Heidenhain TNC 320 (340 55x-03) Touch Probe Cycles User Manual download pdf (Page 81)

HEIDENHAIN TNC 320 81

3.2 Presetting automatically

DATUM FROM OUTSIDE OF CIRCLE

(touch probe cycle 413, DIN/ISO: G413)

Touch probe cycle 413 finds the center of a circular stud and defines

it 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 “Running touch

probe cycles” on page 21) to the starting point 1. The TNC

calculates the probe starting 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 2 and probes

the second touch point.

4 The TNC positions the probe to starting point 3 and then to starting

point 4 to probe the third and fourth touch points.

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 “Saving the calculated datum”

on page 64) 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 Meaning

Q151 Actual value of center in reference axis

Q152 Actual value of center in minor axis

Q153 Actual value of diameter

Before programming, note the following

To prevent a collision between touch probe and

workpiece, enter a high estimate for the nominal diameter

of the stud.

Before a cycle definition you must have programmed a

tool call to define the touch probe axis.

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Heidenhain TNC 320 (340 55x-03) Touch Probe Cycles User Manual Page 81