HEIDENHAIN TNC 640 User Manual page 765

Manual Operation and Setup | Compensating workpiece misalignment with 3-D touch probe
17.9 Compensating workpiece misalignment
with 3-D touch probe
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 goes
from the first to the second probing point. You can also determine
the basic rotation or offset using holes or studs.
Operating and programming notes:
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 (except for PLANE AXIAL). In this
case first activate the basic rotation and then the
PLANE function.
You can also activate a basic rotation or offset
without probing a workpiece. To do so, enter a
value in the corresponding input field and press the
SET BASIC ROTATION or SET TABLE ROTATION soft
key.
The behavior of the control during presetting
depends on the setting in the machine parameter
chkTiltingAxes (no. 204601).
Further information:
HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
"Introduction", page 749
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765