Acer Supra 818PD Operation Manual page 45

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5.7.3 SURFACE GRINDING PROBLEM ANALYSIS
Surface grinding defects and causes are shown on below table:
CAUSES
‧Machine operation
Coolant dirted
Insufficient coolant amount
Incorrect coolant
Chuck is dirted or has burrs
Insufficient holding force
Poor holding
Workpiece slip on chuck
Diamond is dulled
Grinding wheel is dressed too
fine
Too long grinding travel
Guard is loosened
‧Grinding wheel
Grains are too fine
Grinding wheel structure is
too tight
Bonding is too hard
Bonding is too soft
‧Machine setup
Incorrect chuck position
Diamond is loosened or
broken
No magnetic force on chuck
vibration
‧Workpiece condition
Heat treatment stress
Too thin
Burning or Workpiece Chattering
grid pattern poor finish
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Surface grinding defects and causes
DEFECT CONDITIONS
Grinding
Scratch wheel
mark
smooth
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5-17
Grinding
Workpiece Workpiece
wheel
not parallel not parallel
clogged
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818~2040 PD
Workpiece
slip on chuck
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