HEIDENHAIN iTNC 530 (340 49x-04) Touch Probe Cycles - Manual (Page 164)

164 4 Touch Probe Cycles for Automatic Kinematic Measurement
4.1 Kinematic Measur
ement with TS
T
ouc
h Pr
obes (Option KinematicsOpt)
Machines with Hirth-coupled axes
The positions are calculated from the start angle, end angle and
number of measurements for the respective axis.
Example calculation of measuring positions for an A axis:
Start angle Q411 = -30
End angle Q412 = +90
Number of measuring points Q414 = 4
Calculated angular step = ( Q412 - Q411 ) / ( Q414 -1 )
Calculated angular step = = ( 90 - -30 ) / ( 4 - 1 ) = 120 / 3 = 40
Measuring position 1 = Q411 + 0 * angular step = -30°
Measuring position 2 = Q411 + 1 * angular step = +10°
Measuring position 3 = Q411 + 1 * angular step = +50°
Measuring position 4 = Q411 + 1 * angular step = +90°
In order to be positioned, the axis must move out of the
Hirth coupling. So remember to leave a large enough
safety clearance to prevent any risk of collision between
the touch probe and calibration ball. Also ensure that there
is enough space to reach the safety clearance (software
limit switch).
Define a retraction height Q408 greater than 0 if software
option 9 (M128, FUNCTION TCPM) is not available.
When selecting the start and end angle, make sure that
each angular step fits in the Hirth grid. With Hirth axes, the
TNC checks at the beginning of the cycle whether the
calculated angle step matches the Hirth grid. If it doesn't,
the TNC shows an error message and terminates the
cycle.