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Operation (Cont.)
Symptom
Possible Cause
Uneven
1. Drum height lock knob not tight and sanding
workpiece
drum deflects up.
thickness from
2. Sanding drum not parallel to table.
side to side.
3. Gibs too loose.
4. Conveyor belt worn.
Drum height
1. Drum height lock knob too tight.
handwheel hard
2. Leadscrew and nut clogged with sawdust.
to rotate.
3. Gibs too tight.
Workpiece pulls
1. Sanding drum not parallel with table.
to one side
during sanding
operations.
Ripples or lines
1. Uneven feed rate.
in workpiece.
2. Conveyor belt flexing or vibrating.
3. Sanding drum deflecting from workpiece.
Snipe marks in
1. Pressure rollers not properly adjusted.
workpiece.
2. Workpiece too long to be supported without
additional help.
3. Incorrect sandpaper grit.
Poor dust
1. Dust collection lines incorrectly sized for this
collection.
machine.
2. Dust collector underpowered or too far away
from machine.
Model G0920 (Mfd. Since 10/20)
Possible Solution
1. Fully tighten lock knob after setting drum height.
2. Align sanding drum to table (Page 41).
3. Adjust gibs (Page 41).
4. Replace conveyor belt (Page 39).
1. Loosen drum height lock knob.
2. Clean and lubricate leadscrew and nut (Page 34).
3. Adjust gibs (Page 41).
1. Adjust sanding drum parallel to table (Page 41).
1. Maintain even feed rate through entire sanding
operation.
2. Reduce sanding depth (Page 25)/reduce feed rate
(Page 27). Tighten loose fasteners.
3. Make sure drum height lock knob is tight.
1. Properly adjust pressure roller height (Page 44).
2. Use an assistant or roller stands/tables on infeed and
outfeed ends of conveyor to keep workpiece from
bending.
3. Use correct sandpaper grit for operation (Page 29).
1. Use at least an 8" main line with two 6" branch lines
that each Y into 4" at machine.
2. Upgrade dust collector or decrease distance from dust
collector to machine.
-37-
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