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.

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).

References in periodicals archive ?
Worldwide Industrial designed its new cutting tools manufacturers & distributors directory as a user-friendly and extensive resource for those sourcing saw blades, end mills, lathe centers, drilling inserts, drill blanks, countersinks, tap & die, hand tools, keyseat cutters, face mills, counterbores, reamers and other tools to cut virtually every material that can be cut," said Stevens.
Lathe centers support the workpiece between the headstock and the tailstock.
Using a 4-jaw chuck and centering the barrel, lathe small 60 degree bevels at the edge of the bore for the lathe centers or use a bore center reamer as available from Pacific Tool and Gauge to provide a suitable fit for the lathe centers.