HEIDENHAIN TNC 620 (73498x-01) ISO programming - Manual (Page 178)

178 Programming: Programming contours
6.4 P
a
th cont
ours—Car
te
sian coor
dinat
e
s
Circular path C around circle center CC
Before programming a circular arc, you must first enter the circle
center I, J. The last programmed tool position will be the starting
point of the arc.
Direction of rotation
„ In clockwise direction: G02
„ In counterclockwise direction: G03
„ Without programmed direction: G05. The TNC traverses the circular
arc with the last programmed direction of rotation
U Move the tool to the circle starting point.
U Enter the coordinates of the circle center
U Enter the coordinates of the arc end point, and if
necessary:
U Feed rate F
U Miscellaneous function M
Example NC blocks
Full circle
For the end point, enter the same point that you used for the starting
point.
S E
X
Y
CC
X
Y
25 45
25
CC
DR+
DR–
The TNC normally makes circular movements in the active
working plane. If you program circular arcs that do not lie
in the active working plane, for example G2 Z... X...
with a tool axis Z, and at the same time rotate this
movement, then the TNC moves the tool in a spatial
circular arc, which means a circular arc in 3 axes.
N50 I+25 J+25 *
N60 G01 G42 X+45 Y+25 F200 M3 *
N70 G03 X+45 Y+25 *
The starting and end points of the arc must lie on the
circle.
Input tolerance: up to 0.016 mm (selected through the
circleDeviation
machine parameter).
Smallest possible circle that the TNC can traverse:
0.0016 µm.