A member in bending due to the 40 lbforce at the right end is to be sized. Say the thickness is 0.25 in, but the height in the plane is to be determined. Let the maximum allowable bending stress be 12,000 psi. Consider three cross-sections: (a) midway between the supports, (b) at the roller, and (c) midway between the roller and the load at the end. For each cross-section determine the minimum necessary height so that the maximum bending stress is 12,000 psi

unlike the threaded fasteners which are used to clamp the machine members, power screws are used to transmit power. common applications of power screws are: screw jacks: to lift weight. lead screw of lathe: for axial movement of tool and its precise positioning.

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