Re: [CAD_CAM_EDM_DRO] Doesnt ANYONE have this drawn up??? was: John's CNC plans???

Jon, you've very much enlightened me on using the existing screw dimensions.
Stupid me... I never thought of that! very cool!

Here we go! :)

Vince

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, August 13, 2003 9:54 PM
Subject: Re: [CAD_CAM_EDM_DRO] Doesnt ANYONE have this drawn up??? was:
John's CNC plans???


>
>
> Vince Negrete wrote:
>
> >I have to repeat this question since I know somebody has info but I'm
> >guessin missed my post:
> >
> >If, anyone else has a good dimensional drawing for an End
> >Bearing/Nut assy, that would work well with a 1.125" 5-tpi Ballscrew
> >installed on a Bridgeport Style Knee-Mill I'd appreciate the info! The
> >idea here is to adapt a proven Concept before I make a mistake
incorrectly
> >cutting the Ballscrews.... (a very expensive mistake)
> >
> >
> If the ballscrew will fit in the original bearings on the right-end
bracket,
> you should be able to use that bracket as is. As for mounting the motor,
> you can make an adaptor that fits into the countersinks in the bracket
> for the socket head screws. One common method is to turn tubes, or even
> buy steel tube with an ID suited for the screws, and an OD to fit the
> countersunk holes. You screw allthread into the holes in the table, slide
> the bracket on, slide the tubes over the allthread, and then mount the
motor
> plate on the allthread. It can have slots, so belt tension can be
adjusted.
> Finally, it is all locked in place with some nuts.
>
> A very similar arrangement can be used on the Y axis.
>
> >If I dont have the Terminology of the end-mount correct maybe this will
help
> >explain what I'm looking for:
> >It mounts on the end of the Ballscrew affixing it to the Mill.
> >Y-Axis should have One preloaded mountpoint typically with one bearing
block
> >assy., and X-Axis should have two bearing block assy's with one side
> >preloaded. Maybe its my use of the word Preloaded that is confusing
> >things.. My
> >terminology might be messed up.
> >
> >The design would determine the cuts needed to modify my Ballscrew ends
for
> >refit onto the Mill.
> >
> >
> If your screws are not yet machined, then just machine them to have the
same
> dimensions as the existing Acme screws, and they certainly will fit the
> existing
> brackets. At least on a "real" Bridgeport, the right-end X bracket, and
> the Y
> bracket have a pair of angular contact bearings preloaded against each
> other.
> (They might actually be deep-groove radial bearings, but they have been
> selected to perform properly in this application.)
>
> Jon
>
>
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