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README.md

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    Short (50mm)_z axis.

    Below is a short z-axis integrated into the xy machine. The z axis has about 50mm travel. Next, demonstrate wax cutting and PCB milling with this configuration, as well as measuring z-axis resolution and hysteresis.



    String up and measure z-axis alone. First horizontal, with fishing line as belt. Necessary to adjust bearing position to ease friction on z-travel. Once that feels good, the plot below is obtained, moving in increments of 32*(1/32) steps eight times forward, then reversing. Each full step is calculated, using the radius of the capstan, to be 0.31 mm. Hysteresis is about 0.05 mm.


    Now do the same with axis held vertically. Result below. Looks like hysteresis is now about 0.13 mm.

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