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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Some articles on turning:
... Speeds and feeds for turning are chosen based on cutter material, workpiece material, setup rigidity, machine tool rigidity and spindle power, coolant choice, and other factors ...
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.
Famous quotes containing the word turning:
“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 (17311800)
“God may be in the details, but the goddess is in the questions. Once we begin to ask them, theres no turning back.”
—Gloria Steinem (b. 1934)
“Many people operate under the assumption that since parenting is a natural adult function, we should instinctively know how to do itand do it well. The truth is, effective parenting requires study and practice like any other skilled profession. Who would even consider turning an untrained surgeon loose in an operating room? Yet we operate on our children every day.”
—Louise Hart (20th century)