Cutting a curved shape from a block of aluminum

[Jonathan]

RE: Jonathan

Yes I forgot to mention he would need a ball nose tool with radius less than 5 17/32.

or equal to! But more seriously, that's not the point I was making - your code will be more accurate as the tool diameter tends to zero, so clearly you need to compensate the tool height as in my diagram.

I'm not sure that the code Jazz has linked to does this either?