| PROBLEM |
PROBABLE CAUSES |
CORRECTION |
| Scratch on ground surface |
Rest plate is too hard |
Use softer rest plate |
Dust or scrap of grinding wheel
adhered on control plate. |
Add soluble cutting fluid into coolant. |
| Evenly spaced sprial marking |
Grinding wheel edge is touched. |
Dress grinding wheel a conical shape. |
| Poor adjustment for guide plate. |
Adjust guide plate to a proper pallelism condition. |
| Dressing speed is too fast |
Reducing dreeing speed.
Reduce feed amount. |
Diamond dresser is damaged or
worn out |
Change contact position of diamond dresser.
Replace diamond dresser. |
Diamond dredder retainer is
loosened. |
Fasten diamond dresser retainer. |
| ¡@ |
Poor dreeing |
Dressing from the edge of grinding wheel. Keep
at a constant dressing speed. |
Evenly or unevenly spaced
fine lines |
External vibration. |
Isolate vibration source |
| Deep with irregular marking |
Grinding wheel is loosened |
Insert shim in between flange and grinding wheel |
Burning marking Crack
marking |
¡@ |
Mount diamond dresser again.
Replace diamond dresser.
Use low bonding grinding wheel and reduce feed
amount.
Increase coolant flow. |
| Vibration |
Lock screws are loosened. |
Reset it. Have load distributed uniformly |
| Unbalanced grinding wheel. |
Make grinding wheel balancing properly by using
a balancing stand. |
| Self vibration |
Workpiece center is too high |
Reduce workpiece center |
| Work rest angle is too big |
Reduce angle |
| Work rest thickness is too thin. |
Increase thickness |
| Work rest mounting is not proper. |
Tighten screws |
| Work rest is bent |
Correct work rest |
| Grinding load is too heavy |
Reduce grinding load |
| Incorrect grinding wheel |
Consult grinding wheel manufacturer. |
| Poor circularity of grinding wheel |
Properly dressing the grinding wheel before and
after balancing. Lock screws unigormly. |
Grinding balancing stand ia
loosened. |
Tighten screws properly |
| Spindle is loosened. |
Properly adjust regulating wheel spindle. |
| Diamound retainer is loosened |
Tighten the retainer.
Replace diamond. |
| External vibration |
Isolate external vibration. |
| Inaccurate circularity |
Workpiece center is too low |
Increase workpiece center |
| Work rest angle is too small |
Increase angle |
Excessive hardness of grinding
wheel |
Increase feed speed |
| Grinding pressure is too high |
When a sharp diamond dresser is used,
adjust speed properly. |
| Regulating wheel is loosened. |
Tighten the regulating wheel spindle securely |
Insufficient coolant in grinding
hollow workpiece. |
Increase coolant to grinding position. |
| Improper dressing |
Dressing properly. |
Center part of workpiece is
too big |
Improper adjustment of guide plate |
Adjust parallelism of guide plate.
Reduce tilting of regulating wheel spindle frame.
Increase angle of dressing device for regulating
wheel. |
Center part of workpiece is
too small. |
Improper adjustment of guide plate |
Adjust parallelism of guide plate.
Reduce tilting of regulating wheel spindle frame.
Reduce angle of dressing device for regulating
wheel. |
| Inaccurate squarenedd |
Serious deformation of workpiece
before grinding |
¡@ |
Too heavy grinding load on first
grinding. |
¡@ |
| Insuffcient grinding amount. |
¡@ |
