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After days of considering a 100 ways to drive the dome, ive decided to 3d print a circular rack afterall, because i know it will work. Custom made racks are crazy expensive.. To design this I thought would be a nightmare, but no, to my surprise a free plug in for fusion360 called Helical gear plus (also does straight) is super easy. Enter diameter, number of teeth, teeth pitch and your done. Ill split it up into printable segments and add mounting holes. The gear to match is easy. The attached pic shows a list of steps that were just me just mucking around with parameters. I have bought and tested a bunch of 12v geared motors off ebay at $24ea that albiet are small, but strong and robust (al case and brass gears), and given the price ill use 2 or 4 or them (or more) round the dome in parrellel. Less stress on the ABS rack that way too.
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