Page 497 - NORTON cutting-off and grinding wheels - industrial

TECHNICALINFORMATION
497
TECHNICAL INFORMATION
TROUBLESHOOTING
USE RIGID WORK SUPPORT
• All workpieces should be supported firmly during the grinding process. Any amount of vibration will cause
wheel wear & produce chatter or wave marks on the ground surface
• On work ground between centres, centreholds should be properly prepared
• Minimise work overhang
• If the ground work is supported by a work finger, ensure the finger is strong enough to provide
vibration-free support
AVOID EXCESSIVE FEEDS
• Excessive feeds will result in premature wheel wear. Excessive feed rates are characterised by:
– A hard grinding sound
– Chatter
– Burn
– High wheel wear rate
– Vibration
DRY GRINDING
BURNING ŸEXCESSIVE HEAT£
Cause Wheel loaded or glazed
Solution Dress wheel with a dressing stick
Cause Excessive feed rate
Solution Reduce infeed of wheel or workpiece
Cause Wheel too durable
Solution Use freer cutting specification or slow down wheel speed
Cause Wheel speed too high
Solution Slower wheel speed
POOR FINISH
Cause Grit size too coarse
Solution Select a finer grit size
Cause Excessive feed rate
Solution Reduce infeed of wheel or workpiece
CHATTER
Cause Wheel out of truth
Solution True wheel; ensure it is not slipping on mount
Cause Wheel too hard
Solution Check specification