Grizzly G0644 owner manual Sanding Operation

Motor & Electrical (continued)

Symptom						Possible Cause		Possible Solution
Motor	stalls		or	is	1.		Sanding depth too aggressive.	1. Reduce sanding depth or install coarser sandpaper.
overloaded.					2.		Workpiece material is not suitable for this	2. Only sand wood products; make sure moisture con-
							machine.		tent is below 20% and there are no foreign materials
									in the workpiece.
						3. Conveyor speed too fast for task.		3. Decrease conveyor speed (feed rate).
					4.		Dust collection ducting is poor.	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. Air pressure brake solenoid is at fault.		5.	Test/replace.
						6. Run capacitor is at fault.		6.	Test/replace.
						7. Conveyor speed dial is at fault.		7. Test and replace if faulty.
						8. Motor connection is wired incorrectly.		8. Correct motor wiring connections.
						9. Plug/receptacle is at fault.		9. Test for good contacts; correct the wiring.
						10. Motor bearings are at fault.		10. Test by rotating shaft; rotational grinding/loose shaft
									requires bearing replacement.
						11. Machine is undersized for the task.		11. Use new sandpaper with appropriate grit; reduce the
									feed rate/depth of sanding.
						12. Motor has overheated.		12. Clean off motor, let cool, and reduce workload.
						13. Contactor not getting energized or has poor		13. Test for power on all legs and contactor operation.
							contacts.		Replace if faulty.
						14. Motor is at fault.		14. Test/repair/replace.
						15. Centrifugal switch is at fault.		15. Adjust/replace centrifugal switch if available.
Sanding Operation
SYMPTOM						POSSIBLE CAUSE		CORRECTIVE ACTION
Grit rubs off the belt						1.	Sanding belt has been stored in an incor-	1.	Store sanding belt away from extremely dry or hot
easily.							rect environment.		temperatures.
						2.	Sanding belt has been folded or smashed.	2. Store sanding belt flat, not folded or bent.
Sanding		surfaces				1.	Sanding depth too aggressive.	1.	Reduce sanding depth or install coarser sandpaper.
clog quickly or burn.						2.	Sanding softwood.	2.	Use different stock. Or, accept the characteristics
									of the stock and plan on cleaning/replacing belts
									frequently.
Burn	marks			on		1.	Using too fine of sanding grit.	1.	Use a coarser grit sanding belt.
workpiece.						2.	Sanding depth too aggressive.	2.	Reduce sanding depth or install coarser sandpaper.
						3.	Work held still for too long.	3.	Do not keep workpiece in one place for too long.
Glazed sanding sur-						1.	Sanding wet stock.	1.	Dry stock properly before sanding.
faces.						2.	Sanding stock with high residue.	2.	Use different stock. Or, accept the characteristics
									of the stock and plan on cleaning/replacing sanding
									belts frequently.
Workpiece		slips		on		1.	Dirty conveyor belt.	1.	Clean conveyor belt.
conveyor belt.						2.	Conveyor belt is worn.	2.	Replace conveyor belt.
Uneven		thickness				1.	Sanding drum not parallel to conveyor.	1.	Adjust the conveyor to sanding drum parallelism
from left to right of						2.	Conveyor belt is worn.		(Page 32).
board.								2.	Replace conveyor belt.
Machine		is	loud,			1.	Excessive depth of cut.	1.	Decrease depth of cut.
overheats		or	bogs			2.	Dull sanding belt.	2.	Replace sanding belt.
down in the cut.
-30-									G0644 15" Open-End Wide Belt Sander