Heidenhain TNC 320 (340 55x-03) Touch Probe Cycles User Manual download pdf (Page 57)

HEIDENHAIN TNC 320 57

3.1 Measuring Workpiece Misalignment

Compensating workpiece misalignment by

rotating the C axis (touch probe cycle 405,

DIN/ISO: G405)

With touch probe cycle 405, you can measure

 the angular offset between the positive Y axis of the active

coordinate system and the center of a hole, or

 the angular offset between the nominal position and the actual

position of a hole center.

The TNC compensates the determined angular offset by rotating the

C axis. The workpiece can be clamped in any position on the rotary

table, but the Y coordinate of the hole must be positive. If you

measure the angular misalignment of the hole with touch probe axis Y

(horizontal position of the hole), it may be necessary to execute the

cycle more than once because the measuring strategy causes an

inaccuracy of approx. 1% of the misalignment.

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 and positions the

touch probe on the hole centers measured.

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

aligns the workpiece by rotating the table. The TNC rotates the

rotary table so that the hole center after compensation lies in the

direction of the positive Y axis, or on the nominal position of the

hole center — both with a vertical and horizontal touch probe axis.

The measured angular misalignment is also available in parameter

Q150.

Before programming, note the following

To prevent a collision between the touch probe and the

workpiece, enter a low estimate for the nominal diameter

of the pocket (or hole).

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 57

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