Re: [CAD_CAM_EDM_DRO] re:Final leadscrew design - thanks to all (not yet?!?!)

In a message dated 10/26/00 7:02:09 PM Hawaiian Standard Time,
currinh@... writes:

<<
So, if the bearings are "face ground angular contact pair" they are
made to be correctly pre-loaded when forced face to face? i.e. no
slop. How about the "double row ball bearings" or "double row angular
contact bearings". Are these built with a pre-load so there is no slop
or simply to take more load than a single row? I looked at the SKF site
a little but couldn't determine if this were the case. (Well, I didn't spend
a lot of time looking. :-) ).

Thanks.

Hugh >>
The face ground units can be bought with various levels of preload. Double
row ball bearings usually have no preload, just a close fit. Same with double
row angular contact. They use these on Dunham air collet closers. They do
have slop. End play specs ae rarely listed for non thrust duty bearings.

Peter
THRD, Inc.