1 f undamentals – HEIDENHAIN TNC 640 (34059x-01) Cycle programming User Manual
Page 401

HEIDENHAIN TNC 640
401
16.1 F
undamentals
Characteristics common to all touch probe 
cycles for datum setting
Datum point and touch probe axis
From the touch probe axis that you have defined in the measuring 
program the TNC determines the working plane for the datum: 
415 DATUM INSIDE CORNER 
Measuring two lines from the inside of a 
corner, and defining the intersection as 
datum
416 DATUM CIRCLE CENTER (2nd soft-
key row) Measuring any three holes on a 
bolt hole circle, and defining the bolt-
hole center as datum
417 DATUM IN TS AXIS (2nd soft-key 
row) Measuring any position in the touch 
probe axis and defining it as datum
418 DATUM FROM 4 HOLES (2nd soft-
key row) Measuring 4 holes crosswise 
and defining the intersection of the lines 
between them as datum
419 DATUM IN ONE AXIS (2nd soft-key 
row) Measuring any position in any axis 
and defining it as datum
Cycle
Soft key
Page
You can also run the Touch Probe Cycles 408 to 419 during 
an active basic rotation.
The tilting the working plane function is not permitted in 
combination with Cycles 408 to 419.
Active touch probe axis
Datum setting in
Z
X and Y
Y
Z and X
X
Y and Z
