Sandvik Coromant Silent tools - application guide - Manual (Page 80)

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4. Boring
Application examples
Case one: Lug holes, landing gear
Machining of an aerospace part, with a length of 2.1 m (7 ft) and
width of 0.91 m (3 ft) was an accessibility challenge. The com-
ponent has two lug holes in line on the outside and the process
consisted of semi-roughing both lugs from one side. Then followed
a finish pass and a ream pass of one lug hole from one side,
followed by a set-up of the part to the opposite side, dialing it in to
centre, completing with a new finish- and ream pass.
The Sandvik Coromant solution was to combine finishing and
reaming operations and use a Silent Tool to bore both lug holes in
one operation. This improved the process by eliminating the set-up
time to move the part and dial in. All machining was performed
from one side and the reaming operation was eliminated.
As shown in the data below, both cutting speed and feed could be
increased and after nine manufactured components, the return
on investment was achieved! A staggering productivity increase of
228% for the complete component.