I have some slots/holes (typically 2....3mm wide) to do pretty accurately in a number of pieces of 80% nickel sheet, so the CNC's the obvious go-to. I was told by the supplier that it's a bastard to work with, does anyone have any experience of this please? I'm guessing it will be a bit like stainless & work harden rapidly hence you need to press on mercilessly, but if anyone has any info on speed & feed I'd be very grateful, thanks.