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

Les,

You lost me. It IS a 3 bearing design. Or is the face ground AC
bearing set considered "one" bearing?

This design has been used successfully on many commercial spindles
for years. If by three bearing you mean the ground faced set, another
bearing spaced from them, and then the third radial bearing for the
pulley end; I agree. That design is MUCH stiffer. AND MUCH more
expensive. Also requires a GREAT deal more precision in the making...

The design finally arrived at, is sold by some well known mfr's as a
separate spindle to "bolt-on" to industrial process machinery. I'd
certainly trust it for use in a small mill or as a bolt-on for a
gantry machine. I wouldn't use cat40 on it...

Ballendo

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

> There are some nice drawings in this thread.
> I do not consider this thermally stable however.
> As the shaft warms up preload would quickly be lost
> in the DB configuration unless the housing or shaft
> were very flexible axially. The required flexibilty
> would result in a spindle that has pretty poor
> axial stiffness.
>
> A three bearing system would work better.
> I understand that there were some limitations
> imposed on this design by being constrained to
> a mill drill head.
>
> 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: ballendo [mailto:ballendo@y...]
> Sent: Monday, April 19, 2004 1:32 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: 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&pag

> enumber=1
>
> Hope this helps,
>
> Ballendo