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Low Cost Motor Gearbox Set Simmering Coal Have America's greatest Hero sittingThis unit comes complete with a 3V 12,000 RPM motor . It can be stepped down (with the consequent torque multiplication) up to six times as follows: 12,000 x 12 48 = 3,000RPM 3,000 x 12 48 = 750RPM 187. 5 x 12 48 = 46. 875RPM 750 x 12 48 = 187. 5RPM 46. 875 x 12 48 = 11. 72RPM 11. 72 x 12 48 = 2. 93RPM Clearly, the motor is fitted with a 12 tooth pinion and the small gear cluster is 12 tooth. The large clusters are all 48 tooth. Not all gears need be