Heidenhain TNC 320 (340 55x-03) Touch Probe Cycles User Manual download pdf (Page 85)

HEIDENHAIN TNC 320 85

3.2 Presetting automatically

DATUM FROM OUTSIDE OF CORNER

(touch probe cycle 414, DIN/ISO: G414)

Touch probe cycle 414 finds the intersection of two lines and defines

it as the datum. If desired, the TNC can also enter the intersection into

a datum table or preset table.

1 Following the positioning logic (see “Running touch probe cycles”

on page 21), the TNC positions the touch probe at rapid traverse

(value from FMAX column) to the first touch point 1 (see figure at

upper right). The TNC offsets the touch probe by the safety

clearance in the direction opposite the respective traverse

direction.

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 3rd measuring point.

3 Then the touch probe moves to the next starting position 2 and

probes the second position.

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 coordinates of the determined corner in

the Q parameters listed below

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

probe axis in a separate probing.

The TNC always measures the first line in the direction of

the minor axis of the working plane.

Parameter number Meaning

Q151 Actual value of corner in reference axis

Q152 Actual value of corner in minor axis

Before programming, note the following

By defining the positions of the measuring points 1 and 3

you also determine the corner at which the TNC sets the

datum (see figure at right and table at lower right).

Before a cycle definition you must have programmed a

tool call to define the touch probe axis.

1 2 ... 80 81 82 83 84 85 86 87 88 89 90 ... 164 165

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Heidenhain TNC 320 (340 55x-03) Touch Probe Cycles User Manual Page 85