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Mount Gearbox Ratio Calculator
Exotic mounts has the RA and DEC axis as a part of the motor and then there is no need of gearboxes. But what is normal is to use a worm gear, gear box or belt drive, often in combination. There are also friction wheels that act as a gearbox. Harmonic drive is very interesting because of its lack of backlash.
More to read about worm drive, gearbox and belt drive at Wikipedia:
With this calculator you find your total gear ratios from different setup of gear boxes. You also find the angular resolution per micro step of stepper motor or tick from your DC motor encounter.
Type in your data
It start to calculate as soon you change or write new figures in the white or dark red boxes. Do not exceed the maximum number of characters, delete characters if necessary.
In my dream mount I have a worm gear of 435:1 and then a direct connected DC motor with a high resolution position sensor (encounter). But it will not be an easy project, my experience from the industry is that direct drive DC motors are sensitive and easily come into oscillation.