[DaveW]

Mike,
The lathe rpm is set to 925rpm and the stock was 3/4".
The tool tip is a 7deg relief, the pack has "non ferrous" on the label, i have a heap of "Ferrous" labelled tips as well, with a 4deg relief. (obviously for steel stock)
so this combination suits the 6061 stock i'm using.
I dont usually change the speed for diameter, but i probably should
My newer lathe is sitting on 625rpm, maybe need to speed this up for aluminuim.
What do you use ?
Dave