Powermatic WB-25 - Manual (Page 22)

22
Trouble Probable Cause Remedy
The front end of stock
is thinner than the
rear. Rear pressure bar is too low in
relation to the contact drum. Raise rear pressure bar (page 16-17).
The rear end of stock
is thinner than the
front. Front pressure bar is too low in
relation to the contact drum. Raise front pressure bar (page 16).
Table not positioned correctly in
relation to contact drum. Adjust table until it is parallel left to
right (pages 17-18).
Front pressure bar not in correct
position in relation to contact drum. Adjust front pressure bar to parallel.
See page 16.
Graphite strip and felt pad are worn
out. Replace graphite strip and felt pad.
See page 14.
Uneven thickness
between the left and
right sides of the
workpiece.
Conveyor belt is worn. Replace conveyor belt (contact WMH
Technical Service).
Feed rate is too high. Reduce feed rate. See page 16.
Too much stock removal. Reduce amount of material being
removed.
Grit of sanding belt too fine. Use larger grit sanding belt.
Unequal position of pressure bars. Adjust pressure bars to produce equal
pressure on stock.
Uneven thickness
between the front and
rear ends of the
workpiece.
Table not parallel front to back. Adjust table until it is parallel front to
back (pages 17-18).
Not enough pressure between
pressure bar and workpiece. Increase pressure between pressure
bar and workpiece.
Too much dust or debris on conveyor
belt. Clean conveyor belt with compressed
air.
Workpiece slips on
conveyor belt.
Rear pressure bar too low, halts the
workpiece. Raise rear pressure bar until proper
contact is achieved.
Dirty pressure bar. Clean pressure bar.
Contact drum is scratched. Replace contact drum.
Straight strip of
notches or grooves in
the workpiece.
Graphite strip and felt pad are worn. Replace graphite and pad.
“Snake” marks on
workpiece. Local damage to the sanding belt. Replace sanding belt.
Straight parallel
running stripes over
entire width of
workpiece. Joint of the sanding belt is too thick or
is open. Repair joint or replace sanding belt.
Sanding belt is too old. Replace with new sanding belt. Glossy spots on the
wood.
Rear pressure bar is too low. Raise rear pressure bar.