Re: [CAD_CAM_EDM_DRO] Re: tensioned ballscrew

"Spin the Nut" works really, Really nice when you have the "hollow" motors.
When you have to build a substantial "mechanism" to spin the nut via a belt
drive and have it all run on a good bearing, this gets a little (just a
little) more challenging. If you have any drawings you'd like to share, I'd
be interested. I tinkered with the concept briefly and found the need for a
larger diameter (specialty) bearing to encapsulate the nut system and hold a
toothed pulley. Of course, I wanted to use the off the shelf type anti
backlash stuff so when it goes sour, you can just replace it.

Then too, I found the whole unit took up more space than I wanted to use on
my machine. But, it can be done..... And then you do not have Shaft "wobble"
at higher RPM.

Chris L

ballendo wrote:

> Doug,
>
> Sounds like a lot of work, especially when there's a simple, proven,
> often-used solution.
>
> Spin the nut.
>
> You can still "adjustably" tension the screw if you want...
>
> Hope this helps.
>
> Ballendo
>
> P.S. K.I.S.S.
>
> --- In CAD_CAM_EDM_DRO@y..., "Doug Harrison" <prototype@c...> wrote:
> > I have two ideas that need to be challenged. The screws on the X
> axis of my
> > router are ten feet long. They are 1" diameter, .25 pitch from
> Rockford.
> >
> > 1. We have come up with a way to provide intermediate support so
> as to get
> > around critical frequency problems. An extra pair of blocks on
> each linear
> > rail will carry support bushings. These blocks <snip>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> Post messages: CAD_CAM_EDM_DRO@yahoogroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Manager
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/