Typically, the part is held in a rotating spindle using a chuck that can clamp with jaws or hydraulics to hold the part in place. Apart from that one fundamental similarity, they are two distinctly different processes.ĬNC turning occurs on a machine called a lathe where the material turns but the tool remains stationary. They are both subtractive, meaning they remove excess stock material to achieve the final result-your part. Milling and turning are two common CNC machining methods. For those of you looking for additional information, there will be links out to other pages, articles, and videos that will go into more detail. To keep it short and light, we’ll only skim the surface for milling and turning in this article. There are literally hundreds of books, guides, and videos that cover each of these processes, and even some – usually the longest ones – that only address small details of the process. This is also not the end all be all of turning or milling knowledge. We’ll largely be discussing 2D turning and 2.5D milling, ignoring machines and processes where turning and milling can seem blend into one complex process instead of two distinct ones. But for the sake of exploring the two processes, I thought I’d be an interesting thought experiment to look at them side by side. If your shop only has mills, you’ve got your answer. Should you mill the part or turn it? Ultimately that depends on the hardware available. You have a part to make and CAD drawings in hand.
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