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  1. #1
    Join Date
    Apr 2013
    Posts
    25

    Problem with ballscrew?

    Hi,
    I bought two HIWIN balscrews and asked seller to machine ends. I've put the long ballscrew (1,3m / 4 feet) into bearing blocks (BF12) and it is stable only in one position - as if you held banana at two ends (which I guess, means that it is either bent or machining is not concentric).

    Here what's happens when I hand tighten the bearings (2x 7001A - DF cinfiguration). Bearing Block is moving in a circular fashion. When I press it down so that it cant move, ballscrew becomes hard to rotate

    Attachment 283002

    https://www.youtube.com/watch?v=bfo-9KJfJu0

    I know that it's not on a perfectly flat surface - is this the reason for it or it is the ballscrew?

    I've also measured concentricity as shown on the picture below and TIR is around 0,1mm / 0.004" which, I guess, could also mean that bearings are not concentric.

    Attachment 283008

    Any ideas whats wrong?
    And, no I cant put it into gantry yet as i still don't have it :/

    Best regards
    Bart

  2. #2
    Join Date
    Jun 2004
    Posts
    6618

    Re: Problem with ballscrew?

    Particle bard is not a good support. I think once you get it bolted into the machine with the nut secured as well, most of the issues will dissipate. The end run out is probably okay as well. This is why most couplers have some allowance in them for play.
    Install it and then do some checking. My bet is that it will be acceptable. Your biggest concern then might be whip at speed on the screw.
    Lee

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