Heidenhain TNC 320 (340 55x-03) Touch Probe Cycles User Manual download pdf (Page 49)

HEIDENHAIN TNC 320 49

3.1 Measuring Workpiece Misalignment

BASIC ROTATION over two studs (touch probe

cycle 402, DIN/ISO: G402)

The touch probe cycle 402 measures the centers of two studs. Then

the TNC calculates the angle between the reference axis in the

working plane and the line connecting the two stud centers. With the

basic rotation function, the TNC compensates the calculated value

(See also \gCompensating Workpiece Misalignment” on page 32). As

an alternative, you can also compensate the determined misalignment

by rotating the rotary table.

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

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

(value from column FMAX) to the starting point 1 of the first stud.

2 Then the probe moves to the entered measuring height 1 and

probes four points to find the center of the first stud. The touch

probe moves on a circular arc between the touch points, each of

which is offset by 90°.

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

starting point for probing 5 the second stud.

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

2 and probes four points to find the center of the second stud.

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

performs the basic rotation.

Before programming, note the following

Before a cycle definition you must have programmed a

tool call to define the touch probe axis.

The TNC will reset an active basic rotation at the beginning

of the cycle.

This touch probe cycle is not allowed when the tilted

working plane function is active.

If you want to compensate the misalignment by rotating

the rotary table, the TNC will automatically use the

following rotary axes:

 C for tool axis Z

 B for tool axis Y

 A for tool axis X

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Heidenhain TNC 320 (340 55x-03) Touch Probe Cycles User Manual Page 49