Heidenhain TNC 320 (340 55x-03) Touch Probe Cycles User Manual download pdf (Page 71)

HEIDENHAIN TNC 320 71

3.2 Presetting automatically

DATUM FROM INSIDE OF RECTANGLE

(touch probe cycle 410, DIN/ISO: G410)

Touch probe cycle 410 finds the center of a rectangular pocket 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 either paraxially at the measuring

height or linearly at the 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)

6 If desired, the TNC subsequently measures the datum in the touch

probe axis in a separate probing and saves the actual values in the

following Q parameters.

Parameter number Meaning

Q151 Actual value of center in reference axis

Q152 Actual value of center in minor axis

Q154 Actual value of length in the reference

axis

Q155 Actual value of length in the minor axis

Before programming, note the following

To prevent a collision between touch probe and

workpiece, enter low estimates for the lengths of the 1st

and 2nd sides.

If the dimensions of the pocket 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 pocket. In this case the touch probe does not return to

the clearance height between the four measuring points.

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 71

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