The lost wax method simply consists of replicating the object to be cast in wax, then immersing it in a pool of sand/powder and leaving it to dry, so that the wax replica is covered with a sand coating. The wax replica is then covered with a sand coating and the procedure is repeated until the coating is sufficient to support the casting process, after which the wax is melted from the mold and withdrawn from the mold. The mold then needs to be heated several times to increase the hardness before it can be cast. This method has good accuracy, but is quite costly due to the high price of the sand/powder and the complexity of the production process, which requires several heats. expensive.
CNC machining refers to machining with CNC machining tools. CNC refers to CNC machine tools controlled by a CNC machining language for programming, usually G-code. CNC machining G-code language tells the CNC machine what Cartesian position coordinates to use for the machining tool, and controls the tool feed rate and spindle speed, as well as the tool changer, coolant and other functions. CNC machining has great advantages over manual machining, such as CNC machining to produce parts very accurate and repeatable; CNC machining can produce manual machining can not be completed with complex shape of the parts. CNC machining technology is now commonly promoted, most of the machine shop have CNC machining capabilities, the most common CNC machining in a typical machine shop are CNC milling, CNC turning and CNC EDM wire cutting (EDM wire cutting). CNC milling tool called CNC milling machine or CNC machining center. The lathe that performs CNC turning is called a CNC turning center. CNC machining G code can be manually programmed, but usually machine shop with CAM (computer-aided manufacturing) software automatically read the CAD (computer-aided design) file and generate G code program, the CNC machine control.
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