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

Take a look at Wholesale Tool #1990-0015 . This is a 6" horizontal/vertical
turntable with a 90:1 reduction. I bought one and attached a 23 frame 130oz
stepper. I can only say it has turned out one of the better buys I have
made. Price is $99.00 plus freight. It really is accurate to 1 min of arc.
It is ground and hand finished nicely. I don't know it metallurgy but it
looks like someone cared.
Paul

----- Original Message -----
From: "turbulatordude" <davemucha@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, June 04, 2003 11:00 AM
Subject: [CAD_CAM_EDM_DRO] Re: Building a small 4th axis


> 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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