Home › Forums › General Discussion Forum › How do you put together pendulum cogs from an automatic? › Reply To: How do you put together pendulum cogs from an automatic?
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The two middle wheels that engage the mainspring barrel are called compound gears. Their function is to increase the torque provided by the pinion on the counterweight. The two gears that you refer to as cogs are set so one engages in a clockwise direction and the other in a counter clockwise direction. From your picture it appears that the mainspring barrel needs to move in a clockwise direction to wind the spring. If you ignore or remove the bottom cog from the winding train, there should be five axels from the counterweight pinion to the mainspring barrel. This means that in order for the system to wind properly, the counterweight must move in a clockwise direction in order to move the mainspring barrel in a clockwise direction. This also means that the cog must engage the train in a counterwise direction and spin freely or slip in a clockwise direction. Once this is established, the idler cog can be added in. Because the cogs ratchet in opposite directions, it effectivally adds a sixth gear into the train when the counterweight spins in a counterclockwise direction.