On 2 November 2011 16:02, Bruce Klawiter <bmkl...@yahoo.com> wrote: > I have read conflicting information on how to install them.
Let me add more then.... > It appears the best way would be installing them back to back, but I have > read the inner rings should be clamped tight and also read the outer rings > should be clamped tight when there back to back. In the case of a matched-pair of bearings then you would want to clamp both, and then the preload would be correct. Assuming that the bearings are fitted to a seat on the ballscrew with a screwed clamp ring, I would clamp the outers together big-side to big-side with a spacer ring between them, then tighten the clamp ring until the preload is right. Which, in my case would be based entirely on guesswork and intuition. If you want a better basis for "right" and you know what the required preload is ( the motor torque and the leadscrew pitch might not be the worst basis) then you can calculate the required clamp-ring torque on the basis of the thread diameter and a friction guess. You can use the equations here (http://euler9.tripod.com/fasteners/preload.html ) with the simplification that you have no collar friction as the inner race you are tightening against is free to rotate. -- atp The idea that there is no such thing as objective truth is, quite simply, wrong. ------------------------------------------------------------------------------ RSA® Conference 2012 Save $700 by Nov 18 Register now! http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
