HEIDENHAIN TNC 640 (34059x-02) ISO programming - Manual (Page 479)

Compensating workpiece misalignment with 3-D touch probe 15.8
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TNC 640 | User's Manual for DIN/ISO Programming | 5/2013
479
15.8 Compensating workpiece
misalignment with 3-D touch probe
Introduction
HEIDENHAIN only gives warranty for the function of
the probing cycles if HEIDENHAIN touch probes are
used.
The TNC electronically compensates workpiece misalignment by
computing a "basic rotation."
For this purpose, the TNC sets the rotation angle to the desired
angle with respect to the reference axis in the working plane. See
figure at right.
The TNC saves the basic rotation, depending on the tool axis, in the
columns SPA, SPB or SPC of the preset table.
To identify the basic rotation, probe two points on the side of the
workpiece. The sequence of probing the points is not important.
You can also identify the basic rotation by holes or studs.
Select the probe direction perpendicular to the
angle reference axis when measuring workpiece
misalignment.
To ensure that the basic rotation is calculated
correctly during program run, program both
coordinates of the working plane in the first
positioning block.
You can also use a basic rotation in conjunction with
the PLANE function. In this case, first activate the
basic rotation and then the PLANE function.
You can also activate a basic rotation without probing
a workpiece. For this purpose enter a value in the
basic rotation menu and press the SET BASIC
ROTATION soft key.