Re: [CAD_CAM_EDM_DRO] Re: fitting ballscrew ends

Hi Les:
I'm sorry; I completely misunderstood your intention.
I thought you were planning to make and sell these to hobbyists and others
wishing to homebuild.
If your intention is to provide a method that THEY can use in lieu of
machining the ballscrew ends, then this is certainly a workable way.
Cheers

Marcus

----- Original Message -----
From: "Leslie Watts" <leswatts@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, June 11, 2005 7:31 AM
Subject: RE: [CAD_CAM_EDM_DRO] Re: fitting ballscrew ends


> Marcus,
>
> I think the cnc hobbyist would be reluctant to pay even $50/end for
> end machining of his surplus ballscrews. That's $300 for an xyz
> machine.(feel free to correct me on that :) )
>
> So he would want a way to make his own accurate ends on a
> HF mini lathe or something.
>
> He could have the enjoyment of turning these end caps
> in his own shop.
>
> As far as holding the balls in place...I mentioned a dab
> of glue...but a simple loosly fitting split ring with 6 holes
> might do as well. Like a ball retainer in a bearing.
>
> I can't see any way around pinning. Set screws perhaps... but
> that would be questionable. As long as the case is hand ground
> off in a couple areas where the hole is drilled it wouldn't seem
> to be hard. Heck...I often drill taper pin holes with a hand drill.
> It doesn't have to be centered or anything...just there.
>
> The epoxy is problematic due to shinkage. It must bear shear
> and bending loads...the balls are just for alignment.
> They would quickly brinnel if they carried a load.
>
> BUT...if the epoxy were slow cured in a cold environment (0-5c)
> it would swell back enough (.005 mm or so) on warming to at least
> be line to line.
>
> BTW last time in Chicago I saw a big ballscrew grinder in one
> of our division's bone yards. 36" segmented wheel. Custom machine.
> One of my colleagues designed it. Bet it's scrap iron now!
>
> Les
>
> Leslie M.Watts
> L M Watts Furniture
> Tiger Georgia
> (706) 212-0242
>
> Main page:
> http://www.lmwatts.com
> Engineering:
> http://www.lmwatts.com/shop.html
> Cnc surplus for sale:
> http://www.lmwatts.com/forsale.html
> Carved signs:
> http://www.lmwatts.com/signwp.html
>
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com]On Behalf Of Marcus and Eva
> Sent: Saturday, June 11, 2005 1:19 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Re: fitting ballscrew ends
>
>
> Hi Les:
> I like this idea much better; it's certainly much easier to do for the
> price point you're talking about.
> Probably better concentricity too.
> The hardest part will be getting the balls to stay where they're supposed
to
> as you slip the stub shaft over the end of the screw.
>
>
>
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