Dead Center

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dead center

[¦ded ′sen·tər]
(mechanical engineering)
A position of a crank in which the turning force applied to it by the connecting rod is zero; occurs when the crank and rod are in a straight line.
A support for the work on a lathe which does not turn with the work.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Dead Center


the extreme position of a piston in the cylinder of a piston engine, at which the motion of the piston changes direction. The piston position at the greatest distance from the crank is known as top dead center, and the position closest to the crank is known as bottom dead center. When the piston is at dead center, its velocity is zero, and the forces acting upon it do not generate an impulse (momentum) for displacement of the crank. In theoretical mechanics the positions of the piston at dead center are sometimes called limit positions (points).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Lathe centers support the workpiece between the headstock and the tailstock.
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The company reported the site includes offerings for turning threading & boring tools, diamond saw blades, cut-off tools, tap & die, parting & grooving tools, machine tool accessories, lathe centers, keyseat cutters & keys, insert drills & drilling inserts, hand tools, face mills, insert end mills & milling, end mills, drills & drill blanks as well as other cutting tools for metal, plastic, glass, wood and other applications.