HEIDENHAIN TNC 370 User Manual page 244

8 Cycles
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8.6 Cycles for Multipass Milling
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MULTIPASS MILLING (Cycle
230)
* from the cutrent position, the
TNC positions the tooI autm-mtically at the starting p&t af the first machining
opsrMm, first in the working
planet
end then in the bol axis. Pm-p&ion the &ml in such a way that there is
no danger of collision with the wcirkpiece or fixtures.
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Process
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From the current position, the TNC positions
the tool at rapid traverse in the working plane to
starting point 0. In the process, the TNC
offsets the tool by the tool radius to the left and
to the top.
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The tool subsequently moves at rapid traverse
in the tool axis to the setup clearance and after
this at the positioning feed rate to the pro-
grammed starting position in the tool axis.
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The tool moves at the programmed milling feed
rate to stopping point 0. The TNC calculates
the stopping point from the programmed
starting point, the programmed length and the
tool radius.
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The TNC offsets the tool at the stepover feed
rate to the starting point of the next pass. The
TNC calculates the offset from the programmed Fig. 8.61: MULTIPASS MILLING cycle
width and the number of cuts.
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After this, the tool moves in the negative
X direction back to the starting point 0.
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Multipass milling is repeated until the pro-
grammed surface has been completely ma-
chined.
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At the end the TNC moves the tool in rapid
traverse back to the setup clearance.
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TNC 370
8-55