HEIDENHAIN TNC 620 User Manual page 175

Three-dimensional movement
The program block contains three coordinates. The TNC thus
moves the tool in space 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 plane is defined automatically when you set the
spindle axis during a TOOL CALL:
Spindle axis
Z
Y
X
You can program circles that do not lie parallel
to a main plane by using the function for tilting
the working plane (see User's Manual for Cycles,
Cycle 19, WORKING PLANE) or Q parameters (See
"Principle and overview of functions").
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+
TNC 620 | User's Manual
HEIDENHAIN Conversational Programming | 5/2013
Main plane
XY, also UV, XY, UY
ZX, also WU, ZU, WX
YZ, also VW, YW, VZ
Fundamentals of Path Functions
6
6.2
175