Troubleshooting: Operational Problems - Jet Drum Sander Operating Instructions And Parts Manual

Troubleshooting: Operational Problems

Trouble
Ripples in sanded
surface.
(Non-uniformly
spaced ripples).
Ripples in sanded
surface.
(Uniformly spaced
ripples).
Sniping of wood
(gouging near end of
board).
Burning of wood.
Gouging of wood.
Probable Cause
Uneven feed rate.
Excessive feed rate.
Excessive depth of cut.
Sander vibration.
Tension rollers set too low.
Stock not supported properly during
infeed or outfeed.
Conveyor drive roller or driven roller
higher than conveyor belt surface.
Feed rate too slow.
Excessive depth of cut for grit used.
Excess build-up on abrasive strips.
Abrasive is too fine.
Abrasive strips are overlapped.
Drum out of alignment.
Conveyor belt is loose.
Excessive depth of cut.
Wood slipping on conveyor due to
lack of contact
Abrasive is too fine.
Remedy
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.
Set screw loose on shaft coupler
between gear motor and conveyor.
Conveyor bushings dry – lubricate.
Conveyor bushings worn – replace.
Reduce depth of cut and/or feed rate.
Reduce depth of cut and/or feed rate.
Loose bolts, or loose bearing and
pulley set screws – re-tighten.
Dirty drum – clean inside.
Drum out of balance – contact your
dealer or WMH authorized service
center.
Re-set tension rollers.
Support stock with roller stand, tables
or benches.
Re-adjust roller(s).
Increase feed rate.
Reduce depth of cut or increase grit
coarseness.
Reduce depth of cut; clean strips or
replace; angle stock when feeding.
Replace with abrasive of coarser grit.
Rewrap strip without overlap. See
pages 11 and 12.
Re-align drum. See pages 16 and 17.
Adjust conveyor belt tension. See
page 15.
Reduce depth of cut.
Use alternate feeding procedure.
Replace with coarser grit.
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