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Troubleshooting: Operational Problems
Trouble Probable Cause Remedy
Ripples in sanded
surface.
(Non-uniformly
spaced ripples).
Uneven feed rate. Check for these conditions and refer
to previous Troubleshooting sections:
Conveyor belt slips on drive roller.
Board slips on conveyor belt.
Conveyor gear motor stalls.
Excessive v-belt tension.
Set screw loose on shaft coupler
between gear motor and conveyor.
Conveyor bushings worn – replace.
Conveyor bushings dry – lubricate.
Excessive feed rate. Reduce depth of cut and/or feed rate.
Excessive depth of cut. Reduce depth of cut and/or feed rate.
Ripples in sanded
surface.
(Uniformly spaced
ripples).
Sander vibration.
Check for these conditions:
Loose bolts, or loose bearing and
pulley set screws – re-tighten.
Dirty drum – clean inside.
Excessive v-belt tension – reduce
tension.
Worn v-belt – replace.
Warped drive pulley – replace.
Drum out of balance – contact your
dealer or WMH authorized service
center.
Tension rollers set too low. Re-set tension rollers; see page 21.
Stock not supported properly during
infeed or outfeed.
Support stock with roller stand, tables
or benches.
Sniping of wood
(gouging near end of
board).
Conveyor drive roller or driven roller
higher than conveyor belt surface.
Re-adjust roller(s).
Feed rate too slow. Increase feed rate.
Excessive depth of cut for grit used.
Reduce depth of cut or increase grit
coarseness.
Excess build-up on abrasive strips.
Reduce depth of cut; clean strips or
replace; angle stock when feeding.
Abrasive is too fine. Replace with abrasive of coarser grit.
Abrasive strips are overlapped.
Rewrap strip without overlap. See
pages 12 and 13.
Burning of wood.
Drum out of alignment. Re-align drum. See pages 17-19.