I'm working on 3d printing a planetary gear for LEGO. I've got a constrained set of planetary + sun gears and was looking into designing a custom ring gear.
I've read a little bit into the design of gears but am currently confused. This is what I've found.
Sun gear: 20 teeth, OD=21.3mm Planet gear: 12 teeth, OD=13.38mm
In both cases, module (m) = 1 (for the gears to mesh the module has to be the same?)
Pressure angle = 20 degrees.
I was just wondering how I would go about designing such a ring gear in CAD, i.e. figuring out the number of teeth, tooth size, height etc. Thanks in Advance.