Re: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC INFO

Doug,
Somewhere, in my material handling experience, I ran across a vendor
that makes just such large-diameter screws for raising and lowering rather
heavy loads, and it seems to me that they were similar in type to a ball
screw. I'll try to resurrect the information.

Marv Frankel
Los Angeles

----- Original Message -----
From: "Doug Fortune" <pentam@...>
To: <cad_cam_edm_dro@yahoogroups.com>
Sent: Sunday, January 19, 2003 8:53 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC INFO


> "turbulatordude " wrote:
> >
> > Although more expensive, I thought about a rotary table style screw
> > for the Z. the large, screw would spin thereby raisisng the table.
> > I think the sizzors is too fragile. The lifting members have to
> > undergo tortonal stress, compression and expansion.
> >
>
> Very interesting... using a large diameter screw (say 12" dia) as a
> base allows you to not only raise and lower an XY table, but also
> act as a rotary table.
>
> Incorporating yet another (opposite handed) large dia motor driven screw,
> allows the table to rise without rotary motion of the upper XY table, or
> all kinds of combinations if the two motors were independent.
>
> This likely wouldn't be too fast in Z, but it would be very rigid.
>
> Another option is a mini-hexapod bolted to the table. This of
> course would give 5 axis CNC, but whether it could be made rigid
> and small enough is an issue.
>
> Doug Fortune
> http://www.cncKITS.com
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