HEIDENHAIN TNC 426 (280 476) - Manual (Page 62)

HEIDENHAIN TNC 426, TNC 430 35
4.1 F
undamentals
Reference system on milling machines
When using a milling machine, you orient tool movements to the
Cartesian coordinate system. The illustration at right shows how the
Cartesian coordinate system describes the machine axes. The figure
at center right illustrates the “right-hand rule” for remembering the
three axis directions: the middle finger is pointing in the positive
direction of the tool axis from the workpiece toward the tool (the Z
axis), the thumb is pointing in the positive X direction, and the index
finger in the positive Y direction.
The TNC 426 can control a machine tool in up to 5 axes; the TNC 430
controls up to 9 axes. The axes U, V and W are secondary linear axes
parallel to the main axes X, Y and Z, respectively. Rotary axes are
designated as A, B and C. The illustration at lower right shows the
assignment of secondary axes and rotary axes to the main axes.
+X
+Y
+Z
+X
+Z +Y
W+
C+
B+
V+ A+
U+
Y
X
Z