Heidenhain TNC 320 (340 55x-03) Touch Probe Cycles User Manual download pdf (Page 133)

HEIDENHAIN TNC 320 133

3.3 Automatic Workpiece Measurement

MEAS. BOLT HOLE CIRC (touch probe cycle 430,

DIN/ISO: G430)

Touch probe cycle 430 finds the center and diameter of a bolt hole

circle by probing three holes. If you define the corresponding tolerance

values in the cycle, the TNC makes a nominal-to-actual value

comparison and saves the deviation value in system parameters.

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 point entered as 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 touch probe returns to the clearance height and then to the

position entered as center of the third hole 3.

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

and probes four points to find the third hole center.

7 Finally the TNC returns the touch probe to the clearance height and

saves the actual values and the deviations in the following Q

parameters:

Parameter number Meaning

Q151 Actual value of center in reference axis

Q152 Actual value of center in minor axis

Q153 Actual value of bolt hole circle diameter

Q161 Deviation from center of reference axis

Q162 Deviation from center of minor axis

Q163 Deviation of bolt hole circle diameter

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 133