HEIDENHAIN TNC 620 (81760x-02) - Manual (Page 223)

Path contours - Cartesian coordinates 6.4
6
TNC 620 | User's Manual
HEIDENHAIN Conversational Programming | 2/2015 223
Circular path
C around circle center CC
Before programming a circular arc, you must first enter the circle
center
CC. The last programmed tool position will be the starting
point of the arc.
Move the tool to the circle starting point
Enter the coordinates of the circle center
Enter the coordinates of the arc end point, and if
necessary:
Direction of rotation DR
Feed rate F
Miscellaneous function M
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, e.g.
C Z...
X... DR+ with a tool axis Z, and at the same time
rotate this movement, then the TNC moves the tool
in a spatial arc, which means a circular arc in 3 axes
(software option 8).
Example NC blocks
5 CC X+25 Y+25
6 L X+45 Y+25 RR F200 M3
7 C X+45 Y+25 DR+
Full circle
For the end point, enter the same point that you used for the
starting point.
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.