HEIDENHAIN TNC 640 User Manual page 324

7
Circle center CC, radius and direction of rotation in the FC/FCT
block
The control 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 programmed or automatically calculated circle center
or pole is effective only in connected conventional or FK
sections. If an FK section splits up two conventionally
programmed sections, the information about a circle
center or pole will be lost. The two conventionally
programmed sections must each have their own
(if necessary, identical) CC blocks. Conversely, this
information will also be lost if there is a conventional
section between two FK sections.
Soft keys
Example
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
324
Programming Contours | Path contours – FK free contour programming
Known data
Circle center in Cartesian coordinates
Center point in polar coordinates
Rotational direction of the arc
Radius of an arc
HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017