Re: Re: Re: virtual hand jive

Smoke,

I think your question contains your answers!

The ballscrew lead most commonly used is .200(5tpi) or 5mm(nearly the
same). This screw turned by a geared up(electrically or mech.) will
provide the functionality of the rack/pinion. AND driven by 1/2 or
microstepping will ALSO provide the feeds needed. No need for two
screws, IMO.

The hi-end (designed as CNC) lathes do "manual" by wire, as we have
been discussing. Retro-fits will of course, be all over the map,
depending on the bias/ desires of the retro-fitter.

Hope this helps.

Ballendo

P.S. before you get too far into the design of "any" CNC, it
pays,IMO, to check the prices of your "intended" parts. And compare
with some "not-intended" part prices. You will usually find that
some "standard sizes" are a fraction of the cost of others. Not
having anything to do with physically larger/ smaller sizes! 5/8-
.200 is a ballscrew "std. size".

>I could add a gear or two if necessary to use right hand thread
>gears and ball screws and still retain the handwheel rotation
>direction. My machine uses a .125 lead and I see that lead is
>available for ball screws.<snip>