Cutting a curved shape from a block of aluminum

[Rufe0]

Hey!! Think you'll have to explain that one to me.? Only way that code would cut concave is if machine was upside down . . . But like you say to get it concave is easy fix but still not correct because like Jon points out there's no tool height Comp.

Ah I think I've figured out the confusion, in mach 3 it's convex but I was using quick and dirty toolpath simulator. Tried it in a couple other simulators I had when you questioned it and they where all concave. I think it's the G18 XZ axis designation, in Mach3 the CW/CCW circular interpolation is in respect to the back elevation whereas everything else it's the front.