HEIDENHAIN TNC 640 (34059x-01) ISO programming - Manual (Page 176)

176 Programming: Programming Contours
6.2 F
undamentals of P
a
th F
unctions
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:
X
Y
X
Y
CC
X
CC
Y
CC
Spindle axis Main plane
(G17) XY, also
UV, XV, UY
(G18) ZX, also
WU, ZU, WX
(G19) YZ, also
VW, YW, VZ
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",
page 220).