All items created are .015" too small

[Aiph5u (Aiph5u (not affiliated with Onefinity))]

Hey Bill @Machinist, hey Bill @bwcherry,

@Machinist

one thing I would check would be the nuts at the ends of the ball screws. Make sure they are drawn up snug, but not too tight as to create undue axial load on the bearings. But enough to ensure there’s no axial slop.

the manufacturer has this description:

@OnefinityCNC

7) End Nut Adjustment

Ensure the nut on the rail end is properly tight. Too tight and the ball screw will not move, too loose, and the ball screw will not spin when the motor spins. There is a washer behind the nut. Proper tightness is when the washer behind the nut can just barely spin freely. Adjustments should be made in ¼ turns.

Foot Pound Torque Setting is around 4 lbf⋅ft ≈ 5.4 Nm

But wouldn’t play here have been noticed in the test on ball screw backlash?

By the way @bwcherry, while you’re at it, have you checked that the ball screw coupler is not loose?