Page 491 - NORTON cutting-off and grinding wheels - industrial

TECHNICALINFORMATION
491
TECHNICAL INFORMATION
TROUBLESHOOTING
SOLVING SURFACE FINISH PROBLEMS
Many problems associated with grinding relate to surface finish defects. The following chart describes
some common surface finish problems, shows the probable causes and suggests remedies to cure
the problem.
REGULAR SPACED CHATTER MARKS
Immediately after dressing
Cause Machine vibration
Solution Check for wear in machine bearings
REGULAR SPACED CHATTER MARKS
After a period of time
Cause Wheel too hard
Solution Use softer grade of wheel
CHEQUERED PATTERN
Cause Wheel out of balance
Solution Balance wheel
CHATTER MARKS
Cause Wheel out of truth
Solution Re-dress wheel
IRREGULAR CHATTER MARKS
Cause Wheel mounting insecure
Solution Tighten wheel mounting
Cause Workpiece centres loose
Solution Adjust centres
SPIRAL MARKS
Cause Dressing techniques
Solution Check diamond is sharp & secure
Cause Dressing techniques
Solution Check dress is parallel
FINISH TOO COARSE
Cause Grit size too coarse
Solution Use fine, slow traverse dress
Cause Wheel too soft
Solution Decrease workspeed. Use harder grade wheel
Cause Metal pick-up on wheel
Solution Dress more frequently. Use more open, softer grade wheel