That is, unless you’ve got the proper tool. We figure [Machine Mechanic] must need to cut a lot of them ... you’d need a four-axis CNC to pull off. Lathes seem at first like rather single ...

I’m using my 3D-printed tool post indicator ... If they are different, the machine is cutting a taper, which means your bed has some twist. Adjust or shim the lathe’s tailstock-end feet ...