Heidenhain TNC 320 (340 55x-03) Touch Probe Cycles User Manual download pdf (Page 114)

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3.3 Automatic Workpiece Measurement

MEASURE HOLE (touch probe cycle 421,

DIN/ISO: G421)

Touch probe cycle 421 measures the center and diameter of a hole (or

circular pocket). 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

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

runs the first probing process at the probing feed rate (column F).

The TNC derives the probing direction automatically from the

programmed starting angle.

3 Then the touch probe moves in a circular arc either at measuring

height or at 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

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 diameter

Q161 Deviation from center of reference axis

Q162 Deviation from center of minor axis

Q163 Deviation from diameter

Before programming, note the following

Before a cycle definition you must have programmed a

tool call to define the touch probe axis.

1 2 ... 109 110 111 112 113 114 115 116 117 118 119 ... 164 165

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Heidenhain TNC 320 (340 55x-03) Touch Probe Cycles User Manual Page 114