Sandvik Coromant Heat resistant super alloys - Manual (Page 112)

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CoroMill® Plura CoroMill® 327 CoroMill® 328
Pitch
0.7 – 3 mm
28 – 10 t.p.i.
1 – 4.5 mm
24 – 5 t.p.i.
1.5 – 6 mm
16 – 4 t.p.i.
Cutter dia (Dc), mm 3.2 – 19 11.7 – 21.7 39 – 80
Thread milling
Many holes in a typical aerospace engine casing require threads.
Machining the thread in smaller holes can prove to be a difficult
operation. This can be performed using a tap to machine the
thread. However in HRSA materials this can cause problems with
chip jamming resulting in tap breakage and ultimately scrapping of
an expensive component.
The main options for thread milling using Sandvik Coromant tools
are single-point threading with CoroMill 327 and CoroMill 328, and
multi-point threading with CoroMill® Plura.
All tools produce different threads of the same pitch with one tool.
Single-point threading
CoroMill®327
Designed for holes over 12 mm, CoroMill 327 offers inserts for
metric, UN and Whitworth threads.
The front-mounted inserts are positioned in grooves for secure
mounting, and through-tool coolant aids chip evacuation, giving
secure and continuous performance. CoroMill 327 is available in
versatile grade GC1025, for all material types.
CoroMill 327 has Weldon shanks, steel or solid carbide.
∅ 3,2 ∅ 39 ∅ 11.7