HEIDENHAIN TNC 320 User Manual page 298

14.4 BASIC ROTATION over
Two Studs (Cycle 402,
DIN/ISO: G402)
Cycle run
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. As
an alternative, you can also compensate the determined misalignment
by rotating the rotary table.
1 Following the positioning logic (see "Executing touch probe
cycles" on page 285), the TNC positions the touch probe at rapid
traverse (value from column FMAX) to the starting point
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 positions
the probe to starting point
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.
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
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5 of the second stud.
Touch Probe Cycles: Automatic Measurement of Workpiece Misalignment
1 of the