contents of Shipping Container ..................................................................................................... 8
7.0 Assembly .......................................................................................................................................... 9
7.1 Air Supply Connection ................................................................................................................... 9
7.2 Dust Collection .............................................................................................................................. 9
7.3 Installing/Replacing Sanding Belt................................................................................................. 10
8.0 Electrical ......................................................................................................................................... 10
8.1 Grounding Instructions ................................................................................................................ 10
8.2 230 Volt Operation ...................................................................................................................... 11
8.3 460 Volt Conversion .................................................................................................................... 12
8.4 Extension cords ........................................................................................................................... 12
9.0 Adjustments .................................................................................................................................... 12
9.1 Sanding Belt Tracking and Oscillation
9.2 Oscillation Air Flow ...................................................................................................................... 13
9.3 Oscillation Speed ........................................................................................................................ 13
9.4 Platen Position ............................................................................................................................ 14
9.5 Replacing Graphite and Felt Pad ................................................................................................. 14
9.6 V-Belt Tension and Replacement ................................................................................................ 14
9.7 Conveyor Belt Tension ................................................................................................................ 15
9.8 Conveyor Belt Tracking ............................................................................................................... 15
9.9 Feed Rate ................................................................................................................................... 16
9.10 Pressure Bar Adjustment ........................................................................................................... 16
9.11 Table Parallelism ....................................................................................................................... 17
10.0 Operating Controls ........................................................................................................................ 18
10.1 Amperage Meter ....................................................................................................................... 18
10.2 LED Controller and Keypad ....................................................................................................... 18
11.0 Operation ...................................................................................................................................... 19
11.1 Braking System ......................................................................................................................... 19
12.0 Maintenance ................................................................................................................................. 20
13.0 Dust Port Layout ........................................................................................................................... 20
14.0 Troubleshooting the Sander .......................................................................................................... 21
15.0 Troubleshooting the LED Unit ....................................................................................................... 23
16.0 Replacement Parts ....................................................................................................................... 23
16.1.1 Base and Motor Assembly – Model WB-25 ONLY ................................................................... 24
16.1.2 Parts List: Base and Motor Assembly – Model WB-25 ............................................................. 25
16.2.1 Base and Motor Assembly – Model WB-37 ONLY ................................................................... 26
16.2.2 Parts List: Base and Motor Assembly – Model WB-37 ............................................................. 27
16.3.1 Base and Motor Assembly – Model WB-43 ONLY ................................................................... 28
16.3.2 Parts List: Base and Motor Assembly – Model WB-43 ............................................................. 29
16.4.1 Upper Cabinet Assembly – Model WB-25 ONLY ..................................................................... 30
16.4.2 Parts List: Upper Cabinet Assembly – Model WB-25 ............................................................... 31
16.5.1 Upper Cabinet Assembly – Models WB-37, WB-43 ................................................................. 32
16.5.2 Parts List: Upper Cabinet Assembly – Model WB-37 ............................................................... 33
16.5.3 Parts List: Upper Cabinet Assembly – Model WB-43 ............................................................... 33
16.6.1 Table Raising Assembly – Models WB-25, WB-37, WB-43...................................................... 34
16.6.2 Parts List: Table Raising Assembly – Model WB-25 ................................................................ 35
16.6.3 Parts List: Table Raising Assembly – Model WB-37 ................................................................ 36
16.6.4 Parts List: Table Raising Assembly – Model WB-43 ................................................................ 37
16.7.1 Table and Conveyor Belt Assembly – Models WB-25, WB-37, WB-43..................................... 39
16.7.2 Parts List: Table and Conveyor Belt Assembly – Model WB-25 ............................................... 40
16.7.3 Parts List: Table and Conveyor Belt Assembly – Model WB-37 ............................................... 41
16.7.4 Parts List: Table and Conveyor Belt Assembly – Model WB-43 ............................................... 42
........................................................................................... 12
3
16.8.1 Pressure Bar Assembly – Models WB-25, WB-37, WB-43 ...................................................... 43
16.8.2 Parts List: Pressure Bar Assembly – Model WB-25 ................................................................. 43
16.8.3 Parts List: Pressure Bar Assembly – Model WB-37 ................................................................. 44
16.8.4 Parts List: Pressure Bar Assembly – Model WB-43 ................................................................. 44
16.9.1 Platen Assembly – Model WB-25 only .................................................................................... 45
16.9.2 Parts List: Platen Assembly – Model WB-25 ........................................................................... 45
16.10.1 Platen Assembly – Models WB-37, WB-43............................................................................ 47
16.10.2 Parts List: Platen Assembly – Model WB-37 ......................................................................... 47
16.10.3 Parts List: Platen Assembly – Model WB-43 ......................................................................... 48
16.11.1 Air Regulator Assembly – Models WB-25, WB-37, WB-43..................................................... 50
16.11.2 Parts List: Air Regulator Assembly – Model WB-25 ............................................................... 50
16.11.3 Parts List: Air Regulator Assembly – Model WB-37 ............................................................... 51
16.11.4 Parts List: Air Regulator Assembly – Model WB-43 ............................................................... 52
16.12.1 Sanding Belt and Accessories – Models WB-25, WB-37, WB-43 ........................................... 53
16.12.2 Parts List: Sanding Belt and Accessories – Model WB-25 ..................................................... 54
16.12.3 Parts List: Sanding Belt and Accessories – Model WB-37 ..................................................... 54
16.12.4 Parts List: Sanding Belt and Accessories – Model WB-43 ..................................................... 54
16.13.1 Tension Roller Assembly – Models WB-25 and WB-37 ONLY ............................................... 55
16.13.2 Parts List: Tension Roller Assembly – Model WB-25 ............................................................. 56
16.13.3 Parts List: Tension Roller Assembly – Model WB-37 ............................................................. 57
16.14.1 Tension Roller Assembly – Model WB-43 ONLY ................................................................... 59
16.14.2 Parts List: Tension Roller Assembly – Model WB-43 ............................................................. 60
16.15.1 Electrical Box Assembly – Models WB-25 and WB-37........................................................... 62
16.15.2 Parts List: Electrical Box Assembly – Model WB-25 .............................................................. 63
16.15.3 Parts List: Electrical Box Assembly – Model WB-37 .............................................................. 64
16.16.1 Electrical Box Assembly – Model WB-43 ONLY .................................................................... 65
16.16.2 Parts List: Electrical Box Assembly – Model WB-43 .............................................................. 66
17.0 Electrical Connections................................................................................................................... 67
17.1 Models WB-25 and WB-37 ONLY .............................................................................................. 67
17.2 Model WB-43 ONLY .................................................................................................................. 68
4
3.0 Safety warnings
1. Read and understand the entire owner’s manual before attempting assembly or operation.
2. Read and understand the warnings posted on the machine and in this manual. Failure to comply with
all of these warnings may cause serious injury.
3. Replace the warning labels if they become obscured or removed.
4. This 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 sander, do not use until proper training
and knowledge have been obtained.
5. Do not use this 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 sander. Everyday eyeglasses only
have impact resistant lenses; they are not safety glasses.
7. Before operating this 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. Steel toed shoes are recommended because heav y parts
can fall off the conveyor table onto feet.
8. Wear ear protectors (plugs or muffs) during extended periods of operation.
9. 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.
10. Do not operate this machine while tired or under the influence of drugs, alcohol or any medication.
11. Make certain the switch is in the OFF position before connecting the machine to the power supply.
12. Make certain the machine is properly grounded.
13. 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.
14. Keep safety guards in place at all times when the machine is in use. If removed for maintenance
purposes, use extreme caution and replace the guards immediately.
15. Check damaged parts. Before further use of the machine, a guard or other part that is damaged
should be carefully checked to determine that it will operate properly and perform its intended
function. Check for alignment of moving parts, binding of moving parts, breakage of parts, mounting
and any other conditions that may affect its operation. A guard or other part that is damaged should
be properly repaired or replaced.
16. Provide for adequate space surrounding work area and non-glare, overhead lighting.
17. Keep the floor around the machine clean and free of scrap material, oil and grease.
18. Keep visitors a safe distance from the work area. Keep children aw ay.
5
3.0 Safety w arnings
19. Make your workshop child proof with padlocks, master switches or by removing starter keys.
20. Give your work undivided attention. Looking around, carrying on a conversation and “horse-play” are
careless acts that can result in serious injury.
21. Remove loose items and unnecessary work pieces from the area before starting the machine.
22. Maintain a balanced stance at all times so that you do not fall or lean against the conveyor belt or
other moving parts. Do not overreach or use excessive force to perform any machine operation.
23. Keep hands clear while feeding workpieces onto the conveyor table. The workpiece will be forced
down as it begins to feed into the machine, causing a pinching action between workpiece and
conveyor table.
24. Stand to one side of the conveyor table and do not let anyone else stand in line with the table while a
workpiece is being fed through the machine.
25. Do not attempt to sand stock shorter than 12 inches long without butting a board of equal thickness
behind it to help it through the machine. Do not sand stock less than 1/8” thick.
26. Never reach into a running machine. Turn off and disconnect from power source before attempting to
retrieve parts from within the machine.
27. 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.
28. Use recommended accessories; improper accessories may be hazardous.
29. Turn off the machine and disconnect from power before cleaning. Use a brush or compressed air to
remove chips or debris — do not use your hands.
30. Do not stand on the machine. Serious injury could occur if the machine tips over.
31. Never leave the machine running unattended. Turn the power off and do not leave the machine until
all parts come to a complete stop.
Familiariz e you rself with the following safety no tices 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.
- - SAVE THESE INSTRUCTIONS - -
6
4.0 Introduction
This manual is provided by Powermatic covering the safe operation and maintenance procedures for a
Powermatic WB Series Wide Belt 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.
5.0 Specifications
Model Number ............................................ WB-25 ................................ WB-37 ............................. WB-43
Stock Number.......................................... 1790825 ............................. 1790837 ...........................1790843
Working Width (in.) ............................................ 25 ....................................... 37 .................................... 43
Maximum Stock Thickness (in.) ........................... 6 .........................................6 ...................................... 6
Minimum Stock Thickness (in.) ......................... 1/8 ...................................... 1/8 ................................... 1/8
Minimum Board Length (in.) ............................... 12 ....................................... 12 .................................... 12
Table Height from Floor (in.) ......... 31-3/8 to 37-3/8 .................. 31-3/8 to 37-3/8 ................31-3/8 to 37-3/8
Main Drive Motor ................ 15HP, 3Ph, 230/460V* ........20HP, 3Ph, 230/460V* ..... 25HP, 3Ph, 230/460V*
Power Feed Motor .................................. 1HP, 3Ph ............................ 1HP, 3Ph ......................... 2HP, 3Ph
Table Hoist Motor ................................ 1/4HP, 3Ph ......................... 1/4HP, 3Ph ...................... 1/4HP, 3Ph
Sanding Belt Size (in.) ................................. 25x75 ................................. 37x75 ...............................43x75
Dust Ports ................................ two @ 5” diameter ............three @ 5” diameter ......... three @ 5” diameter
Dust Collection CFM Required ......................... 800 ................................... 1600 ................................ 1900
Required Air Pressure (PSI)...................... 75 to 80 .............................. 75 to 80 ........................... 75 to 80
Overall Dimensions (LxWxH/in.) ......... 53 x 45 x 72 ........................53 x 58 x 72 ..................... 53 x 65 x 72
Gross Weight (lbs.) ....................................... 1,760 .................................. 2,090 ............................... 2,530
Net Weight (lbs.) ........................................... 1,650 .................................. 1,970 ............................... 2,400
* NOTE: The sander is pre-wired 230V. Conversion to 460V requires the purchase and installation of two
overload relays. See parts list for stock numbers.
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.
7
6.0 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 sander is
installed and running properly.
Compare the contents of your container with the
following parts list to make sure all parts are
intact. Missing parts, if any, should be reported
to your distributor. Read this instruction manual
thoroughly for assembly, maintenance and
safety instructions.
6.1 Contents of Shi pping Container
1 Sander
2 Sanding belts (100 and 180 grit)
1 Felt pad
1 Graphite strip
1 Tool box containing:
1 Door key
1 Platen pull hook
1 Adjusting rod
2 Limit switch tubes
1 Flat blade screwdriver
1 Cross point screwdriver
3 Open-end wrenches, 8-10, 12-14, 17-19
1 Set of hex wrenches
1 Owner's manual
1 Warranty card
Read and understand the entire contents of this manual before attempting set-up
or operation! Failure t o co mply may cause serious injury.
8
7.0 Assembly
The sander should be placed on a level, sturdy
floor, preferably concrete, with plenty of space
surrounding it for on- and off-loading of stock,
and general maintenance work.
Open the two lower side panels and use the
leveling screws inside the cabinet (Figure 1) to
level the sander. The machine can also be
secured to the floor with high quality lag screws
(not provided) through the four mounting holes
inside the cabinet.
Remove the protective coating from exposed
metal surfaces with a soft cloth moistened with
kerosene or a good commercial solvent. Do not
use acetone, gasoline or lacquer thinner, as
these have a low flash point and can be a fire
hazard, as well as damage the paint finish. Do
not get solvents on rubber or plastic areas of the
machine.
7.1 Air Supply Connection
Figure 1
The sander must be connected to an air supply
unit. The recommended working pressure is 75
to 80 PSI.
The air connection is on the Filter/Regulator unit
located at the back of the sander (Figure 2).
Attach the incoming air supply to the connector
with a flexible hose.
The working pressure can be adjusted with the
pressure regulator. Lift up on the adjustment
knob and rotate it clockwise to increase air
pressure, counterclockwise to decrease air
pressure. When the desired pressure is shown
on the pressure gauge, push down the
adjustment knob to lock the setting.
7.2 Dust Collection
Connect a dust collection system (not provided)
to the dust ports atop the sander cabinet with 5”
flexible hose and hose clamps. Make sure your
dust collector has sufficient capacity for this
machine.
Figure 2
Always turn on the dust collector prior to
operating the sander.
9
7.3 Installing/Replacing Sanding Belt
1. Machine should be disconnected from
power source.
2. Turn the air valve switch (A, Figure 3) to Off
position.
3. Remove the lock screw (B, Figure 3) by
turning it counterclockwise and lifting up.
4. Remove the spacer block (C, Figure 3).
5. Inspect the sanding belt for defects such as
chipped or torn edges. Do not use a belt if it
is damaged.
Make sure the direction of
the arrows on the inside of the sanding belt
matches the rotation of the machine. See
Figure 4.
6. Install the new belt by placing it first over the
upper roller, then over the free and contact
rollers, and slide the belt all the way onto
the rollers.
7. Center the belt while avoiding contact with
the limit switch fingers that are located on
each side of the belt.
Figure 3
8. Re-install the spacer block (C, Figure 3) and
lock screw (B, Figure 3) and tighten the lock
screw by turning clockwise.
9. Turn the air valve switch (A, Figure 3) to ON
to tension the sanding belt.
10. Make sure there is clearance between
sanding belt edges and the limit switch
fingers on either side. If there is not, make
the appropriate corrections (with the air
valve turned OFF).
NOTE: The sander will not start if a limit
switch is engaged.
11. Before doing any sanding, the sanding belt
should be tested for proper tracking and
oscillation. See the appropriate sections in
this manual.
8.0 Electrical
8.1 Grounding Instructions
Electrical connections must
be made by a qualified electrician in
compliance with all relevant codes. This
machine must be properly grounded while in
use to help protect the operator from
electrical sho ck and po ssib le fatal injury.
In the event of a malfunction or breakdown,
grounding provides a path of least resistance for
Figure 4
10
electric current to reduce the risk of electric
shock to the operator.
Improper connection of the equipmentgrounding conductor can result in risk of electric
shock. The conductor, with insulation having an
outer surface that is green with or without yellow
stripes, is the equipment-grounding conductor. If
repair or replacement of the electric cord or plug
is necessary, do not connect the equipmentgrounding conductor to a live terminal.
Check with a qualified electrician or service
personnel if the grounding instructions are not
completely understood, or if in doubt as to
whether the tool is properly grounded.
The sander should be connected to a dedicated
circuit with a minimum 100 Amp service. The
sander has been factory wired to run at 230 volt
operation. It can be converted to 460 volt if
desired. See the appropriate sections below.
8.2 230 Volt Operation
The sander may be fitted with a 230 volt plug, or
may be “hard-wired” directly to an electrical
control panel. If hard-wired to a panel, make
sure a disconnect is available for the
operator.
Refer to the diagram inside the sander’s
electrical box for clarification of electrical
connections. These diagrams are also shown in
sections 17.0 and 18.0 of this manual.
1. Make sure the machine’s plug is
disconnected from the power source. If it will
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. Always follow proper Lock
Out/Tag Out procedures when performing
any wiring on this machine.
2. Make sure the power source corresponds to
the specifications of the sander as recorded
on the sander’s motor plate.
3. Open the sander’s electrical box and
connect the three incoming power leads to
the terminals marked R,S,T. See Figure 5.
Connect the green ground wire to grounding
terminal E.
4. Connect the machine to power (or install the
fuses or reset the breaker at the power
source). The power light (see Figure 19)
should now be lit.
Figure 5
(Model WB-25 shown)
11
5. Press the Up S or Down T button on the
keypad (see page 18 for detailed keypad
instructions). Make sure the conveyor table
moves in the same direction as indicated on
the button.
6. If the conveyor table moves in the wrong
direction, turn off the machine and
disconnect from power. Switch any two of
the three incoming power leads at R,S,T.
7. Re-connect power to the sander.
8.3 460 Volt Conversion
To convert the sander to 460V:
1. Disconnect sander from power source.
2. In the electrical cabinet, switch the “R” wire
on the transformer from the 220V to the
440V terminal. See Figure 6. (Refer to the
wiring diagram on the inside cover of the
electrical box for clarification.)
3. Replace two 230V overload relays with two
460V overload relays (not included; see
parts list for stock numbers).
4. Change the wiring at the main motor, the
conveyor table motor, and the table
elevating motor, according to the wiring
diagrams inside their respective junction
boxes.
5. If using a plug, install a UL/CSA-listed plug
appropriate for 460V operation.
8.4 Extension cords
The use of an extension cord for this sander is
discouraged, because of the machine’s high
amperage draw. If an extension cord becomes
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.
9.0 Adjustments
9.1
Sanding Belt Tracking and
Oscillation
Figure 6
The sanding belt should oscillate left and right
without a tendency to slide off the rollers. If the
sanding belt runs outside of the normal track, it
will contact a limit switch and the machine will
stop automatically.
The oscillation settings have been made at the
factory, but should be checked by the operator.
NOTE: When a new sanding belt is installed,
there may be a slight length tolerance between
the right and left sides of the sanding belt which
12
may result in incorrect tracking. If this occurs,
the oscillation timing can be set to compensate.
1. Adjust oscillation while the machine is
running. Turn on the air valve switch and
press the sanding belt start button (see
Figure 19).
2. The upper roller will pivot left and right. The
duration of the sanding belt’s oscillation to
the right side and to the left should be equal.
For example, if the oscillation time to the
right is one second, then the oscillation time
to the left should also be one second.
3. If the oscillation time to the right side is one
second, but the oscillation time to the left
side is longer, then loosen the tracking
adjustment lever (rotate it counterclockwise)
and move it to the left until proper timing is
achieved. See Figure 7.
4. When finished, tighten the tracking
adjustment lever.
5. If the oscillation time to the left side is one
second, but the oscillation time to the right
side is longer, then loosen the tracking
adjustment lever and move it to the right
until proper timing is achieved. Tighten the
tracking adjustment lever.
9.2 Oscillation Air Flow
For correct sanding belt oscillation, there must
be adequate air flow through the holes of the
oscillation bracket (Figure 8). When the sanding
belt is operating, its edge will pass over the
holes in the oscillation bracket. The blocked air
flow will cause a sensor to activate the tracking
cylinder, which pivots the upper roller and shifts
the belt back out, causing it to leave the air flow.
This process will continually repeat itself.
Figure 7
Figure 8
If there is inadequate air flow, the sanding belt
will track too far and contact a limit switch.
Adjust the air flow using the air flow control knob
(Figure 9). Loosen the jam nut and rotate the
knob clockwise to decrease air flow,
counterclockwise to increase air flow. Tighten
the jam nut to lock the setting.
Frequently inspect the holes in the oscillation
bracket – make sure they are clean and clear of
obstructions.
9.3 Oscillation Speed
To adjust the speed of the oscillation, loosen the
jam nut on the speed control knob (Figure 9),
then turn knob clockwise to decrease oscillation
speed or counterclockwise to increase
oscillation speed. When finished, tighten jam
nut.
Figure 9
13
9.4 Platen Position
The sander has a removable platen with a
graphite strip and a felt pad to reduce friction
against the sanding belt. Positioning of the
platen depends upon the type of wood being
used.
The height of the platen is set at the factory, but
can be re-adjusted by rotating the platen
adjustment knob (Figure 10). Each mark on the
scale indicates a raising or lowering
measurement of 0.005mm. One complete
rotation of the scale moves the platen 0.2mm or
approximately 8/1000 of an inch.
Theoretically, optimum finish sanding results are
obtained when the bottom of the platen extends
slightly below the bottom of the conveyor rollers.
The main consideration in adjusting the platen is
to make sure that both ends are symmetrical
and level.
NOTE: The platen must be kept clean. After
sanding, if the workpiece has straight notches
across it, the graphite and felt pad have worn
out and should be replaced immediately.
Figure 10
9.5 Replacing Graphite and Felt Pad
To replace the graphite strip and felt pad,
proceed as follows:
1. Remove the lock screw (B, Figure 3) and
the spacer block (C, Figure 3).
2. Place the platen pull hook into the hole on
the end of the platen and pull out the lower
portion of the platen assembly, as shown in
Figure 10. NOTE: The platen is tightly fitted
and will require a firm pull with the pull hook.
3. Note carefully how the current graphite and
felt strip are mounted. Replace them with
the new ones.
4. Re-install the platen by aligning the end of it
with the dovetail track on the fixed portion of
the platen assembly, and push it all the way
in using the pull hook.
5. Replace the spacer block and lock screw.
9.6 V-Belt Tension and Replacement
For the first few days of operation a new belt
should be checked occasionally and adjusted for
tension as necessary until the belt is properly
“worn in.”
Figure 11
The v-belts on the main motor and table
elevating motor should be checked for proper
tension.
Tighten any of the v-belts as follows:
Figure 12
14
1. Disconnect sander from power source.
2. Loosen the lower hex nut (A, Figure 11/12)
on the motor base.
3. Tighten the top hex nut (B, Figure 11/12) to
lower the motor plate until proper tension is
achieved.
4. When the belt is properly tensioned, you
should be able to push in the belt
approximately 3/4” at a point midway
between the pulleys using moderate finger
pressure.
5. Re-tighten the bottom hex nut (B, Figure
11/12) against the bottom of the motor plate.
If installing a new v-belt, use the hex nuts to
raise the motor plate enough to remove the old
belt and mount the new one.
NOTE: When replacing v-belts on the main
motor, replace the entire set of three
simultaneously.
9.7 Conveyor Belt Tension
Check the tension of the conveyor belt on the
infeed and outfeed rollers – the conveyor belt
should be tight enough that you cannot shift it
with your hands. If the conveyor belt needs
tightening, proceed as follows.
1. Disconnect sander from power source.
2. Rotate the adjustment screws (the left one
is shown in Figure 13) as needed with a
19mm wrench. Rotate clockwise to increase
tension, counter-clockwise to decrease
tension. (NOTE: Removal of the emergency
stop cover is not necessary for tensioning.)
NOTE: Do not over-tighten the screws as this
will hasten wear of the conveyor belt.
9.8 Conveyor Belt Tracking
The conveyor belt should remain centered upon
the rollers during operation. If it approaches to
either the left or right side, adjustment is
necessary.
First check that the conveyor belt tension is
correct. If the tension needs adjustment, do this
first before you adjust the tracking (see
“Conveyor Belt Tension”). Then proceed as
follows.
Conveyor belt tracking should be adjusted while
the conveyor belt is running. Make adjustments
in increments and allow the conveyor belt time
to respond to each change.
Figure 13
Keep hands away from the
moving conveyo r bel t.
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1. Remove the four screws securing the
emergency stop cover and remove the
cover. See Figure 13. This will allow better
inspection of the belt’s movement on the
roller.
2. Turn on the conveyor belt.
3. Adjust tracking using the same adjustment
screws that were used for tensioning in
Figure 13.
4. If the conveyor belt is moving to the right
side, turn the right screw clockwise. This will
return the tracking toward the left.
5. If the conveyor belt is moving to the left
side, turn the left screw clockwise. This will
return the tracking toward the right.
6. A positioning wheel (Figure 14) has been
provided on the right and left sides of the
conveyor belt to limit the belt tracking. When
adjusting the tracking, the conveyor belt
should be moved until its edge just touches
the positioning wheels.
7. Allow the sander to run for several minutes
while observing the conveyor belt tracking
and readjust if necessary.
8. Turn off the conveyor belt and re-install
emergency stop cover.
Figure 14
9.9 Feed Rate
The feed rate is infinitely variable within the
provided range, in order to meet the sanding
requirements of a wide variety of materials.
Selecting a proper feed rate is largely a matter
of experience. In general, soft woods require a
higher feed rate, while hard woods require a
lower feed rate.
Change the feed rate only
while the conveyor belt is running. Failure to
comply may cause damage to the g earbo x.
Adjust the feed rate with the selector knob on
the worm gear reducer (Figure 15). Turn the
selector knob clockwise to decrease the
conveyor belt speed, counterclockwise to
increase it.
9.10 Pressure Bar Adjustment
The front and rear sets of pressure bars have
been factory adjusted. This setting should,
however, be checked before operating the
sander.
Figure 15
The pressure bars should be parallel to the
conveyor table with equal pressure on each end,
and are set slightly below the level of the
sanding belt.
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If the ends of the workpiece are sniped, the front
pressure bars are too low. The pressure should
be enough to firmly hold the workpiece against
the conveyor, but not so hard that the ends of
the workpiece spring up after clearing the bar.
Also, if the ends of the bars are not exerting
equal pressure, the workpiece will tend to move
sideways on the conveyor during sanding.
To raise or lower each set of pressure bars:
1. Disconnect sander from power source.
2. The sanding belt should be installed, and
the air valve turned ON.
3. Place a sanded panel with even thickness
on the conveyor table and under the
pressure bars. The panel should be long
enough to contact both front and back sets
of pressure bars.
4. Raise the table manually using the
handwheel (Figure 16) until the panel
contacts the pressure bars.
5. Make sure the pressure at the right and left
side of pressure bars is even.
6. If adjustment is needed, release the lock nut
(A, Figure 17) with a 14mm wrench.
7. Insert the adjusting tool (B, Figure 17) into a
hole in the adjusting knob. Rotate the
adjusting knob clockwise to raise that side
of the pressure bar, counterclockwise to
lower it.
8. When finished, re-tighten lock nut (A, Figure
17).
9.11 Table Parallelism
Parallelism of the conveyor table to the contact
roller has been factory-set and should not
require further adjustment. However, as the
machine receives extended use, this setting
should be checked.
Inspect parallelism by one of two methods:
1. Use a sanded board of equal thickness.
Pass the board several times through the
machine at a sanding depth of
approximately 1/64”, then measure the
thickness of the board at different points
along the edges with calipers. If excessive
variation occurs, the table needs adjusting.
OR, remove the sanding belt and place a
gauge of some kind at one side of the
conveyor table and below the contact roller.
Raise the table manually using the
handwheel until the gauge just touches the
contact roller. Repeat at the other side of
the table and compare the gauge readings.
Figure 16
Figure 17
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If the readings are different, the table needs
adjusting.
2. Disconnect sander from power source.
3. At the area of the table that needs
adjustment, loosen the two screws (A,
Figure 18) on the bracket of the elevation
screw, and rotate the bracket as needed.
(The elevation screw is protected by the
dust guard bellow.) Turn the elevating screw
clockwise to lower the table in that area,
counterclockwise to raise the table (see
Figure 18).
IMPORTANT: Turn both elevating screws at
one side of the table an equal amount, in
order to maintain front-to-back parallelism
with the rollers.
4. Tighten screws (A, Figure 18).
5. Re-connect sander to power, and make
further test runs. Make additional
adjustments as needed, with the machine
disconnect ed from power.
10.0 Operating Controls
Figure 18
Figure 19 shows the control panel functions.
The emergency stop button shuts down all
machine operations. The button remains
engaged after being pushed. To disengage,
rotate the ring until the emergency stop button
pops back out.
The emergency stop cover has a plate (shown
in Figure 16) which shuts down all machine
operations when it is pushed.
10.1 Amperage Meter
The amperage meter (Figure 19) continually
monitors the load upon the sander. To avoid
tripping of the circuit breaker and the overload
relays, reduce the load immediately when the
amperage meter indicates excessive amperage
pull.
10.2 LED Controller and Keypad
The controller is used for precise positioning of
the conveyor table based upon the workpiece
thickness and your desired sanding depth.
Figure 20 shows the key features of the unit.
Figure 19
T he LED control unit comes
pre-programmed from the factory. Do NOT
alter the specifications of your control unit
without authorization from WMH Tool Group.
Incorrect programming of the device could
cause uni t failure as w ell as risk o f injury to
people and damage to the sander.
Figure 20
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10.2.1 Calibr ation
To establish the distance between conveyor
table and sanding belt, proceed as follows:
1. Connect power and air to the sander, and
turn the air valve switch on to tighten the
sanding belt. NOTE: The controller will not
move the table if the air valve switch is off.
2. Press and hold the UP S button on the
keypad to raise the conveyor table until the
thicknesser knob (Figure 21) contacts the
limit switch. The table will automatically stop
while making slight contact with the sanding
belt.
3. Press “0” (zero) on the keypad (the display
will begin flashing and the input light will be
lit). Then press SET for 2 to 3 seconds. The
display will now read zero. This is the
distance between sanding belt and conveyor
table, upon which further movement of the
table can be based.
4. Input a number using the keypad (display
will begin flashing and the input light will be
illuminated).
5. While the display is still flashing, press the
START button on the keypad (run light will
now be illuminated). The conveyor table will
move to the desired distance from the
sanding belt.
10.2.2 Using the LED for Operations
The sander has a thicknesser which
automatically sets the table at the thickness of
your workpiece:
1. Place your workpiece upon the conveyor
table and move it below the thicknesser, as
shown in Figure 21. Keep the workpiece flat
upon the table. Press and hold the UP S
button on the keypad to raise the conveyor
table. When the workpiece contacts the limit
switch the conveyor table will stop. The table
is now positioned at the thickness of your
workpiece.
2. Remove the workpiece.
3. Press and release the UP S button, which
will raise the table for the first sanding pass.
NOTE: The arrow buttons are programmed
to move the table in .005” increments.
10.2.3 Inch/Metric Toggle
At any time you may switch between standard
and metric measurements by pressing and
holding SET for ten seconds.
Figure 21
4. Press the sanding belt START button and
the conveyor table START button on the
control panel, and feed the workpiece
through the machine.
5. Make further passes as needed, raising the
table each time using the UPS button.
11.0 Operation
Before operating the sander, make sure that:
1. The dust collection system is turned on.
2. Sanding belt tracking and oscillation are
working properly.
3. Conveyor belt tracking is correct.
4. All screws and handles are tightened
securely.
5. Working air pressure is correct. (Normal
working pressure is 75 to 80 PSI.) Do not
operate sander until normal pressure is
reached.
6. Thickness is correctly input into the LED
unit.
7. Feed rate is correctly set.
8. Workpiece is free of nails, knots and other
obstructions.
11.1 Braking System
The sander will not start or will halt operations if
any of the following occur:
• No air supply to the machine.
• No sanding belt installed.
• Improper belt tension.
• Sanding belt runs out of track.
• The emergency stop button on the control
panel is pressed.
• The emergency stop plate on the conveyor
table is pushed.
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If the sanding belt breaks, all movement will be
stopped, though the conveyor table can still be
raised or lowered.
Once the machine has stopped, the operator
should find where the braking system was
tripped, and make the necessary adjustments.
The machine can then be re-set and started.
12.0 Maintenance
Before doing any
maintenance on the sander, disconnect it
from the electrical supply by pulling out the
plug or switching off the main switch.
Failure to compl y may cause seri ou s injury.
The interior of the machine should be thoroughly
cleaned each day after using the sander.
Remove the sanding belt before cleaning and
re-install it when finished.
Keep the sanding belt clean using cleaning
sticks or pads (not provided).
Blow dust off the conveyor belt with compressed
air or use a dust collector vacuum attachment.
The bearings should be greased after every 150
work hours.
The water should be removed daily from inside
the filter cups. On the filter/regulator at the back
of the cabinet, press the drain cock (see Figure
2). On the filter inside the cabinet, unscrew the
cup to empty it.
The oil inside the gear reducer should be
replaced after the first 100 work hours and every
2500 work hours thereafter. Recommended oil is
#90 gear oil. Pour oil into the filler hole until the
level is above the dot on the sight glass. See
Figure 22.
Figure 22
13.0 Dust Port Layout
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14.0 Troubleshooting the Sander
Trouble Probable Cause Remedy
Sander will not start. No incoming power. Check that sander is connected to
power, fuses are not blown or circuit
breakers are not tripped.
Low voltage. Check voltage at power source.
Loose wiring. Inspect and remedy any loose
connections on sander.
Starting switch is defective. Replace switch.
Motor is defective. Replace motor.
Sanding belt clogs
too quickly.
Sanding belt will not
run, or slips on the
rollers.
Sanding belt keeps
triggering the limit
switches.
Grit of sanding belt is too fine. Choose a larger grit of sanding paper.
Too much material being sanded off. Reduce the amount of material being
removed.
Wood is too oily. Choose different stock.
Too much dirt or glue on the wood. Choose cleaner stock.
Wood is too moist. Allow wood to dry before sanding.
Air valve switch is Off. Turn on air valve.
Emergency stop button is engaged. Disengage the stop button.
Limit switches are activated. Position sanding belt so it is between
the limit switches.
Insufficient air pressure causing belt
to slip on rollers.
Dust or debris on conveyor rollers Clean conveyor rollers.
Tracking adjustment/oscillation is not
correct.
Air flow control is closed. Open air flow control (page 13).
Make sure air pressure regulator is
set at 75 to 80 PSI (page 9).
Set tracking correctly. See page 12
and 13.
Machine takes too
long to stop after
emergency switch is
activated.
Grinding noise when
brake is activated.
Too much rounding
occurs along edges
when solid wood is
sanded.
The front end of stock
is thinner than the
rear.
Sensors are blocked on the air
cylinder bracket.
Air pressure is too low. Set air pressure to 75 to 80 PSI.
Brake pads are worn. Replace brake pads.
Brake pads are worn. Replace brake pads (rotor may need
Too much material is being removed,
making the contact drum press too
tightly.
Rear pressure bar is too low in
relation to the contact drum.
Clean the sensor areas on the
cylinder bracket. See page 13.
turning also).
Reduce the amount of material being
removed.
Raise rear pressure bar (page 16-17).
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