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Troubleshooting of grinding

Resin/metal/vitrified bond wheels

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Symptom	Possible Cause	Corrective Action
Poor surface roughness	Coarse abrasive grains	Reduce the grain size.
	Wheel run-out	Check run-out and conduct truing/dressing.
	Machine vibration	Check wheel run-out and balance.
	Insufficient dressing amount	Increase the dressing amount and conduct dressing regularly.
	Supply amount and deterioration of grinding fluid	Increase the supply amount. Check grinding fluid for deterioration and replace fluid or filter.
Grinding burn	Insufficient dressing amount	Increase the dressing amount and conduct dressing regularly.
	Inadequate grinding conditions	Reduce the wheel depth of cut and infeed speed. Reduce the wheel peripheral speed.
	Insufficient supply of grinding fluid	Increase the supply amount or the supply pressure. Check the supply point.
	Inadequate wheel specifications	Change the wheel specifications. ・Make the grain size larger. ・Lower the concentration.
	Inadequate wheel specifications	Check the wheel surface. If dulled largely, soften the bond.
Feed mark	Wheel run-out	Check run-out and conduct truing/dressing.
	Machine vibration	Check wheel run-out and balance.
	Inadequate wheel specifications	Check the wheel surface and change the grain size/bond. ・If the surface is dulled largely　→　Make the grain size larger. ・If the surface is shedded largely　→　Make the bond harder.

Electroplated wheel

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Symptom	Possible Cause	Corrective Action
Poor surface roughness	Coarse abrasive grains	Reduce the grain size.
	Wheel run-out	Re-mount the wheel and adjust its run-out.
	Machine vibration	Re-mount the wheel and adjust its run-out.
	Inadequate grinding conditions	Increase the wheel peripheral speed. Extend the spark-out time.
	Supply amount and deterioration of grinding fluid	Increase the supply amount. Check grinding fluid for deterioration and replace fluid or filter.
Grinding burn	Inadequate grinding conditions	Reduce the wheel depth of cut and infeed speed.
	Inadequate wheel specifications	Make the grain size larger.
	Insufficient supply of grinding fluid	Increase the supply amount or the supply pressure. Check the supply point.
Feed mark	Wheel run-out	Re-mount the wheel and adjust its run-out.
Feed mark	Machine vibration	Check wheel run-out and balance.

Main abrasive surface conditions when trouble occurred

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Wheel Surface Condition		Schematic of Wheel Surface Conditions
Loading	Surface loaded with chips to cover projection of abrasive grains or chips adhering to the cutting edge.
Shedding	Abrasive grains dropped out of bond due to fracture or falling.
Dulling	Sharp cutting edge worn and flattened to become dull.

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