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« on: October 08, 2009, 03:52:51 AM »
Unless I am missing something major in your explanation, I don't think this is going to work. Here's why. The motor will determine the shaft speed of the shaft on the left and the speed of the right shaft will be determined by the speed of the left shaft and the gear ratio. So hypothetically if the left shaft were traveling at 1000 rpm, the right shaft will want to spin at the following speeds based on the three gear ratios you have shown:
12:16, 750 rpm
14:14, 1000 rpm
16:12, 1333 rpm
Since all three sets of gears have chains connecting them they are all trying to drive the right shaft at the different speeds, which means there will be no movement at all, until two of the chains snap or one of the shafts break. Chances are the motor doesn't have enough torque to cause either of those to happen so you'll just burn up the motor. You need a way for the other two gear sets to slip while the one is active.
