HEIDENHAIN iTNC 530 (34049x-08) Cycle programming - Manual (Page 494)

494 Touch probe cycles: automatic kinematics measurement
18
.4
MEA
S
URE
KINEMA
TICS
(Cy
cle
451,
DIN/ISO:
G451;
Option)
Notes on log data
 Error outputs
In the Test mode (Q406=0) the TNC outputs the accuracy that can be
attained by optimization and/or the accuracies attained through
optimization (Modes 1 and 2).
If the angular position of a rotary axis was calculated, the measured
data is also shown in the log.
 Dispersion (standard deviation)
In the log, 'dispersion', a term from statistics, is used as a measure
of accuracy. Measured dispersion (measured standard deviation)
means that 68.3 % of the actually measured spatial errors are within
the specified range (+/–). Optimized dispersion (optimized
standard deviation) means that 68.3% of the spatial errors to be
expected after the correction of the kinematics are within the
specified range (+/–).
 Evaluation of measuring points
The valuation numbers are 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. The valuation of
any rotary axis should not fall below a value of 2. Values greater than
or equal to 4 are desirable If the valuation numbers are too small,
increase the measurement range of the rotary axis, or the number
of measuring points.
If the valuation numbers are too small, increase the
measurement range of the rotary axis, or the number of
measuring points. If these measures do not improve the
valuation number, this might be due to an incorrect
kinematics description. If necessary, inform your service
agency.