POOR SYSTEM REPEATABILITY
Possible Cause Rectification
Mounting screws not fully tightened Tighten screws to specified torque.
Re-datum probe.
Loose arm Verify tightness of arm on hub
Re-datum probe.
Loose probe Verify tightness of probe in mounting
Re-datum probe
Loose stylus Tighten stylus
Re-datum probe
Swarf on tool tip Remove swarf
Calibration and updating of offsets is
not occurring
Review software
Calibration and probing speeds are
not the same
Review software
Probing is being performed within the
machine acceleration/deceleration
zones
Review software
Probing feedrate is too high for
machine controller
Perform repeatability trials at various
speeds (see section 11.4 of
Installation and User’s Guide)
Temperature variation is causing
excessive movement in the machine
and the TSA
Minimise machine and TSA
temperature changes.
Machines has poor repeatability due
to loose encoders, backlash, tight
slideways and/or accident damage
Perform health check on machine tool
e.g. use Renishaw’s QC10 Ballbar
system
Excess machine vibration Eliminate vibration
Utilise Vlf power input in place of VI
Vlf is being used with inconsistent
probing speed
Change to VI and compare results
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