We got two axis working and nearly calibrating (rotation and x), a gear bearing replaced, and software humming along and communicating with iMac. We finally were able to build upward from our plastic foundation. The extruder and all z axis stuff will be suspended from a framework of 1/16″ aluminum angle stock – and it’s 3/4″ off the floor so the bottom electronics aren’t dragging anymore.
In order to make mathematical forms – or any forms, the two axis must numerically correlate together. So the number of motor steps to make one full table revolution will be related to the number of steps needed to move the table linearly from “min” to “max” (about 7″). We use opto-endstops to sense the limits. The best tab to block the opto endstop (and signal a min,max, or full table rotation) was a foil strip from a teabag packet. Great tea too.