Powermatic WB-37 Operating Instructions And Parts Manual page 22

Trouble
The front end of stock
is thinner than the
rear.
The rear end of stock
is thinner than the
front.
Uneven thickness
between the left and
right sides of the
workpiece.
Uneven thickness
between the front and
rear ends of the
workpiece.
Workpiece slips on
conveyor belt.
Straight strip of
notches or grooves in
the workpiece.
"Snake" marks on
workpiece.
Straight parallel
running stripes over
entire width of
workpiece.
Glossy spots on the
wood.
Probable Cause
Rear pressure bar is too low in
relation to the contact drum.
Front pressure bar is too low in
relation to the contact drum.
Table not positioned correctly in
relation to contact drum.
Front pressure bar not in correct
position in relation to contact drum.
Graphite strip and felt pad are worn
out.
Conveyor belt is worn.
Feed rate is too high.
Too much stock removal.
Grit of sanding belt too fine.
Unequal position of pressure bars.
Table not parallel front to back.
Not enough pressure between
pressure bar and workpiece.
Too much dust or debris on conveyor
belt.
Rear pressure bar too low, halts the
workpiece.
Dirty pressure bar.
Contact drum is scratched.
Graphite strip and felt pad are worn.
Local damage to the sanding belt.
Joint of the sanding belt is too thick or
is open.
Sanding belt is too old.
Rear pressure bar is too low.
Remedy
Raise rear pressure bar (page 16-17).
Raise front pressure bar (page 16).
Adjust table until it is parallel left to
right (pages 17-18).
Adjust front pressure bar to parallel.
See page 16.
Replace graphite strip and felt pad.
See page 14.
Replace conveyor belt (contact WMH
Technical Service).
Reduce feed rate. See page 16.
Reduce amount of material being
removed.
Use larger grit sanding belt.
Adjust pressure bars to produce equal
pressure on stock.
Adjust table until it is parallel front to
back (pages 17-18).
Increase pressure between pressure
bar and workpiece.
Clean conveyor belt with compressed
air.
Raise rear pressure bar until proper
contact is achieved.
Clean pressure bar.
Replace contact drum.
Replace graphite and pad.
Replace sanding belt.
Repair joint or replace sanding belt.
Replace with new sanding belt.
Raise rear pressure bar.
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