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Nice work on the spreadsheet, thanks.
What makes you think that the EQ2 driver will have a stepper motor as opposed to a DC motor? I think it will just have a DC motor set to a given speed.
All the barn door projects I have looked at have the same fixed distance for the arm and thread pitch which result in a 1rpm turning of the worm gear giving the sidereal rate. I would like to stick to this if possible as if I cannot get the drive working, I can operate it manually and in that case 1 rpm is easy to operate.
Ideally I could get from the motor rpm to 1rpm just using gears.
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