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

This pretty well describes the CNCZone spindle I just posted about...

But It also has details of the drawbar and retaining balls, for QC
tooling...

Hope this helps,

Ballendo

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Leslie M. Watts"
<leswatts@a...> wrote:

> 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@r...]
> 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