Symmetrical Parts
Many assemblies with reflection symmetry, such as the fuselages and wings of aircraft, the hulls of ships and boats, and the bodies of cars and trucks, require matched pairs of parts that are identical, or nearly identical, except for being mirror images of each other. (For example, the left and right wings of an airplane, or the left and right fenders or doors of a car.) Often these related parts are designated left-hand (LH) and right-hand (RH) parts. It is a common practice to give them sequential dash numbers, or -LH and -RH part number suffixes. It is also not uncommon to show only one of them on the drawing, and to define the symmetrical counterpart simply by stating that it is "opposite". Common notations include "left-hand shown, right-hand opposite" or "-1, LH (shown); -2, RH (opposite)".
Read more about this topic: Part Number
Famous quotes containing the words symmetrical and/or parts:
“The symmetrical piles of white bodies,
the round white breast-shapes of the heaps,
the smell of the smoke, the dogs the wires the
rope the hunger. It had happened to others.
There was a word for us. I was: a Jew.”
—Sharon Olds (b. 1942)
“It is evident, from their method of propagation, that a couple of cats, in fifty years, would stock a whole kingdom; and if that religious veneration were still paid them, it would, in twenty more, not only be easier in Egypt to find a god than a man, which Petronius says was the case in some parts of Italy; but the gods must at last entirely starve the men, and leave themselves neither priests nor votaries remaining.”
—David Hume (1711–1776)