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

Hello,

Somebody added to the spindle thread I mentioned, and CNCZone sent me
an email... So here's that thread I mentioned:

http://www.cnczone.com/forums/showthread.php?
s=&threadid=3001&perpage=15&pagenumber=1

Hope this helps,

Ballendo

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "ballendo" <ballendo@y...>
wrote:

> 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