Re: CNC on a lathe

--- In CAD_CAM_EDM_DRO@y..., "John" <johnhe-uk@s...> wrote:

> Rotating tool bits? That's a new one on me at the moment. I can see

the

> sense behind it but I've not seen one that can actually do that

available to

> the hobbyist. My CNC lathe cuts spheres and tapers with the tool

constantly

> in the same position.

Sorry - I should have referred to why I thought this was the case. I
found this on another machining group:

http://groups.yahoo.com/group/home_machinist/files/Spherical_Turning_T
ool.pdf

In his design, the tool is rotated on a yoke. Its a relatively
simple concept actually so I figured that all radius/sphere turning
tools were like this. You can see in his document that he is making
som sphere tipped shafts. So, suppose that you want to cut a shaft
that tapers down toward the end and then at the end you have a
spherical end and not just a half sphere but more like 75% of a
sphere (like what is shown in the above document). Now, your tool
bit has to be able to cut on both sides if you were to do this
without changing the setup. So what kind of tool would you use if
the tool isn't rotating - a cutoff blade? What I find interesting is
that the fundamental approach may have to be different if using CNC
versus manual. Of course, I may be off my proverbial rocker, too.

-Chris