BP boss cnc ball screw backlash. How much is too much?
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  1. #1
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    Default BP boss cnc ball screw backlash. How much is too much?

    I got my first ever machine. Im converting it to a electromechanical manual mill for now with 3 manual pulse generators and three DQ860MA drivers. Later mach 3 or 4 is calling my name.
    How much backlash is normal for this cnc ballscrew on x and y. Im seeing about 0.002-0.003" on the built in gauges before my dial indicator moves on the table. Any sugestions? Adjustment procedures if there is one.

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    No backlash is normal. You can tighten them up a bit by putting new balls in them. Or send them out to be rebuilt. There is no adjustment

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    Check if it is the thrust bearings. I redid a boss some years back and the thrust bearings were the source of backlash there

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    This is what I was thinking too.
    how do I check the thrust bearings?
    What is the part number for the thrust bearing?

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    They are expensive bearings but cheaper than a ballscrew, I would replace them and see where your backlash sits

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    My 1987 Taiwanese Webb mill was originally a CNC conversion at the point of sale, so it came to me with ball screws. The Y Axis has zero backlash and the X Axis has .007 which is no problem for manual use with a DRO.

    I agree with those who mentioned checking thrust bearrings since movement of the ball screw on its axis will transfer into lash .

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    Quote Originally Posted by gustafson View Post
    They are expensive bearings but cheaper than a ballscrew, I would replace them and see where your backlash sits
    Do you know what the part numbers are and how to check the thrust bearing


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