Transcription of UNIT 5 DESIGN OF SCREWS, FASTENERS Design of Screws, …
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UNIT 5 DESIGN OF SCREWS, FASTENERS Design of Screws, …
105 DESIGN of Screws, FASTENERS and Power Screws UNIT 5 DESIGN OF SCREWS, FASTENERS AND POWER SCREWS Structure Introduction Objectives Geometry of Thread Mechanics of Screw and Nut Pair Power Screw Mechanics Application of Power Screw Standard Threads DESIGN of Screw and Nut Threaded Fastener Failure of Bolts and Screws Permissible Stresses in Bolts Summary Key Words Answers to SAQs INTRODUCTION Screws are used for power transmission or transmission of force. A screw is a cylinder on whose surface helical projection is created in form of thread. The thread will have specified width and depth, which bear some ratio with the diameter of the cylinder. The screw rotates in a nut, which has corresponding helical groove on the internal surface. Thus a nut and a screw make a connected pair in which one remains stationary while other rotates and translates axially.
110 Machine Design The force P has to overcome the friction as well as cause lifting of the body in vertical direction. To find the relationship between force P, called effort, and weight of the body, W, we have to consider the equilibrium of the body on an inclined plane as shown in Figures 5.7(a) and (b). The free body diagram clearly shows forces along and
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