Heidenhain TNC 320 (340 55x-03) Touch Probe Cycles User Manual download pdf (Page 96)

3.2 Presetting automatically

Datum at center of 4 holes (touch probe cycle

418, DIN/ISO: G418)

Touch probe cycle 418 calculates the intersection of the lines

connecting opposite corners of a rectangle defined by four hole

centers. If desired, the TNC can also enter the intersection into a

datum table or preset table.

1 The TNC positions the touch probe at rapid traverse (value from

column FMAX) and with positioning logic (see “Running touch

probe cycles” on page 21) to the center of the first hole 1.

2 Then the probe moves to the entered measuring height and

probes four points to find the first hole center.

3 The touch probe returns to the clearance height and then to the

position entered as center of the second hole 2.

4 The TNC moves the touch probe to the entered measuring height

and probes four points to find the second hole center.

5 The TNC repeats steps 3 and 4 for the holes 3 and 4.

6 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). The TNC calculates the datum as the intersection of

the lines connecting the centers of holes 1/3 and 2/4 and saves

the actual values in the Q parameters listed below.

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

probe axis in a separate probing.

Parameter number Meaning

Q151 Actual value of intersection point in

reference axis

Q152 Actual value of intersection point in

minor axis

Before programming, note the following

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 96