Re: Acme / Ball Screw conversion

Thanks Bruce:

My current Y-axis screw has "angular contact" end bearings.

I've never really known the advantages one type bearing has over the
other in this type application, as long as they have some sort of
thrust characteristics.

This is "Angular Contact", you mention "Roller thrust" and "Ball
thrust", and someone just a few posts ago was talking of a "Deep
Groove" (I believe).

I suppose if the bearing meets size, load, and precision
requirements, that the type of bearing is secondary.

The Load specification alludes me, I would probably just pick the
largest that fits.

Tom M.

--- In CAD_CAM_EDM_DRO@y..., "brucegriffing" <bgriffing@c...> wrote:
> Don't forget that table backlash in a mill can have two sources -
one
> is the drive screw/nut combination. The other is the thrust
> bearings at one end of the drive screw. If they are ball or roller
> thrust bearings, there is usually no trouble tightening them up to
> eliminate backlash. But many inexpensive mills use plain bearings
> that cannot be tightened enough to eliminate backlash without
locking
> up. If you face the plain bearing problem - you may be able to
> retrofit roller or ball thrust bearings thereby dramatically
> improving your mill.
>
> Good luck - Bruce Griffing