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  • Orrery- A Mechanical Solar System Model from Plywood

    Hello! I want to make mine out of aluminum on my CNC mill and I just sat down to start cading this up. Came to a screeching halt when Gear Generator asked me about Pitch diameter, Diametral pitch, and Pressure Angle. Mind if I ask what values did you use? Also, what size cutting tool did you use when you cut out your gears? I've been reading instructables for years, but this is the first time I ever sat down to actually try to implement what I read. Thanks!- Steve

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