Sizing a Ballscrew ( was Re: Price of the ballscrew??

I am looking at the size ball screw that may be needed for a 8 ft x 4
ft table. seems that if routing sheet aluminum and oak were the
expected materials that a pretty hefty screw is needed.

I found the beam deflection file, is there a screw-sizing
calculation ? after it gets so long it will sag under it's own
weight. and if it is too small it will bend when pushed.

What size do any of you use ?

Dave




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "baccus61
<richardmcmahon@o...>" <richardmcmahon@o...> wrote:

> Try www.mcmaster.com
> Scroll down to Power Transmission and look for Ball screws. They
> sell the screws by the inch and also have the prices marked so you
> can get an idea of how much your willing to spend and what you will
> get for it. The ball nuts are resonably prices and you would be
> able to purchase 2 to make an antibacklash nut. I buy alot of stuff
> from them and I live in Australia and find them great to deal with.
> I think it is one of the best sites on the net for browsing.
> Hope this helps.
> Richard.