Datum From Inside Of Circle (Cycle 412, Din/Iso: G412, Software Option 17); Cycle Run - HEIDENHAIN TNC 620 User Manual

15
Touch Probe Cycles: Automatic Datum Setting
15.6 DATUM FROM INSIDE OF CIRCLE (Cycle 412, DIN/ISO: G412,
software option 17)
15.6 DATUM FROM INSIDE OF CIRCLE
(Cycle 412, DIN/ISO: G412, software
option 17)

Cycle run

Touch Probe Cycle 412 finds the center of a circular pocket (or of a
hole) and defines its center as datum. If desired, the TNC can also
enter the coordinates into a datum table or the preset table.
1 Following the positioning logic, the TNC positions the touch
probe at rapid traverse (value from FMAX column) (see
"Executing touch probe cycles", page 294) to touch point 1. The
TNC calculates the touch points from the data in the cycle and
the safety clearance from the SET_UP column of the touch
probe table.
2 Then the touch probe moves to the entered measuring height
and runs the first probing process at the probing feed rate
(column F). The TNC derives the probing direction automatically
from the programmed starting angle.
3 Then the touch probe moves in a circular arc either at measuring
height or at clearance height to the next starting point
probes the second touch point.
4 The TNC positions the probe to starting point
4
starting point
5 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 "Characteristics common to all
touch probe cycles for datum setting", page 322) and saves the
actual values in the Q parameters listed below.
6 If desired, the TNC subsequently measures the datum in the
touch probe axis in a separate probing.
Parameter number
Q151
Q152
Q153
338
to probe the third and fourth touch points.
Meaning
Actual value of center in reference
axis
Actual value of center in minor axis
Actual value of diameter
2
and
3
and then to
TNC 620 | User's Manual Cycle Programming | 3/2014