Parallels (engineering)
Parallels are rectangular blocks of metal, commonly made from tool steel, stainless steel or cast iron, which have 2, 4 or 6 faces ground or lapped to a precise surface finish. They are used when machining with a mill, drill or any other machining operation that requires work to be held in a vise or with clamps - to keep work parallel or raised evenly such as in a milling vise to give adequate height for the cutting tool/spindle to pass over.
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Famous quotes containing the word parallels:
“If, while watching the sun set on a used-car lot in Los Angeles, you are struck by the parallels between this image and the inevitable fate of humanity, do not, under any circumstances, write it down.”
—Fran Lebowitz (b. 1950)