Ok, i'm trying to determine how to eliminate backlash from the standpoint of the servo or stepper motor. After reading the ballscrew basics a few times, and finding the section on thrust loads, it mentions angular contact bearings as a way to eliminate this thrust backlash that could occur in your driving motor. Which I fully understand and want to eliminate, but after searching for suppliers of angular contact bearings, i'm not finding much that makes sense to me.
mcmaster has angular contact bearings with just look like normal old bearings to me, I understand the whole offset part that if you get 2 then make your own block, but i'd rather buy an assembly already pre-made. So if going through mcmaster, i'm assuming I would buy 2 of these per ball screw and then have to make custom bearing assemblies to hold these properly.
I understand the need to eliminate the thrust load being distributed to my servo motor, and first off, is my comprehension that angular contact bearings are the key? If they are, where is a good supplier of pre-made blocks that would support this. I'm assuming the block would need to attach itself to the ballscrew through some kind of set screw (a series of screws i would assume), but have seen no such setup.
The ballscrew basics post shows one supplier I believe but everything is in millimeters, and www.roton.com (where I was planning on getting ballscrews from) is all in inches of course. Now I know I could roughly translate these, but I attempted that and found nothing that lined up properly. I'm planning on using 3/4" ballscrews for all axises, and need thrust/angular contact bearings inbetween the ballscrew and my servo motors, well, inline with them, as to eliminate any backlash my servo's may cause thrust wise.
Also, on a side note, i've read many good posts about roton's balllscrews, but do people think they are good screws? I'm going with HiWin 15MM linear slides (heavy duty line) for all axis's. I'm planning using roton's ballscrews, but they don't post much for the accuracies of their screws and ballnuts. Their prices please me, but if the quality isn't there i'll have to look elsewhere.
Thanks,
Ross