Re: [CAD_CAM_EDM_DRO]spindle plans (was VFD Selection)

Hi Les
If you go to gilman spindles and slides you will see the same setup you are
talking about in there light duty spindle set up. They basically do the same
thing. Also the same principlas are used in all gundrilling splindles.As you
are aware of the tolerences are very critical which i am not sure the
hobbist understand.
Thanks
Todd

----- Original Message -----
From: "Leslie M. Watts" <leswatts@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, April 14, 2004 12:03 PM
Subject: RE: [CAD_CAM_EDM_DRO]spindle plans (was VFD Selection)


> Since it will take me a while (crazy with work) let
> me go over some of the design concepts now.
>
> This is a thermally stable 3 bearing system.
>
> Near the work end of the tool there are two back-to back 25
> degree angular contact bearings adjacent to each other. These
> are supplied with the inner face slightly recessed (only microns)
> such that when they are squeezed together by a retaining nut
> a specific preload occurs (5% of max dynamic load). Further
> tightening of the nut does not increase the preload once the
> faces are forced into contact.
>
> These bearings are press fit on the shaft but a push fit on
> the housing. A shoulder and bolted ring secure the outer
> bearing edge. A shoulder formed on the shaft secures the inner ring, but
> it must be of a very specific size to allow bearing removal by
> pushing on the INNER ring only (with a special tool).
>
> The shaft has a short threaded portion for the retaining nut.
>
> Moving away from the tool end the shaft necks down slightly.
> This facilitates installing the angulars since they won't have
> to be pressed all the way down the shaft.
>
> At the back end there is another reduction in shaft diameter
> to provide a shoulder for press fitting a deep groove ball
> bearing. The outer part of this bearing will be allowed to
> float, but it will be very lightly preloaded with a Bellville
> washer to prevent ball scuffing. It is secured with a retaining
> nut as well.
>
> Thats basically it except for the engineering details.
> Pretty much a standard design that has been used for eons.
>
> Les
>
> Leslie M.Watts
> L M Watts Furniture
> Tiger Georgia USA
> (706) 212-0242
> http://www.lmwatts.com
> Engineering page:
> http://www.lmwatts.com/shop.html
> CNC surplus for sale:
> http://www.lmwatts.com/forsale.html
> CNC carved signs:
> http://www.lmwatts.com/signwp.html
>
>
>
>
> -----Original Message-----
> From: Vince Negrete [mailto:vnegrete@...]
> Sent: Wednesday, April 14, 2004 10:52 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO]spindle plans (was VFD Selection)
>
>
> Les, Would it be possible to have a write-up/drawing on a site in PDF w/
> availability of a full kit?
> I'm primarily interested in design concept with exact specs/demensions to
> follow for building one from Stock.
> So far there are Several folks interested since last nights post.. :)
>
> Vince
>
>
>
>
>
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