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30mm (1.2 inches) bar turned down to 26 mm
Machined length: 145 mm (5.7 inches) no tailstock
I’ve used these Iscar inserts: Roughing: CNMX 120708 Grade: IC 907 Cutting speed: ~ 70 m/min, feedrate: 0.3 mm/revolution, Cutting depth: 1st cut 1.5 mm, 2nd cut 0.5 mm
Finishing: TNMG 160404 TF Grade: IC907 Cutting speed: ~ 50 m/min, feedrate: 0.12 mm/revolution Cutting depth: ~ 0.1 mm

Machining Vitalium Material: 12.7 mm (1/2 inch) bar. Machined length (using tailstock): 155 mm (6 inches)
Inserts used: Roughing: Iscar VNMG 160408 TF Grade: IC907
Semi Finishing: TNMG 160404 TF Grade: IC907
Finishing: VNMG 12T304 NF Grade: IC 907 Cutting speed: ~35 m/min

This material can give you some trouble getting a decent surface finish, especially when facing off.
I’ve used these Iscar inserts: Roughing: WNMG 080408 VL Grade: IC907
Semi Finishing: TNMG 160404 TF Grade: IC907
Finishing: WNMG 06T304 SF Grade: IC530N
The SF chipformer of the finishing tool gives you a really good surface finish. I left about 0.07 mm(0.0028 inches) for the finishing cut.

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