HEIDENHAIN TNC 620 User Manual page 211

Three-dimensional movement
The NC block contains three coordinates. The TNC thus moves the
tool spatially to the programmed position.
Example
L X+80 Y+0 Z-10
Circles and circular arcs
The TNC moves two axes simultaneously on a circular path relative
to the workpiece. You can define a circular movement by entering
the circle center CC .
When you program a circle, the control assigns it to one of the
main planes. This main plane for a TOOL CALL must be defined
when the spindle axis are set:
Spindle axis
Z
Y
X
You can program circles that do not lie parallel to
a main plane using the Tilt working plane function
or Q parameters. Further information: Cycle
Programming User's
Principle and overview of functions, page 300
Direction of rotation DR for circular movements
When a circular path has no tangential transition to another contour
element, enter the direction of rotation as follows:
Clockwise direction of rotation: DR-
Counterclockwise direction of rotation: DR+
HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2015
Main plane
XY, also UV, XV, UY
ZX, also WU, ZU, WX
YZ, also VW, YW, VZ
ManualFurther Information:
Fundamentals of path functions
6
6.2
211