Sanding Operation - Grizzly G0644 Owner's Manual

Motor & Electrical (continued)
Symptom Possible Cause
Motor stalls or is 1. Sanding depth too aggressive.
overloaded.
2. Workpiece material is not suitable for this
machine.
3. Conveyor speed too fast for task.
4. Dust collection ducting is poor.
5. Air pressure brake solenoid is at fault.
6. Run capacitor is at fault.
7. Conveyor speed dial is at fault.
8. Motor connection is wired incorrectly.
9. Plug/receptacle is at fault.
10. Motor bearings are at fault.
11. Machine is undersized for the task.
12. Motor has overheated.
13. Contactor not getting energized or has poor
contacts.
14. Motor is at fault.
15. Centrifugal switch is at fault.

Sanding Operation

SYMPTOM POSSIBLE CAUSE
Grit rubs off the belt 1. Sanding belt has been stored in an incor-
easily.
rect environment.
2. Sanding belt has been folded or smashed.
Sanding surfaces 1. Sanding depth too aggressive.
clog quickly or burn.
2. Sanding softwood.
Burn marks on 1. Using too fine of sanding grit.
workpiece.
2. Sanding depth too aggressive.
3. Work held still for too long.
Glazed sanding sur- 1. Sanding wet stock.
faces.
2. Sanding stock with high residue.
Workpiece slips on 1. Dirty conveyor belt.
conveyor belt. 2. Conveyor belt is worn.
Uneven thickness 1. Sanding drum not parallel to conveyor.
from left to right of
2. Conveyor belt is worn.
board.
Machine is loud, 1. Excessive depth of cut.
overheats or bogs
2. Dull sanding belt.
down in the cut.
-30-
Possible Solution
1. Reduce sanding depth or install coarser sandpaper.
2. Only sand wood products; make sure moisture con-
tent is below 20% and there are no foreign materials
in the workpiece.
3. Decrease conveyor speed (feed rate).
4. Seal all leaks, size ducts correctly, eliminate bends,
and refer to Dust Collection Basics Handbook (ISBN
0-9635821-2-7) for further recommendations.
5. Test/replace.
6. Test/replace.
7. Test and replace if faulty.
8. Correct motor wiring connections.
9. Test for good contacts; correct the wiring.
10. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
11. Use new sandpaper with appropriate grit; reduce the
feed rate/depth of sanding.
12. Clean off motor, let cool, and reduce workload.
13. Test for power on all legs and contactor operation.
Replace if faulty.
14. Test/repair/replace.
15. Adjust/replace centrifugal switch if available.
CORRECTIVE ACTION
1. Store sanding belt away from extremely dry or hot
temperatures.
2. Store sanding belt flat, not folded or bent.
1. Reduce sanding depth or install coarser sandpaper.
2. Use different stock. Or, accept the characteristics
of the stock and plan on cleaning/replacing belts
frequently.
1. Use a coarser grit sanding belt.
2. Reduce sanding depth or install coarser sandpaper.
3. Do not keep workpiece in one place for too long.
1. Dry stock properly before sanding.
2. Use different stock. Or, accept the characteristics
of the stock and plan on cleaning/replacing sanding
belts frequently.
1. Clean conveyor belt.
2. Replace conveyor belt.
1. Adjust the conveyor to sanding drum parallelism
(Page 32).
2. Replace conveyor belt.
1. Decrease depth of cut.
2. Replace sanding belt.
G0644 15" Open-End Wide Belt Sander