HEIDENHAIN TNC 406 - Manual (Page 43)

22 2 Manual Operation, Setup and Probing Functions
2.3 D
a
tu
m Set
ting
2.3 Datum Setting
The production drawing identifies a certain form element of the
workpiece (usually a corner) as the absolute datum, and usually one or
more form elements as relative datums (see ”Setting the datum” on
page 47). Through the datum setting process, the origin of the
absolute or relative coordinate systems is set to these datums:
The workpiece – aligned to the machine axes – is brought into a certain
position relative to the electrode, and the display is set to zero or the
appropriate position value (i.e., to account for the electrode radius).
Example
Coordinates of Point 1:
The datum of the rectangular coordinate system is located
negative 10 mm on the X axis and negative 5 mm on the Y axis from
Point 1.
The fastest, easiest and most accurate way of setting the datum is by
using the probing functions for datum determination.
Y
X
Z
Y
X
Z
1
10
5
X = 10 mm
Y = 5 mm
Z = 0 mm