Re: [CAD_CAM_EDM_DRO] Re: Building a small 4th axis

I think it is a tad on the large side for the mill Graham is planning to
use it with. The Proxxon mills are significantly smaller than the Sherline.

Regards,
Tony

At 15:00 04/06/2003 +0000, you wrote:

>4 inch rotarty table. Harbor freight.
>
>http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=47052
>
>on sale now for $74.99 including shipping.
>
>
>ITEM 47052-2VGA will get it at that price if you "order from printed
>catalogue" on the website.
>
>
>
>
>
>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Graham Stabler" <eexgs@n...>
>wrote:
> >
> > I have been enjoying milling small 3D parts on my Proxxon very much
> > and have been thinking about making a 4th axis for it.
> >
> > I have a 4th axis stepper driver so that is no problem but need a
> > small rotary table. For starters and to learn the process I will
> > probably try milling some foam or wax mounted with double sided on
>a
> > simple plate mounted directly to the stepper motor shaft. I will
> > only have 400 "degrees" resolution but it will get me going.
> >
> > Ultimately I want to build a tiny rotary table possibly still
>without
> > chuck that will give finer angular resolution. I have some Nema17
> > and Nema23 steppers that would seem to suit the task on this tiny
> > mill but no real ideas for the rotary part.
> >
> > My questions:
> >
> > 1. What sort of angular resolution is recommended for general as
>well
> > as perhaps gear cutting processes?
> > 2. How much of an issue is backlash? Can this be avoided by
>rotating
> > in one direction only?
> > 3. Is a simple worm gear ok?
> > 4. Are there any gearboxes already available at a low price that
>will
> > fit the bill?
> >
> > I think that's all I need to know but any tips appreciated.
> >
> > Cheers,
> >
> > Graham
> >
> > p.s. My mill is much more quiet now :)
>
>
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Regards,
Tony