HEIDENHAIN TNC 407 (280 580) User Manual User Manual
Page 14
TNC 425/TNC 415 B/TNC 407
1-13
1
Introduction
Fig. 1.13:
Polar coordinates and their associated reference axes
Fig. 1.14:
The workpiece datum serves as
the origin of the Cartesian
coordinate system
Y
X
Z
Y
Z
X
CC
0
°
+
CC
Y
Z
X
0
°
+
Y
Z
X
CC
0
°
+
Setting a pole at a circle center (CC)
The pole is set by entering two Cartesian coordinates. These coordinates
also set the reference axis for the polar angle (PA).
Coordinates of the pole
Reference axis of the angle
X Y
+X
Y Z
+Y
Z X
+Z
Setting the datum
The workpiece drawing identifies a certain prominent point on the work-
piece (usually a corner) as the absolute datum and perhaps one or more
other points as relative datums. The process of datum setting establishes
these points as the origin of the absolute or relative coordinate systems:
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 position value (e.g. to compensate the tool radius).