NX-NVD Fraisa end mill machining hardened H-11 at 54 HRC; Full Slots, last pass 2 x's D

[skullmonk3y]

maybe a dumb question... but why no coolant?

[zaknefain100]

@skullmonk3y

No coolant because cutting dry allows the coating to work properly. At high enough temperatures, the coating forms a protective and extremely lubricious layer of oxide. Cooling the tool would lead to rapid temperature fluctuations as the tool is essentially quenched at the end of each cut, which can lead to fracturing and fretting of the cutting edge.

[TechniksUSA]

Very good video in 54 R/c, nice blue chips! We're a bit curious about wall angularity after those cuts: do you get much deflection? What kind of surface finish? Thanks much

[Kizmox]

Incredible performance!

5*