HEIDENHAIN TNC 620 User Manual page 239

Three-dimensional movement
The NC block contains three coordinates. The TNC thus moves the
tool spatially to the programmed position.
Example
N50 G01 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 with I and J.
When you program a circle, the control assigns it to one of the
main planes. This main plane for a T must be defined when the
spindle axis is set:
Spindle axis
(G17)
(G18)
(G19)
You can program circles that do not lie parallel to a
main plane by using the function for Tilt working
plane or with Q parameters.
Further Information:
the working plane (software option 8)", page 435
Further Information:
functions", page 324
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: G02/G12
Counterclockwise direction of rotation: G03/G13
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
Main plane
XY, also UV, XV, UY
ZX, also WU, ZU, WX
YZ, also VW, YW, VZ
"The PLANE function: Tilting
"Principle and overview of
Fundamentals of path functions
6
6.2
239