HEIDENHAIN TNC 640 (34059x-02) - Manual (Page 208)

Programming: Programming contours
6.4 Path contours - Cartesian coordinates
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TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 5/2013
Inserting a chamfer between two straight lines
The chamfer enables you to cut off corners at the intersection of
two straight lines.
The line blocks before and after the
CHF block must be in the
same working plane as the chamfer.
The radius compensation before and after the
CHF block must
be the same
The chamfer must be machinable with the current tool
Chamfer side length: Length of the chamfer, and
if necessary:
Feed rate F (effective only in CHF block)
Example NC blocks
7 L X+0 Y+30 RL F300 M3
8 L X+40 IY+5
9 CHF 12 F250
10 L IX+5 Y+0
You cannot start a contour with a CHF block.
A chamfer is possible only in the working plane.
The corner point is cut off by the chamfer and is not
part of the contour.
A feed rate programmed in the CHF block is effective
only in that block. After the
CHF block, the previous
feed rate becomes effective again.