HEIDENHAIN TNC 320 (34055x-06) Cycle programming - Manual (Page 286)

Touch Probe Cycles: Automatic Datum Setting
15.2 DATUM SLOT CENTER (Cycle 408, DIN/ISO: G408)
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TNC 320 | User's Manual Cycle Programming | 5/2013
15.2 DATUM SLOT CENTER (Cycle 408, DIN/
ISO: G408)
Cycle run
Touch Probe Cycle 408 finds the center of a slot 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
FMAX column) following the positioning logic (See "Executing
touch probe cycles", page 259) to the starting 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).
3 Then the touch probe moves either paraxially at measuring
height or at clearance height to the next starting point 2 and
probes the second touch point.
4 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 "") and saves the actual values
in the Q parameters listed below.
5 If desired, the TNC subsequently measures the datum in the
touch probe axis in a separate probing.
Parameter number Meaning
Q166 Actual value of measured slot width
Q157 Actual value of the centerline
Please note while programming:
Danger of collision!
To prevent a collision between touch probe and
workpiece, enter a
low estimate for the slot width.
If the slot width 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 slot. In this case the touch probe does
not return to the clearance height between the two
measuring points.
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.