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.

Famous quotes containing the word turning:

“Roll unmanly over this turning tuft,
O ring of seas, nor sorrow as I shift
From all my mortal lovers with a starboard smile....”
—Dylan Thomas (1914–1953)

“I heard the bell tolled on thy burial day,
I saw the hearse that bore thee slow away,
And, turning from my nursery window, drew
A long, long sigh, and wept a last adieu!”
—William Cowper (1731–1800)

““Really, friend, I can’t let you. You may need them.”
“Not till I shrink, when they’ll be out of style.”
“But really I——I have so many collars.”
“I don’t know who I rather would have have them.
They’re only turning yellow where they are.
But you’re the doctor, as the saying is.
I’ll put the light out. Don’t you wait for me....””
—Robert Frost (1874–1963)