Turning
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.
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Famous quotes containing the word turning:
“‘A parted ev’n just between twelve and one, ev’n at the
turning o’ the tide; for after I saw him fumble with the
sheets, and play with flowers, and smile upon his finger’s
end, I knew there was but one way; for his nose was as sharp as
pen, and ‘a babbled of green fields.”
—William Shakespeare (1564–1616)
“Turning and turning in the widening gyre
The falcon cannot hear the falconer;
Things fall apart; the centre cannot hold;
Mere anarchy is loosed upon the world,”
—William Butler Yeats (1865–1939)
“The camera has an interest in turning history into spectacle, but none in reversing the process. At best, the picture leaves a vague blur in the observer’s mind; strong enough to send him into battle perhaps, but not to have him understand why he is going.”
—Denis Donoghue (b. 1928)