Commercial coffee machines and espresso machines depend on metal parts that can handle repeated assembly, hot water, steam, pressure, cleaning agents and long production cycles. For coffee machine brands, OEM buyers, engineers and purchasing managers, the manufacturing process behind coffee machine parts directly affects dimensional accuracy, corrosion resistance, surface quality, food-contact safety considerations and stable supply. Two common manufacturing methods for coffee machine components are CNC machining and investment casting, and many custom projects use both processes together. This guide explains how casting and CNC machining are used to manufacture metal coffee equipment components, when each process is more suitable, and why a combined manufacturing route can often support better cost control and production consistency. Why Manufacturing Process Matters for Coffee Machine Parts Coffee machine parts may look small, but their working conditions can be demanding. A threaded fitting, valve body, group head component or boiler connection must fit accurately with other parts, resist corrosion, maintain sealing performance and remain stable across repeated heating and cooling cycles. The selected manufacturing process influences dimensional accuracy, surface finish, corrosion resistance, assembly stability, pressure and temperature resistance, and overall cost control. For OEM batch production, process selection also affects whether every lot can meet the same functional and appearance requirements. If a part has complex geometry, internal passages or irregular shapes, starting with a near-net casting may reduce material waste. If a part requires tight tolerances, precise holes, threads or sealing surfaces, CNC machining is usually required. The key is not to choose one process in isolation, but to match the process to the drawing, material, tolerance, quantity and final application. Common Coffee Machine Parts Made by Casting or CNC Machining Metal coffee machine components can include both visible and internal parts. Some components require a polished appearance, while others are mainly designed…