Achievable milling and Sink EDM profile tolerances
I am designing a component where there is an inner form constructed from a radius that is offset from the centreline. As such, the profile is not a true hemisphere, but two half-hemispheres with a flat in the middle.
I believe this means that using a lathe is out, and so the options will be to either spark erode it using a graphite probe, or to mill it using a fine ball nose to finish machine it.
As such I am trying to understand realistically achievable and best case achievable tolerances for a 3D surface profile such that I can produce a drawing for it.
Having considered the worst case application, I need to be aiming for a 3D surface profile tolerance of 0.060mm maximum. Gut feeling says this is tight but can be done, but then again I'm not experience in the programming or machining of it.
Can anyone with experience share their thoughts? Am I on track, or way out?
Comments and criticisms gratefully received.
Cheers
Preo.