Hard (Turning)Times

[magicniner]

I've finally gotten around to fitting the ball screws to my small simple test CNC mill conversion, the ball screws were bough here second hand but pretty much unused and were a "close but no cigar" match to my mill so yesterday I slung them in the lathe to adjust the end dimensions to fit.
The cuts on the X axis screw were within the annealed areas but for the Y axis screw I needed to go into the hard section and didn't fancy hitting it with a blow torch and wet rag, so, after trying a couple of styles of carbide insert I remembered I had a box of CBN hard turning inserts, I stuck one in a holder and all I can say is "Knife through Butter".



The shiny bit is the Hard Turning, the rest was already done when I got the screws.