HEIDENHAIN TNC 620 User Manual page 529

Outside circle:
Position the touch probe at a position near the first
touch point outside of the circle
Select the touch probe function: Press the
PROBING CC soft key
Select the soft key for the desired probing
direction
Probe: Press the NC START key. The touch probe
probes the inside wall of the circle in the selected
direction. Repeat this process. After the third
probing operation, you can have the TNC calculate
the center (four touch points are recommended)
Terminate the probing procedure and switch to the
evaluation menu: Press the EVALUATE soft key
Datum: Enter the coordinates of the datum,
confirm with the SET DATUM soft key or write
values to a table
Further Information:
from the touch probe cycles to a datum table,
page 511
Further Information:
from the touch probe cycles to the preset table,
page 512)
Terminate the probe function by pressing the END
soft key
Once the probing routine is completed, the TNC displays the
current coordinates of the circle center and the circle radius.
HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2015
Datum setting with a 3-D touch probe 14.10
Writing measured values
Writing measured values
14
529