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SOLUTION (10.1) Known: Schematic and Given Data
Schematic and Given Data: Load 3,500 lb Double-threaded Acme stub screw d = 2 in. dc = f = 0.11 f f = 0.10 c dc fc dm 2.75 in. Assumptions: 1. The starting friction is about 1/3 higher than running friction. 2. The screw is not exposed to vibration. Analysis: 1. From Table 10.3, there are 4 threads per inch. p = 1/4 = 0.25 in.
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