Thread: BK12 end float?

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  1. That can't be right. The 7000 series bearings are not designed for that much misalignment.

    http://www.skf.com/group/products/be...ent/index.html

  2. #12
    I agree. It doesn't seem right that we have to misalign the bearing to prevent end float. Are these just crappy bearings or am I being thick?

  3. Quote Originally Posted by birchy View Post
    I agree. It doesn't seem right that we have to misalign the bearing to prevent end float. Are these just crappy bearings or am I being thick?
    Is the bearing seat machined square? and spotlessly clean.. no swarf or dirt in there?
    Last edited by irving2008; 19-07-2013 at 12:26 PM.

  4. #14
    Haven't checked squareness of the bore/seat. Will check that tonight. Seats should be pretty clean as I stripped the blocks, cleaned them and greased the bearings.

    Could I be OVER tightening the nut? I'm basically putting a piece of copper tube over the ballscrew shaft end, holding with a pair of pliers and tightening the nut until the pliers slip. Could this have damaged the bearings??

  5. #15
    Problem solved. Couldn't get any preload with the bearings back to back so fitted a 0.2mm shim washer between the bearings to separate the outer races. I was then able to preload the bearings which worked out at finger tight plus about 1/4 of a turn of the lock nut. End float is now less than 0.01mm. Every day day is school day!

  6. #16
    glad to hear that you sorted it out !

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