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    Mechanical device to lower a raised weight

    Hi, I am trying to design a small machine that lowers a raised weight slowly. For example if i raise the weight by 10 metres and allowed there it should start descending at 0.1m/hour. Initially i thought of a windup mechanism but i dont know how to control the rate of descent with a windup...
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    Energy storage in spring

    Hi, I am thinking of a device, i dont know if a similar one exists already but this is what it is supposed to do. 1. compress(or extend) a spring by way of some mechanical force like turning a wheel(this wheel could very well be that of a bicyle) 2. Once the spring is compressed(or...