Electrochemical machining versatility

Static electrode electrochemical machining techniques are limited in the form and accuracy of their machined products as metal is removed from the workpiece, the interelectrode gap increases and the metal removal rate falls. This problem may be overcome by continuously moving the tool (or the workpiece) in order to maintain a constant gap. This is the principle behind electrochemical forming (sometimes called electrochemical sinking), which is perhaps the most important and versatile application of electrochemical machining. 

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