I'm doing an X3 conversion and have a question on angular contact bearings. I got the bearing pictured below (INA 3200 series). this is a double row angular contact that is is to absorb axial loads in BOTH directions. Now, I must be having a bad day, because I'm confused as to how to pre-load this. If I was using two single row units back to back, I could see pre-loading it by squeezing the two inner races (would need a small space between them) then capture the outer race in the bore. In fact some of the larger double row units I've seen have two separate inner races. So does that mean these do not need to be pre-loaded? I've searched the manufacturers web site for tech info, but couldn't find it. These were "cheap" at $27 each, and I got them thinking I would only need one on one end of the screw. But I think I'd be better off with two single row units, one on each end of the screw, so I could completely remove any slop in the bearings.
Rubes
so thats how I end up with so much stuff...always doing things twice!!!