Re: [CAD_CAM_EDM_DRO] Re: Angular Contact Bearings and Ballscrews question

Hi, Clausing uses a special hollow roller taper bearing at 10 degrees, very
special and price is also! 2 for the spindle, my 9"south bend also has taper
roller bearings....cul brian f.

----- Original Message -----
From: "doug98105" <dougrasmussen@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, June 25, 2002 12:04 AM
Subject: [CAD_CAM_EDM_DRO] Re: Angular Contact Bearings and Ballscrews
question


> Hi Jan,
>
> FWIW, Emco-Maier used tapered roller bearings in the spindles of
> their small production CNC machines. These are 5C sized spindles
> that run at 5 or 6K rpm.
>
> I still have an expensive pair of bearings that I've never gotten
> around to installing. Aside from the removal of the spindle and the
> normal wrenching, it takes quite a bit of time to adjust these using
> the factory method. "run at 300rpm, for 2 hours, check end play and
> temp, if ok, run at 800 rpm for 2 hours, etc, etc, etc, etc" until
> you get them running at top speed without heat buildup. A tedious
> procedure....
>
> Doug
>
>
>
> --- In CAD_CAM_EDM_DRO@y..., JanRwl@A... wrote:
>
> (snip)
>
> > The only machine I can recall that had tapered roller-bearings
> (aside from
> > "car parts") was an OLD Atlas lathe. Some folks "love" those, but
> they were
> > kinda obsolete! I have NO clue if "tapered" is right for any new
> lathes,
> > etc. Just no idea. But for high-RPM use, the dual-row angular-
> contact is
> > right! Yep! Scho' nuff!
> >
> > Jan Rowland
>
>
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