HEIDENHAIN TNC 320 User Manual page 347

15.10 DATUM CIRCLE CENTER
(Cycle 416, DIN/ISO: G416)
Cycle run
Touch Probe Cycle 416 finds the center of a bolt hole circle and
defines its center as datum. If desired, the TNC can also enter the
coordinates into a datum table or the preset table.
1 The TNC positions the touch probe at rapid traverse (value from
column FMAX) following the positioning logic (see "Executing
touch probe cycles" on page 285) to the center of the first hole 1.
2 Then the probe moves to the entered measuring height and
probes four points to find the first hole center.
3 The touch probe returns to the clearance height and then to the
position entered as center of the second hole 2.
4 The TNC moves the touch probe to the entered measuring height
and probes four points to find the second hole center.
5 The touch probe returns to the clearance height and then to the
position entered as center of the third hole 3.
6 The TNC moves the touch probe to the entered measuring height
and probes four points to find the third hole center.
7 Finally the TNC returns the touch probe to the clearance height and
processes the determined datum depending on the cycle
parameters Q303 and Q305 (see "Saving the calculated datum"
on page 314) and saves the actual values in the Q parameters
listed below.
8 If desired, the TNC subsequently measures the datum in the touch
probe axis in a separate probing.
Parameter number Meaning
Q151 Actual value of center in reference axis
Q152 Actual value of center in minor axis
Q153 Actual value of bolt hole circle diameter
HEIDENHAIN TNC 320 347