HEIDENHAIN TNC 620, User Manual

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Setup | Compensating workpiece misalignment with 3-D touch probe (option 17)
5.9 Compensating workpiece misalignment
with 3-D touch probe (option 17)
Introduction
Refer to your machine manual.
It depends on the machine whether you can compensate
workpiece misalignment with an offset (angle for table
rotation).
HEIDENHAIN only gives warranty for the function of the
probing cycles if HEIDENHAIN touch probes are used.
The control compensates workpiece misalignment either
mathematically by computing a basic rotation (angle of basic
rotation) or by an offset (angle for table rotation)
For this purpose, the control sets the rotation angle to the desired
angle with respect to the reference axis in the working plane.
Basic rotation: The control interprets the measured angle as rotation
around the tool direction, and saves the values in the columns SPA,
SPB, or SPC of the preset table.
Offset: The control interprets the measured angle as a shift in each
axis in the machine coordinate system, and saves the values in the
columns A_OFFS, B_OFFS, or C_OFFS of the preset table.
In order to identify the basic rotation or offset, probe two points
on the side of the workpiece. The sequence in which you probe
the points influences the calculated angle. The measured angle
is measured from the first to the second touch point. You can
also determine the basic rotation or offset using holes or studs. In
this case, however, a consistent working plane is required. When
calculating the basic rotation, the system uses the input coordinate
system (I-CS).
To determine the basic rotation in an actively tilted working plane,
please remember:
If the current coordinates of the rotary axes and the defined tilt
angles (3-D ROT menu) match, the working plane is consistent.
Thus, the basic rotation is calculated in the input coordinate
system (I-CS), based on the tool axis.
If the current coordinates of the rotary axes and the defined
tilt angles (3-D ROT menu) do not match, the working plane
is inconsistent. Thus, the basic rotation is calculated in the
workpiece coordinate system (W-CS), based on the tool axis.
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HEIDENHAIN | TNC 620 | User's Manual for Setup, Testing and Running NC Programs | 01/2022
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