HEIDENHAIN PT 880 - Manual (Page 26)

26 I Operating Instructions
I – 3 A
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I – 3 Actual Value
Datum Setting: Approaching Positions and
Entering Actual Values
The easiest way to set datum points is to use the POSITIP 880's
probing functions – regardless of whether you probe the workpiece
with the HEIDENHAIN KT Edge Finder or with a tool. Description of
the probing functions: See "Probing Functions for Datum Setting" on
page 28
Of course, you can also set datum points in the conventional manner
by touching the edges of the workpiece one after the other with the
tool and entering the tool positions as datum points (see examples
following this page).
The datum table can hold up to 99 datum points. In most cases this
will free you from having to calculate the axis travel when working
with complicated workpiece drawings containing several datums.
Datum settings are performed in the ACTUAL VALUE operating mode
and define the relationships between the axis positions and the
display values. If necessary, the datum table’s values may be changed
by entering a value directly.
See Job Setup for setting the datum value directly.
Datum selection (Mill only)
In ACTUAL VALUE mode, the Up/Down arrow keys may be used to
select the next or previous datum number.
Tool selection (Turn only)
In ACTUAL VALUE mode, the Up/Down arrow keys may be used to
select the next or previous tool number.