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Reasons for Belt Slippage
- The belt tension is too low.
- The contact roll is worn excessively.
- Shock load on the belt due to a big variation in workpiece thickness.
- Dirt or dust between belt and contact roll.
- A plain steel contact roll not providing enough traction for the belt. Try a serrated roll or knurl the surface of the roll.
Reasons for Split Belts
- The belt is too flexible of application.
- Burr on the contact roll or platen.
- Contamination on the workpiece (nail, staple, etc.)
- Excessive depth of cut or sanding pressure.
- Contact roll and idler roll are not parallel.
- The abrasive material is not heavy enough for application.
- Variation in workpiece thickness.
- Sanding in only one area of the belt. Stagger the workpieces across the width of a wide belt.
- Worn contact roll.