APT High speed, high hardness end mills - anyone used them?

[m_c]

What style of locking wheel nut?

The biggest issue with stainless, is you need to be continually cutting. The moment your cutter rubs, it'll work harden, and then you need a lot more power and DOC to get through the hardened bit.
You can machine 304 with HSS, it's just carbide and coatings last longer.

[Voicecoil]

They're the 4 pin style, like the cursed Peugot things, with a centre boss that's designed to shear off if you try welding anything onto it Thanks for reminding me about the quirk of stainless, I learned that a few years ago when making an underwater camera mount for one of the Springwatch guys: yeah once you start you just have to keep going 'til you're through, no job for the fainthearted ... which was one reason I want to get a decent strategy planned before I press CYCLE START.