Here are some shots of the latest model of the water pump. The gears were taken from a remote controlled car and we have left them in the chassis so we don’t need to make a new housing, that is if the gears are even used, which is dependant on my trip to a hobby store tomorrow. Basically the teeth on the sprocket fixed to the step motor are too thin to mate with the sprocket on the drive shaft. There are a number of options that are open to us which include: making our own gear system with laser cut or bought gears, a chain drive or if worse comes to worse cutting new windmills for the pump with an alternative female drive hole.
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