Reasons for Belt Slippage

1. Belt tension is too low.
2. Contact roll is worn excessively.
3. Shock load on belt due to big variation in workpice thickness.
4. Dirt or dust between belt and contact roll.
5. Plain steel contact roll not providing enough traction for belt. Try serrated roll or knurl surface of roll.

Reasons for Split Belts

1. Belt is too flexible of application.
2. Burr on the contact roll or platen.
3. Contamination on workpiece (nail, staple, etc.)
4. Excessive depth of cut or sanding pressure.
5. Contact roll and idler roll not parallel.
6. Abrasive material is not heavy enough for application.
7. Variation in workpiece thickness.
8. Sanding in only one area of the belt. Stagger workpieces across the width of a wide belt.
9. Worn contact roll.