HEIDENHAIN ND 920 - Manual (Page 10)

10
Datum Setting
If you want to save the datum points in nonvolatile memory,
you must first cross over the reference marks.
Only after crossing over the reference marks can you set new datums
or activate existing ones.
Probe the workpiece with the edge finder and then set the desired
datum. You can also probe two edges and set the centerline between
them as a datum (see examples), or probe four points on a circle and
set the circle center as the datum. The display unit will automatically
consider the stylus radius and length if their values are entered in
parameters P25 and P26 (see “Operating Parameters”).
There are several ways to set datums:
Touch the workpiece with the tool and then set the desired datum
(see example). You can also touch two edges and set the centerline
between them as a datum, or touch four points on a circle and set the
circle center as the datum. The tool data of the tool used for this are
automatically considered (see “Tool Compensation”).
DATUM NUMBER =
After you have set a datum it can be activated as follows:
1
Select datum setting.
Enter the number of the datum point, for
example 12.
2
ENT
Datum Setting
Y
X
2
1
Z
R = 5 mm
Datum setting with the tool
Example
Working plane X / Y
Tool axis Z
Tool radius R = 5 mm
Axis sequence for X – Y – Z
datum setting