HEIDENHAIN TNC 620 User Manual page 531

Compensating workpiece misalignment with 3-D touch probe
Measuring 3-D basic rotation
The misalignment of any tilted plane can be measured by probing 3
positions. The Probe in plane function enables you to measure this
misalignment and save it as a 3-D basic rotation in the preset table.
Please take the following into account when
selecting probe points:
The sequence and position of the touch points
determines how the TNC calculates the direction of
the plane.
With the first two points you specify the direction
of the reference axis. Define the second point in the
positive direction of the desired reference axis. The
position of the third point determines the direction
of the minor axis and tool axis. Define the third
point in the positive Y axis of the desired workplace
coordinate system.
1ST point: On the reference axis
2ND point: On the reference axis, in a positive
direction from the first point
3RD point: On the minor axis, in a positive
direction of the desired workpiece coordinate
system
Optionally inputting a datum angle enables you to define the
nominal direction of the probed plane.
Select the probing function: Press the PROBING
PL soft key. The TNC then displays the current 3-D
basic rotation
Position the touch probe at a position near the first
touch point
Select the probe direction or probing routine by
soft key
Probe: Press the NC START key
Position the touch probe at a position near the
second touch point
Probe: Press the NC START key
Position the touch probe near the third touch point
Probe: Press the NC START key. The TNC
measures the 3-D basic rotation and displays the
values for SPA, SPB and SPC in relation to the
active coordinate system
If required, enter the datum angle
Activate 3-D basic rotation:
Press the SET BASIC ROTATION soft key
Saving a 3-D basic rotation in the preset table:
Press the BASIC ROT. IN PRESET TABLE soft key
To terminate the probe function, press the END
soft key
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
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