6.3
Fault-finding
Symptom Cause Action
Poor probe repeatability and /
or accuracy.
Debris on part or stylus.
Poor tool change repeatability.
Loose probe mounting on
shank or loose stylus.
Excessive machine vibration.
Calibration out of date and/or
incorrect offsets.
Calibration and probing speeds
not the same.
Calibration feature has moved.
Measurement occurs as stylus
leaves surface.
Measurement occurs within
the machine’s acceleration and
deceleration zone.
Probing speed too high or too
slow.
Temperature variation causes
machine and workpiece
movement.
Machine tool faulty.
Clean part and stylus.
Re-datum probe after each tool
change.
Check and tighten as
appropriate.
Enable enhanced trigger lter.
Eliminate vibrations.
Review probing software.
Review probing software.
Correct position.
Review probing software.
Review probing software and
probe lter settings.
Perform simple repeatability
trials at various speeds.
Minimise temperature changes.
Perform health checks on
machine tool.
Probe permanently triggered. Probe orientation has changed -
i.e. from horizontal to vertical.
New stylus has been tted.
Horizontal probe has rotated
about its own axis.
Select probe Auto-reset
function.
Ensure stylus is seated during
switch on.
Turn probe off, then on again.
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