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This section contains questions and topics related to troubleshooting BoXZY's CNC milling head.

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Would wider linear bearings increase accuracy (less wiggle)?

I've been staring at my boxzy and I know that under zero loading (with the laser or printer) the linear rods should provide smooth motion. This is without taking any potential bends in ball screw rods. I'd expect that when milling, however, that there will be some amount of wiggle with the linear rods, as I can easily deflect it with my hands and little pressure. This leads me to my potential improvement: wider linear bearings. Short of finding actual wider bearings, 2 side by side of the current size but secured in a wider block would also work. I looked at the amount of room left in the x and y directions, and there appears to be enough of a gap between the current bearing and the rest of the machine to allow for this.

For the Z direction, a bearing like this would be ideal:

http://www.pbclinear.com/JPKC-Square-Fla...

I have noticed inconsistency with the z axis in regards to repeatable motion. I have a depth gauge that I attach to the carriage with a clamp, and then I move the print bed up and down over and over in the same location the same distance and I have seen around +/- 0.01" which seems high for a unit with ball screws. I took the measurements from beyond the z limit switch to remove that as a variable.

Anyways, if anyone has any thoughts feel free to weigh in!

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1 Answer

My guess would be that what was gained from longer bearings would be again lost due to increased resistance and vibration. However, I'd love to see what happens.

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Drunken Boxzer will be eternally grateful.
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