TNC 426/TNC 425/TNC 415 B/TNC 407
2 - 1 9
2
Manual Operation and Setup
Fig. 2.18
:
Second soft-key row for TOUCH PROBE
Setting the Datum with a 3D Touch Probe
Setting datum points over holes
A second soft-key row provides soft keys for using
holes to set datums.
The touch probe is used in the same way as in the
"circle center as datum" function (see page 2-17).
First pre-position it in the approximate center of a
hole, then press the machine START button to
automatically probe four points in the hole.
Move the touch probe to the next hole and have
the TNC repeat the probing procedure until all the
holes have been probed to set datums.
Function
Soft key
Basic rotation from 2 holes:
The TNC measures the angle between the line connecting the centers
of two holes and a nominal angular position (angle reference axis).
Datum from 4 holes:
The TNC calculates the intersection of the line connecting the first two probed
holes with the line connecting the last two probed holes. If a basic rotation was
already made from the first two holes, these holes do not need to be probed again.
Circle center from 3 holes:
The TNC calculates a circle that intersects the centers of all three holes,
and finds the center.
