HEIDENHAIN TNC 640 (34059x-02) Cycle programming - Manual (Page 112)

Fixed Cycles: Tapping / Thread Milling
4.5 Fundamentals of Thread Milling
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TNC 640 | User's Manual Cycle Programming | 5/2013
Danger of collision!
Always program the same algebraic sign for the
infeeds: Cycles comprise several sequences of
operation that are independent of each other.
The order of precedence according to which the
work direction is determined is described with the
individual cycles. For example, if you only want to
repeat the countersinking process of a cycle, enter 0
for the thread depth. The work direction will then be
determined from the countersinking depth.
Procedure in case of a tool break
If a tool break occurs during thread cutting, stop
program run, change to the Positioning with MDI
operating mode and move the tool on a linear path to
the hole center. You can then retract the tool in the
infeed axis and replace it.