HEIDENHAIN ND 920 - Manual (Page 13)

13
Datum Setting
Datum setting with the KT edge finder
Your display unit offers the following probing functions:
PROBE EDGE Set workpiece edge as datum
PROBE MIDPOINT Set centerline between two workpiece edges
as datum
PROBE CIRCLE Set a circle center as datum
The probing functions can be accessed in operating mode SPEC FCT.
The HEIDENHAIN KT 120 edge finder only functions with
electrically conductive workpieces.
Before you can use the edge finder you must enter the stylus diameter
in parameter P25 and the stylus length in P26 (see “Operating Para-
meters”).
The stylus dimensions you enter are considered during all probing
operations.
PROBE EDGE and PROBE MIDPOINT are described on the following
pages.
The sequence for PROBE CIRCLE is similar; however, you must probe
four points before the circle center can be calculated. The circle center
can then be set as the new datum.