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The only effect of CC is to define a position as circle
center: The tool does not move to this position.
The circle center is also the pole for polar coordinates.
Circular path C around circle center CC
Before programming a circular path C, you must first enter the
circle center CC. The last programmed tool position before the C
block is used as the circle starting point.
Move the tool to the circle starting point.
Enter the coordinates of the circle center.
Enter the coordinates of the arc end point
Direction of rotation DR
Further entries, if necessary:
Feed rate F
Miscellaneous function M
Example NC blocks
5 CC X+25 Y+25
6
X+45 Y+25 RR F200 M3
7 C X+45 Y+25 DR+
Full circle
Enter the same point you used as the starting point for the end
point in a C block.
The starting and end points of the arc must lie on the
circle.
Input tolerance: up to 0.016 mm (selected with MP7431).
HEIDENHAIN TNC 426 B, TNC 430
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Y
E
S
CC
Y
CC
25
25
45
X
DR+
DR–
X
105
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