Question

what is called milling ​

Answer 1

Answer---

A machine tool for rotating a cutter (milling cutter) to produce plane or formed surfaces on a workpiece, usually by moving the work past the cutter.

Answer 2

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Milling is the process of machining using rotary cutters to remove material by advancing a cutter into a work piece. Milling covers a wide variety of different operations and machines, on scales from small individual parts to large, heavy-duty gang milling operations.