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The chapters of this book are divided into three parts, namely ssss1: Manufacturing Processing Techniques, ssss1: Characterization and ssss1: Analysis.

ssss1 contains ssss1–ssss1, ssss1 contains ssss1 and ssss1 and ssss1 contains ssss1–ssss1.

ssss1 explains an advanced technique called additive manufacturing (AM), which is predominantly known as 3D printing and rapid prototyping. It is an on-demand production without any dedicated apparatus or tooling, which allows breakthrough performance and supreme flexibility in industries. The aerospace industry is the primary user of AM, as it enables it to create complex user-defined part design and fabricate with different lightweight materials without wastage of raw materials, reducing the time and cost of production. This chapter provides in-depth knowledge about its classification and selection process for various applications required by engineering industries, especially in the aerospace industry.

ssss1 mainly deals with the manufacturing of polymer gears. Polymer gears are widely used in medical devices upon which human lives depend. In addition, they are useful in other applications such as in the automotive and manufacturing industries. A precise gear of better design and effective manufacturing process decides its long-term application, strength and property. Polymer gears can be fabricated with the same machining process as metal gears, usually milling or hobbing from a blank. However, for lightweight materials, such as polymers, it is preferable to be either fabricated by injection molding or machined from a rod (additive manufacturing). The details of such manufacturing techniques are presented in this chapter.

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