-28-
Model W1839 & W1840 (For Machines Mfd. Since 3/16)
SE
RV
IC
E
Operation
PROBLEM
POSSIBLE.CAUSE
CORRECTIVE.ACTION
Machine slows
when operat-
ing.
1. Operator applying too much pressure too
quickly.
2. RPM too low.
1. Slow down rate of movement of workpiece into
wheel; use less pressure.
2. Adjust RPM.
Wavy condition
on surface of
workpiece.
1. Machine vibrating.
2. Workpiece not being held firmly.
3. Wheel face uneven.
4. Wheel is too hard.
1. Ensure machine is securely mounted to a solid sur-
face (
Page 15
).
2. Use a holding device to firmly retain workpiece.
3. Dress grinding wheel (
Page 23
).
4. Use softer wheel or reduce feed rate.
Lines on surface
of workpiece.
1. Impurity on wheel surface.
2. Workpiece not being held tightly.
1. Dress grinding wheel (
Page 23
).
2. Use a holding device to firmly retain workpiece.
Burning spots
or cracks in the
workpiece.
1. Improper type of grinding wheel.
2. Improper feed rate.
3. Workpiece requires quenching.
1. Try a wheel with softer style or a coarser grit.
2. Slow down rate of movement of workpiece into
wheel.
3. Quench workpiece in water to cool.
Wheel dulls
quickly, grit
falls off.
1. Operator applying too much pressure too
quickly.
2. Wheel is too soft.
3. Wheel diameter too small.
4. Bad wheel dress.
5. Defective wheel bonding.
1. Slow down rate of movement of workpiece into
wheel; use less pressure.
2. Wheel too soft for material being ground, select
harder bond.
3. Replace grinding wheel (
Page 24
).
4. Re-dress grinding wheel (
Page 23
).
5. Replace grinding wheel. Consult manufacturer of
grinding wheel.
