Sharp SH-920 Instruction Manual page 55

(K) TROUBLE SHOOTING
Grinding defects, Causes and Remedy
【I】
No. Defects
1-1 Chatter marks
appeared on the
grinding surface.
Causes
1) The foundation is not firm
enough for the machine.
2) The leveling screws (jack
bolts) in machine base are
loosened.
3) Work table does not run
smoothly.
4) Table is not fully supported. Re-scrap the contacted
5) Grinding wheel does not sit
firmly on the wheel flange.
6) Flange (with wheel) does
not fit firmly on the grinding
spindle taper nose.
7) Wheel and flange are not
well balanced.
8) Wheel is asymmetrical.
P.55 OF 70
Remedy
Please improve the
foundation.
Check the leveling first and
lock them tight.
Check slideways have
enough lubricant oil. And
cylinders are smoothly
running.
surfaces of table and bed
slideways.
Replace the intermediate
washer between wheel and
flange, make sure to tighten
them well.
Clean both taper contacted
surfaces, make sure they are
well contacted and fitted
firmly.
Make sure the water-based
fluid on the wheel is dried out
BEFORE re-balancing wheel
and flange.
If wheel and flange cannot be
balanced well, dress the
wheel on periphery and both
sides before rebalancing
again. If it still cannot reach
the balance, please replace a