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Crank mechansm . When you turn one end either way the other end always turns clockwise - could be used for example in a pendulum clock. . This device is built in two separate parts, and each sort of functions without the other. Originally there was just a bottom half, and I didn't originally intend to build a top half bacause I seemed complete. But with the two tegether it is definitely better. What the bottom half did was that when the lever was turned anticlockwise (counterclockwise), the output gear turned anticlockwise. However, when the lever was turned clockwise, the output gear didn't move. Thus if the lever happened to be a pendulum the output gear would turn every 1/2 oscillation, and always anticlockwise. With the top half added it ensured that it wasn't stationary when the input was clockwise - it went anticlockwise whichever way the lever turned (every 1/4 pendulum oscillation). I'll explain the whole lot below. NOTE: When the input turns anticlockwise, the output turns in the opposite direction. However, in the description above I said the output went anticlockwise. This is because that's when you look at it from the opposite end. Looking from the input end, with the lever, the output actually goes clockwise. But looking at it from that end, you can't actually see the output turning, so you turn it round and it looks like it's going clockwise. You know, like right becomes left when you look the other way.

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