Heidenhain TNC 320 (340 55x-03) Touch Probe Cycles User Manual download pdf (Page 68)

3.2 Presetting automatically

DATUM RIDGE CENTER (touch probe cycle 409,

DIN/ISO: G409)

Touch probe cycle 409 finds the center of a ridge 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 “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

probes the first touch point at the probing feed rate (column F).

3 Then the touch probe moves at clearance height to the next touch

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 “Saving the calculated datum”

on page 64) 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 ridge width

Q157 Actual value of the centerline

Before programming, note the following

To prevent a collision between touch probe and

workpiece, enter a high estimate for the ridge width.

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 68