HEIDENHAIN TNC 620 User Manual page 46

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1.1 Introduction
Frequently recurring machining cycles that comprise several
working steps are stored in the TNC memory as standard cycles.
Coordinate transformations and several special functions are also
available as cycles. Most cycles use Q parameters as transfer
parameters.
Danger of collision!
Cycles execute extensive operations. Danger of collision!
You should run a program test before machining
If you use indirect parameter assignments in cycles with
numbers greater than 200 (e.g. Q210 = Q1), any change
in the assigned parameter (e.g. Q1) will have no effect
after the cycle definition. Define the cycle parameter
(e.g. Q210) directly in such cases.
If you define a feed-rate parameter for fixed cycles
greater than 200, then instead of entering a numerical
value you can use soft keys to assign the feed rate
defined in the TOOL CALL block (FAUTO soft key). You
can also use the feed-rate alternatives FMAX (rapid
traverse), FZ (feed per tooth), and FU (feed per rev),
depending on the respective cycle and the function of
the feed-rate parameter.
Note that, after a cycle definition, a change of the
FAUTO feed rate has no effect, because internally the
TNC assigns the feed rate from the TOOL CALL block
when processing the cycle definition.
If you want to delete a block that is part of a cycle, the
TNC asks you whether you want to delete the whole
cycle.
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NOTICE
Fundamentals / Overviews | Introduction
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 10/2017