angular contact bearing friction
angular contact bearing friction
(OP)
Using two 20mm (type 7004) bore angular contact bearings with the intention of securing low torque to rotate and accurate spindle rotation under light loads (ounces rather than pounds) Size is determined by bore required for the application. Bearing has small preload from springs. Result generally satisfactory but torgue as, judged subjectively, is subject to developing slight tightness presumably due to balls not tracking uniformally. Housing and spindle are acurately machined but have not been direcly checked.
Has anyone a view on how the tightness might be eliminated?
Has anyone a view on how the tightness might be eliminated?





RE: angular contact bearing friction
regards
Dave
RE: angular contact bearing friction
RE: angular contact bearing friction
My problem is that, since retirement , I have no access to manufacturures catloges. Have an out of date SKF which gives plenty of general data but nothing on torque values in relation to such things as bearing grade. Am aware of the American grading and also that the cost increases with precision as one would expect. The project is for an experimental device which would not justify the expense of precision grade. Seems I may have to put up with the torque variation. Intend to try altering the preload which presumably has a bearing on torque. Main idea is for the shaft to have minimal run out and maximun radial rigity (axial load is low) when turned at slow spead (say 10 rpm)
noreng10
RE: angular contact bearing friction
By the way, NTN has a cute little program which does imperial and metric computations for you. I highly recommend it, use it quite often for classification of fits.
Good luck with the search.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: angular contact bearing friction
As ceesna1 says a lighter grade of lube might help.
Alternatively if the seals aren't very good you may be getting dust or grit in them, which will have the same effect.
Cheers
Greg Locock