More and more companies are implementing industrial robots for labor-saving and automation. Robots can replicate human joint movements, allowing them to perform tasks similar to those carried out by humans. They are used in various processes such as transporting, moving, loading, welding, painting, packing, processing, and assembly. In recent years, there has been a focus on preventing the scattering of lubricating oil used in the arm parts and reducing the weight of robots, leading to an increase in the use of plastics instead of metals. Plastics offer excellent earthquake resistance, oil resistance, chemical resistance, and insulation properties, and they do not rust. They are also ideal for preventing scratches on the workpieces they handle.