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the 240 volt motor has been running.for several.years now with no problems so the answer is yes a 240 volt squirrel cage motor will run on 120 volts -at least in a fan application.
make sure the motor is squirrel cage motor. It should not have a capacitor on the side or contacts inside the end of the motor on the end opposite the shaft. If that is alright just hook the 120 volts to the red and black wires. Ground wire to the frame. Cap the neutral white since you won't need it. Remember I only tested this on a fan and it used less current than it did on 240 volts. On a machine with a varying or heavy load the results may be different. Something like a small saw or lathe should work fine.
I gave it a shot and got it to work with a perpendicular crank. It did not work until I figured out that the two cranks had to be exactly alike. Also the length of the connecting link between the two is pretty critical.
The easiest way I see to do that would be to take the up and down action of the original crank and use it to turn a second crank that is turned 90 degrees perpendicular to the original crank.
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