User`s manual for cycle programming

BASIC ROTATION over two holes (Cycle 401, DIN/ISO: G401) 14.3

HEIDENHAIN | TNC 640 | User’s manual for cycle programming | 9/2015

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14.3 BASIC ROTATION over two holes

(Cycle 401, DIN/ISO: G401)

Cycle run

The Touch Probe Cycle 401 measures the centers of two holes.

Then the TNC calculates the angle between the reference axis in

the working plane and the line connecting the hole centers. With

the basic rotation function, the TNC compensates the calculated

value. As an alternative, you can also compensate the determined

misalignment by rotating the rotary table.

1 Following the positioning logic, the TNC positions the touch

probe at rapid traverse (value from FMAX column) (see

"Executing touch probe cycles", page 454) 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 Then the TNC returns the touch probe to the clearance height

and performs the basic rotation.

Please note while programming:

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.

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