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Engineering, 13.07.2020 21:01 camzs
3. (9 points) A square-thread power screw is used to raise or lower the basketball board in a gym, the weight of which is W = 100kg. See the following two figures. For power screws, assume a major diameter d = 20mm, and a pitch of p = 2mm with double threads. The friction coefficient of steel parts is f = 0.1. Gravity constant is g = 10/kg. (a) (7 points) If the purchased Cordless Electric Power Screwdrivers rotates at 300rpm, determine the power you need to raise to the basket board. (b) (2 points) Check if the self-locking condition of the power screw is satisfied or not.
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3. (9 points) A square-thread power screw is used to raise or lower the basketball board in a gym, t...
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