HEIDENHAIN TNC 426, TNC 430 141
6.4 Path Contours — Cartesian Coordinates
Inserting a chamfer CHF between two straight
lines
The chamfer enables you to cut off corners at the intersection of two
straight lines.
n The blocks before and after the CHF block must be in the same
working plane.
n The radius compensation before and after the chamfer block must
be the same.
n An inside chamfer must be large enough to accommodate the
current tool.
U Chamfer side length: Length of the chamfer
Further entries, if necessary:
U Feed rate F (only effective 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.
X
Y
X
Y
40
12
30
5
12
5
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