What material is the main spindle of a milling machine made up of?

 The main spindle of a milling machine is typically made of high-quality, hardened steel, such as chrome-molybdenum steel or nickel-chromium-molybdenum steel. These materials have high strength, excellent wear resistance, and good toughness, which make them suitable for withstanding the high forces and speeds involved in milling operations. In some cases, the spindle may also be coated with a hard material, such as tungsten carbide, to further enhance its wear resistance.

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