246 Programming: Programming Contours
6.6 Path Contours—FK Free Contour Programming
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.
Example NC blocks
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conventionally is then no longer valid as a pole or circle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 Soft keys
Circle center in Cartesian coordinates
Circle center in polar coordinates
Rotational direction of an arc
Radius of an arc
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
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