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  • How Does Turning Work?
    Jun 08, 2018

    How does Turning work?


    Turning is lathe machining. Lathe machining is part of machining. Lathe machining mainly uses a turning tool to turn a rotating workpiece. Lathes, reamers, reamers, taps, dies and knurling tools can also be used for machining on lathes. Lathes are mainly used to machine shafts, discs, sleeves and other workpieces with rotating surfaces. They are the most widely used type of machine tooling in machinery manufacturing and repair factories.


    CNC Machined Parts.jpgWhen turning the inner and outer cylindrical surfaces, the turning tool moves in a direction parallel to the axis of rotation of the workpiece. When turning an end face or cutting a workpiece, the turning tool moves horizontally in a direction perpendicular to the axis of rotation of the workpiece. If the trajectory of the turning tool is at an oblique angle to the axis of rotation of the workpiece, the conical surface can be machined. Turning formed rotary surfaces can use the forming tool method or tool tip trajectory method. During turning, the workpiece is rotated by the spindle of the machine tool to act as a master; the turning tool held on the tool holder is used for the feed motion. Cutting speed v is the linear speed (m/min) at the contact point between the rotating workpiece and the lathe. The cutting depth is the vertical distance (in millimeters) between the workpiece surface and the machined surface at each cutting stroke. Cutting and forming turning are the length of contact (in millimeters) between the turning tool and the workpiece perpendicular to the feed direction. The feed amount indicates the amount of displacement (mm/rev) in the feed direction of the turning tool when the workpiece rotates one revolution, and it can also be expressed in terms of the feed per minute of the turning tool (mm/min). With high-speed steel lathe turning ordinary steel, the cutting speed is generally 25 ~ 60 m / min, cemented carbide turning tool up to 80 ~ 200 m / min; with coated carbide turning tool, the maximum cutting speed of up to 300 Meters/minute or more.

    If the turning tool is rotated at the same time as the turning tool rotates in the same direction as the workpiece, the relative trajectory of the turning tool and the workpiece can be changed, and the workpiece with the polygonal cross section can be machined. If the tool is longitudinally fed, a periodic radial reciprocating motion is imparted to the tool holder relative to each revolution of the workpiece, and the surface of the cam or other non-circular cross section can be machined. On a tooth turning lathe, the flank face of some multi-tooth tools and teeth can be machined according to a similar working principle, which is called "shovel back".