HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 234)

8 Programming: Cycles 218
MULTIPASS MILLING (Cycle G230)
1 From the current position, the TNC positions the tool at rapid
traverse in the working plane to the starting position. During
this movement, the TNC also offsets the tool by its radius to the
left and upward.
2 The tool then moves at rapid traverse in the tool axis to set-up
clearance. From there it approaches the programmed starting
position in the tool axis at the feed rate for plunging.
3 The tool subsequently advances to the stopping point 2 at the
feed rate for milling. The stopping point is calculated from the
programmed starting point, the programmed length and the tool
radius.
4 The TNC offsets the tool to the starting point in the next pass at
the stepover feed rate. The offset is calculated from the
programmed width and the number of cuts.
5 The tool then returns in the negative direction of the first axis.
6 Multipass milling is repeated until the programmed surface has
been completed.
7 At the end of the cycle, the tool is retracted in rapid traverse to
set-up clearance.
8.8 Cy
cles f
or F
ace Milling
X
Y
Z
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