Setting the pole -13 datum setting -13 – HEIDENHAIN TNC 407 (280 580) ISO Programming User Manual
Page 31
TNC 426/TNC 425/TNC 415 B/TNC 407
1-13
1
Introduction
Fig. 1.13:
The workpiece datum represents
the origin of the Cartesian
coordinate system
Fig. 1.12:
Polar coordinates and their associated reference axes
Y
X
Z
Y
Z
X
0
°
+
I
J
J
Y
Z
X
0
°
+
K
Y
Z
X
I
0
°
+
K
Setting the pole
The pole is set by entering two Cartesian coordinates. These coordinates
also determine the reference axis for the polar angle H.
Coordinates of the pole
Angle reference axis
I J
+X
J K
+Y
K I
+Z
Datum setting
The workpiece drawing identifies a certain point on the workpiece (usually
a corner) as the “absolute datum” and perhaps one or more other points
as relative datums. The datum setting procedure establishes these points
as the origin of the absolute or relative coordinate system. The
workpiece, which is aligned with the machine axes, is moved to a certain
position relative to the tool and the display is set either to zero or to
another appropriate value (e.g., to compensate the tool radius).