What is turning?

  • (noun): A movement in a new direction.
    Example: "The turning of the wind"
    Synonyms: turn
    See also — Additional definitions below


Turning is a machining process in which a cutting tool, typically a non-rotary tool bit, describes a helical toolpath by moving more or less linearly while the workpiece rotates. The tool's axes of movement may be literally a straight line, or they may be along some set of curves or angles, but they are essentially linear (in the nonmathematical sense). Usually the term "turning" is reserved for the generation of external surfaces by this cutting action, whereas this same essential cutting action when applied to internal surfaces (that is, holes, of one kind or another) is called "boring". Thus the phrase "turning and boring" categorizes the larger family of (essentially similar) processes. The cutting of faces on the workpiece (that is, surfaces perpendicular to its rotating axis), whether with a turning or boring tool, is called "facing", and may be lumped into either category as a subset.

Read more about Turning.

Some articles on turning:

Dynamics of Turning - Speeds and Feeds
... Speeds and feeds for turning are chosen based on cutter material, workpiece material, setup rigidity, machine tool rigidity and spindle power, coolant ...

More definitions of "turning":

  • (noun): Act of changing in practice or custom.
    Example: "The law took many turnings over the years"
  • (noun): The act of changing or reversing the direction of the course.
    Synonyms: turn

Famous quotes containing the word turning:

    We Abolition Women are turning the world upside down.
    Angelina Grimké (1805–1879)

    The scholar was not raised by the sacred thoughts amongst which he dwelt, but used them to selfish ends. He was a profane person, and became a showman, turning his gifts to marketable use, and not to his own sustenance and growth. It was found that the intellect could be independently developed, that is, in separation from the man, as any single organ can be invigorated, and the result was monstrous.
    Ralph Waldo Emerson (1803–1882)

    No one can go on being a rebel too long without turning into an autocrat.
    Lawrence Durrell (1912–1990)