HEIDENHAIN TNC 128 (77184x-02) - Manual (Page 310)

Manual operation and setup
11.7 Datum setting with 3-D touch probe (Touch Probe Functions
software option 17)
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TNC 128 | User's Manual HEIDENHAIN Conversational Programming | 5/2014
Measuring workpiece dimensions
Select the probing function: Press the PROBING
POS soft key
Position the touch probe at a position near the first
touch point A
Select the probing direction by soft key
Start the probing procedure: Press the machine
START button
If you need the current datum later, write down
the value that appears in the Datum display
Datum: Enter "0"
Cancel the dialog: Press the
END key
Select the probing function again: Press the
PROBING POS soft key
Position the touch probe at a position near the
second touch point B
Select the probe direction with the soft keys:
Same axis but from the opposite direction
Start the probing procedure: Press the machine
START button
The value displayed as datum is the distance between the two
points on the coordinate axis.
To return to the datum that was active before the length
measurement:
Select the probing function: Press the
PROBING POS soft key
Probe the first touch point again
Set the datum to the value that you wrote down previously
Cancel the dialog: Press the
END key