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Drilling machine refers to a machine tool that mainly uses a drill bit to process holes on a work piece.

Drilling machine is usually dominated by bit rotation, and bit axial movement is feed movement. The drilling machine has simple structure and relatively low machining accuracy. It can drill through holes and blind holes, replace special tools, expand, spot facer, ream or tap. The work piece does not move during machining, let the tool move, align the tool center with the hole center, and make the tool rotate (main motion). The characteristics of drilling machine are that the work piece is fixed and the tool rotates;

Milling machine mainly refers to the machine tool that uses milling cutter to process various surfaces of work piece.

Milling machine is usually dominated by rotary motion of milling cutter, and the movement of work piece and milling cutter is feed motion. It can process planes and grooves, as well as various curved surfaces and gears.

Milling machine is a machine tool for milling work piece with milling cutter. In addition to milling plane, groove, gear tooth, thread and spline shaft, milling machine can also process more complex profile, with higher efficiency than planer, which is widely used in machinery manufacturing and repair departments.

Milling machine is a machine tool with a wide range of uses. It can process plane (horizontal plane, vertical plane), groove (keyway, T-shaped groove, dovetail groove, etc.), tooth splitting parts (gear, spline shaft, sprocket), spiral surface (thread, spiral groove) and various curved surfaces. In addition, it can also be used to process and cut off the surface and inner hole of the rotating body.