A screw is a mechanical system that converts rotational motion in to linear motion. In other worlds it converts rotational force (torque ) in to a linear force. Here the resultant axial force due to an input torque is calculated from first principles.
A screw thread is a helical groove formed on an internal or external diametrical surface and is described by various terms including pitch, root, crest, flank and major diameter. These terms are described here.
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