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Machining vibrations, also called chatter, correspond to the relative movement between the workpiece and the cutting tool. The vibrations result in waves on the machined surface. This affects typical machining processes, such as turning, milling and drilling, and atypical machining processes, such as grinding. A ''chatter mark'' is an irregular surface flaw left by a wheel that is out of true in grinding 〔http://www.toolingu.com/definition-250230-5546-chatter-mark.html〕 or regular mark left when turning a long piece on a lathe, due to machining vibrations. As early as 1907, Frederick W. Taylor described machining vibrations as the most obscure and delicate of all the problems facing the machinist, an observation still true today, as shown in many publications on machining. Mathematical models make it possible to simulate machining vibration quite accurately, but in practice it is always difficult to avoid vibrations and there are basic rules for the machinist: * Rigidify the workpiece, the tool and the machine as much as possible * Choose the tool that will excite vibrations as little as possible (modifying angles, dimensions, surface treatment, etc.) * Choose exciting frequencies that best limit the vibrations of the machining system (spindle speed, number of teeth and relative positions, etc.) * Choose tools that incorporate vibration-damping technology. ==Industrial context== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Machining vibrations」の詳細全文を読む スポンサード リンク
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