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The tools excel due to the high process
reliability they provide and their reduced
cutting force. Ultimately, Siemens staff
needed to convince themselves of the quality
of the threaded bores for screw insertion on
the surfaces of the different casing parts and
the fronts of the casings. This is a challenging
machining task. "The situation back then
was that if any machining errors occurred
during the thread tapping of a large casing,
it was very difficult or even impossible for
us to carry out repairs because there is too
little material in these areas to insert a bush,"
summarised Markus Zapke, head of Tooling,
Equipment and Processes of Siemens
Gasturbinenwerk, Berlin. The first alternative
to be tried was thread whirling, however,
this proved to be extremely time-intensive.
Three years ago, Michael Bender, the Power
Generation industry specialist at ISCAR, was
able to transfer the thread milling technology

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