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Introduction In manufacturing, threading is the process of creating a screw thread. More screw threads are produced each year than any other machine element. There are many methods of generating threads, including subtractive methods (many kinds of thread cutting and grinding, as detailed below); deformative or transformative methods (rolling and forming; molding and casting); additive methods (such as 3D printing); or combinations thereof. 1. Casting:                         In casting threads are formed by the geometry of mould cavity in the mould or die. When material freezes in mould, it retains the shape after mould is removed. Generally low melting point alloy threads are made by this process; hence they are soft and not durable.                       These type of...
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  What is fin in heat transfer? Fin is an extended area used to increase the rate of convective heat transfer. The wings have been shown solely to give a sense of proportion. As with the flexible heat transfer formula, the heat transfer rate is directly proportional to the area specified in the convective medium. Thus, the wings help to expand the surface area in the surrounding area. First, heat is transferred from the body to the wings by means of a circular motion, and then the heat from the wings is transferred away by convection.   Properties of fins: The material for fins are selected on the basis of the following properties: - 1) High thermal conductivity 2) Light weight 3) Castability 4) Corrosion-resistant   Types of fins: Based on the operating condition and area available the fins are classified as, 1) Straight fins : The straight fins are generally arranged normally to the surface of the body and in parallel directions. Based on the...
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