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

No doubt a great table for a full size mill, but that 6" table probably
weighs more than the entire Proxxon mill that Graham is trying to use.
These mills are *small*. I think that is probably one of the reasons he
plans to build his own (tiny) rotary table.

Regards,
Tony

At 12:32 04/06/2003 -0400, you wrote:

>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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> >
> > OFF Topic POSTS: General Machining
> > If you wish to post on unlimited OT subjects goto:
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> >
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> > List Mom
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>Addresses:
>FAQ: http://www.ktmarketing.com/faq.html
>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
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>
>OFF Topic POSTS: General Machining
>If you wish to post on unlimited OT subjects
>goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to
>reach it if you have trouble.
>http://www.metalworking.com/news_servers.html
>
>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
>sister site to the CCED group, as many of the same members are there, for
>OT subjects, that are not allowed on the CCED list.
>
>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING
>THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
>bill
>List Mom
>List Owner
>
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

Regards,
Tony