HEIDENHAIN TNC 620 User Manual page 213

Path contours – FK free contour programming (Advanced
Circle center CC, radius and direction of rotation in the FC/FCT
block
The TNC calculates a circle center for free-programmed arcs from
the data you enter. This makes it possible to program full circles in
an FK program block.
If you wish to define the circle center in polar coordinates you must
use FPOL, not CC, to define the pole. FPOL is entered in Cartesian
coordinates and remains in effect until the control encounters a
block in which another FPOL is defined.
A circle center that was calculated or programmed
conventionally is then no longer valid as a pole or
circle center for the new FK contour: If you enter
conventional polar coordinates that refer to a pole
from a CC block you have defined previously, then
you must enter the pole again in a CC block after the
FK contour.
Known data
Circle center in Cartesian coordinates
Center point in polar coordinates
Rotational direction of the arc
Radius of an arc
Example NC blocks
10 FC CCX+20 CCY+15 DR+ R15
11 FPOL X+20 Y+15
12 FL AN+40
13 FC DR+ R15 CCPR+35 CCPA+40
TNC 620 | User's Manual
HEIDENHAIN Conversational Programming | 5/2013
Programming Features software option)
Soft keys
6
6.6
213