HEIDENHAIN TNC 640 (34059x-01) Cycle programming - Manual (Page 516)

516 Touch Probe Cycles: Automatic Kinematics Measurement
1
9
.4 MEA
S
URE KINEMA
TICS (Cy
c
le
451, DIN/ISO: G451; Option)
Machines with Hirth-coupled axes
The measuring positions are calculated from the start angle, end angle
and number of measurements for the respective axis and from the
Hirth grid.
Example calculation of measuring positions for an A axis:
Start angle Q411 = –30
End angle Q412 = +90
Number of measuring points Q414 = 4
Hirth grid = 3°
Calculated stepping angle = ( Q412 – Q411 ) / ( Q414 – 1 )
Calculated stepping angle = = ( 90 – –30 ) / ( 4 – 1 ) = 120 / 3 = 40
Measuring position 1 = Q411 + 0 * stepping angle = –30° --> –30°
Measuring position 2 = Q411 + 1 * stepping angle = +10° --> 9°
Measuring position 3 = Q411 + 2 * stepping angle = +50° --> 51°
Measuring position 4 = Q411 + 3 * stepping angle = +90° --> 90°
Danger of collision!
In order to be positioned, the axis must move out of the
Hirth grid. So remember to leave a large enough safety
clearance to prevent any risk of collision between the
touch probe and calibration sphere. 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 2 (M128, FUNCTION TCPM) is not available.
If necessary, the TNC rounds the calculated measuring
positions so that they fit into the Hirth grid (depending on
the start angle, end angle and number of measuring
points).
Depending on the machine configuration, the TNC cannot
position the rotary axes automatically. If this is the case,
you need a special M function from the machine tool
builder enabling the TNC to move the rotary axes. The
machine tool builder must have entered the number of the
M function in machine parameter mStrobeRotAxPos for
this purpose.