HEIDENHAIN iTNC 530 (340 49x-05) Cycle programming - Manual (Page 464)

464 Touch Probe Cycles: Automatic Kinematics Measurement
1
8
.4 MEA
S
URE KINEMA
TICS (Cy
c
le
451, DIN/ISO: G451; option)
Log function
After running Cycle 451, the TNC creates a measuring log
(TCHPR451.TXT) containing the following information:
„ Creation date and time of the log
„ Path of the NC program from which the cycle was run
„ Mode used (0=Check/1=Optimize)
„ Active kinematic number
„ Entered calibrating ball radius
„ For each measured rotary axis:
„ Start angle
„ End angle
„ Angle of incidence
„ Number of measuring points
„ Measured dispersion (measured standard deviation)
„ Optimized dispersion (optimized standard deviation)
„ Ascertained backlash
„ Averaged positioning error
„ Measuring circle radius
„ Compensation values in all axes
„ Measurement uncertainty of rotary axes
Notes on log data
Valuation number
The valuation number is a measure of the quality of the measuring
positions with respect to the changeable transformations of the
kinematics model. The higher the valuation number, the greater the
benefit from optimization by the TNC.
Because the TNC always needs two transformations for measuring
the position of a rotary axis, two valuation numbers per rotary axis are
determined. If a complete valuation is missing, the position of a rotary
axis in the kinematics model is not completely defined. The higher the
valuation number, the greater the benefit from changing the
deviations of the measuring points by adjusting the transformation.
The valuation numbers are independent of the measured errors. They
are defined by the kinematics model, the position and the number of
measuring points per rotary axis.
The valuation of any rotary axis should not fall below a value of 2.
Values greater or equal to 4 are desirable.
If the valuation numbers are too small, increase the
measurement range of the rotary axis, or also the number
of measuring points. If these measures do not improve the
valuation number it may be because of an incorrect
kinematic description. If necessary, inform your service
agency.