Re: [CAD_CAM_EDM_DRO]Screw drive

Tony,
just want to clarify that IMO thrust, axial bearings should be ball-type,
and radial, inside of the threaded rods, can be replaced by bushings.
Alex

----- Original Message -----
From: Tony Jeffree <tony@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, March 29, 2003 12:48 PM
Subject: Re: [CAD_CAM_EDM_DRO]Screw drive


> At 15:51 29/03/2003 +0000, you wrote:
> >I too am perplexed at what the thing looks like, but I guess that the
> >three screws are set so the heads act like threads in the larger
> >leadscrew.
> >
> >Since I didn't see any reference to bearings, the unit would wear
> >quickly.
> >
> >Dave
>
> Dave -
>
> Its hard to visualize without a diagram or pic, so take a look at this:
>
>
http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/Tony%27s%20files/screw%2
0drive.JPG
>
> There are three short lengths of threaded rod (they don't have heads!)
> arranged in a triangle around the leadscrew. Each of the short rods run in
> needle roller bearings & have thrust bearings at each end (as Alex has
> indicated, the latter could possibly be plain bushings, although the
> article talks of using cheap plastic caged ball races). The top screw is
> adjustable to take out any slack between the leadscrew & the "screw nut".
>
>
> Regards,
> Tony
>
>
>
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