User's Manual TNC 360 (from 259 900-11) - heidenhain

5 Programming Tool Movements
5.4 Path Contours – Cartesian Coordinates
Circle and circular arcs
5-14
The TNC can control two machine axes simultaneously
to move the tool in a circular path.
Circle Center CC
You can define a circular movement by entering its
center CC.
A circle center can also serve as reference (pole) for
polar coordinates.
Direction of Rotation DR
When there is no tangential transition to another
contour element, enter the mathematical direction
of rotation DR, where
• a clockwise direction of rotation is mathematically
negative: DR-
• a counterclockwise direction of rotation is
mathematically positive: DR+
Y
Fig. 5-17: Circular arc and circle center
Y
Z
Y
Y CC
Fig. 5.18: Circle center coordinates
DR–
DR+
CC CC
Fig. 5.19: Direction of rotation for circular movements
X
Z
Y
Y
CC
CC
CC
X CC
X CC
X
X
X
TNC 360