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

Green machinist · Jan 13, 2019

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.

Larry Dickman · Jan 14, 2019

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

gustafson · Jan 14, 2019

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

Green machinist · Jan 14, 2019

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

gustafson · Jan 14, 2019

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

Newman109 · Jan 14, 2019

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 .

Green machinist · Jan 14, 2019

gustafson said:
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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BP boss cnc ball screw backlash. How much is too much?

Green machinist

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Larry Dickman

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gustafson

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Green machinist

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gustafson

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Newman109

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Green machinist

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