Sharp SH-920 Instruction Manual page 57

No. Defects
1-2 Small and uneven
flutter marks
appeared on the
workpiece
surface.
1-3 Obvious ray
pattern parallel
lines that can be
seen by naked
eyes.
1-4 Comma-shaped
lines appeared
when grinding is
getting a high
surface finish.
1-5 Burned marks
and grinding
brunt caused by
over-heating of
the workpiece.
Causes
16) Stock removal is too
great.
17) Grinding wheel gets too
hard, dull or clogged.
1) Traveling cranes or hoists
inside the building.
2) Traveling vehicles in the
building or streets.
1) Bearings of grinding
spindle are defected.
2) Too much play on
wheelhead guideways.
3) Wheel is badly dressed.
1) Coolant gets too dirty.
2) Grinding wheel chips off.
1) Grinding wheel gets too
hard or too thin.
2) Grinding wheel gets dull or
clogged.
3) Stock removal is too great.
P.57 OF 70
Remedy
Reduce infeed amount.
Reduce cross feed
movement.
Use softer or coarser wheel.
Increase table speed.
Reduce infeed amount.
Roughen the wheel.
Check the sharpness of the
diamond dresser.
Improve the foundation.
Change the location/position.
Improve the foundation .
Change the location/position.
Please see item No. A-1 for
more details.
Dressing the wheel again.
Clean coolant or use
automatic paper strip filter.
Clean the interior grits of the
wheel cover.
Choose proper wheel.
Use softer or coarser wheel.
Increase table speed.
Reduce peripheral speed of
the wheel.
Dressing the wheel to make it
rougher and sharper.
Reduce infeed amount.
Reduce cross feed