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Se tiene un tornillo de transmisin de potencia de rosca cuadrada con 4.5 hilos por pulgada , dimetro de paso de 7/8 plg con

Se tiene un tornillo de transmisin de potencia de rosca cuadrada con 4.5 hilos por pulgada , dimetro de paso de 7/8 plg con roscas dobles . El coeficiente de friccin de las roscas es 0.10, desprecie el coeficiente de friccin en el collarin . la carga de levante F= 750 lb.

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