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