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normal range of threads very well." Currently five
milling heads of different dimensions and diameters
are in use at the Siemens gas turbine plant in Berlin.

The various thread sizes make it necessary to use
suitable take-ups with different protrusion lengths.

According to Bender, if the tool take-up diameters
are optimally harmonized with the diameters of the
milling cutter bodies then the result is the greatest
possible stability and vibration-free machining. The
employed inserts are standard products with a
variety of pitches and can be replaced in a matter
of seconds. "Another important consideration is
that, thanks to the optimization and restructuring of
the production sequence, from the boring machine
through to the PowerTurn, an entire component
clamping operation can be omitted during the
machining of the flanged threaded bores at the
fronts of the casings," stresses Reich. "Instead of
half the operation being performed at the boring
machine, it is now performed upright at the vertical
machining center," he continues. Thanks to the use
of the ISCAR milling cutter, it has therefore been
possible to fully optimize this production step.

As part of another technology transfer, this time at
the Siemens steam turbine manufacturing facility in
Görlitz, the introduction of the MILLTHREAD thread
milling system has once again made significant
savings possible. "In one current application, it
has been possible to perform the machining of 62
M90x6 threaded bores for screw insertion, each
with a thread depth of 96 mm, at the surface of a
steam turbine casing part three times faster than
before," adds Bender. Reich summarizes as follows:
"The ISCAR system is now an accepted part of
everyday work at the Berlin plant."

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