new Z: killed the counterweight

A project log for Minamil 2dc: a minimal CNC mill

Each axis: ̶$̶5̶ ̶$̶8̶ $10 motor+lead screw, 3x LM6UU, 3x 6mm x 100mm rod, 1/8in hardboard, PC case screws

paul-mcclayPaul McClay 01/18/2023 at 05:112 Comments

Nearly half a year since first log about dumping the Z counterweight, maybe increasing stiffness, and further reducing cost, here's the goods: Instructable; CAD.

This Z axis has hit the same micron (±0.8μm) more than 200 times in a row over most of an hour of Z probes in a "Minamil" rig (this project). Practical repeatability appears to be within 25μm (0.001") after warm-up. In other words, it can resolve micron-scale dimensional creep as stepper heat spreads through a structure.

So how did that take half a year?

Someone at Instructables apparently liked the 'ible enough to send it straight to the home page:


TOMMYW1974 wrote 01/19/2023 at 18:18 point

...and here too! You're everywhere. Great work 👏 

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Paul McClay wrote 01/21/2023 at 12:07 point

Mostly here, really. With some Instructables over there because I haven't made peace with the "Instructions" format here. :-/

Glad you like some of this stuff. Make one for yourself?

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