HEIDENHAIN TNC 620 (81760x-01) Cycle programming - Manual (Page 339)

DATUM FROM INSIDE OF CIRCLE (Cycle 412, DIN/ISO: G412,
software option 17)
15.6
15
TNC 620 | User's Manual Cycle Programming | 3/2014
339
Please note while programming:
Danger of collision!
To prevent a collision between the touch probe and
the workpiece, enter a
low estimate for the nominal
diameter of the pocket (or hole).
If the dimensions of the pocket and the safety
clearance do not permit pre-positioning in the
proximity of the touch points, the TNC always starts
probing from the center of the pocket. In this case
the touch probe does not return to the clearance
height between the four measuring points.
The smaller the angle increment Q247, the less
accurately the TNC can calculate the datum.
Minimum input value: 5°.
Before a cycle definition you must have programmed
a tool call to define the touch probe axis.
If you set a datum (Q303 = 0) with the touch probe
cycle and also use probe in TS axis (Q381 = 1), then
no coordinate transformation must be active.