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  1. 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. 2. A support for the work on a lathe which does not turn with the work.


Related Terms

CUTTING EDGE

  1. The point or edge of a diamond or other material set in a drill bit. Also known as cutting point. 2. The edge of a lathe tool in contact with the work during a machining operation.

CENTER OF EFFORT

The point of origin of net aerodynamic force on sails, roughly located in the geometric center of a sail, but the actual position of the center of effort will vary with sail plan, sail trim or airfoil profile, boat trim, and point of sail. Also known as center of pressure.

CENTERLESS GRINDER

A cylindrical metal-grinding machine that carries the work on a support or blade between two abrasive wheels.

CRANK ARM

The arm of a crankshaft attached to a connecting rod and piston.

TANGENT LATITUDE ERROR

On a nonpendulous gyrocompass where damping is accomplished by offsetting the point of application of the force of a mercury ballistic, the angle between the local meridian and the settling position or spin axis. Where the offset of the point of application of a mercury ballistic is to the east of the vertical axis of the gyrocompass, the settling position is to the east of the meridian in north latitudes and to the west of the meridian in south latitudes. The error is so named because it is approximately proportional to the tangent of the latitude in which the gyrocompass is operating. The tangent latitude error varies from zero at the equator to a maximum at high northern and southern latitudes.

POLE LATHE

A simple lathe in which the work is rotated by a cord attached to a treadle.

BIG END BEARING

A bearing at the larger (crankshaft) end of a connecting rod in an engine.
The bearings are made of cast steel and each consist of an upper and lower part secured to the connecting rod by means of fitting bolts, the nuts of which are secured. Compression shims are provided between the bottom end bearing and the palm of the connecting rod.
The bearings have white metal bearing surfaces provided with lubrication grooves for the necessary supply of lubricating and cooling oil. Shims of different thickness are inserted between the shells to enable adjustment of the bearing clearances (approx. 0.20-0.30mm).

BEAM BOLSTER

A rod which provides support for steel reinforcement in formwork for a reinforced concrete beam.

GOVERNOR SAFETY STOP

On throttling-type governors, the safety stop is a weighted arm that needs the support of a governor belt. If the belt breaks, the idler arm drops and shuts the steam supply valve to the engine. On Corliss units, the flyballs fall to the lowest position and knock off the safety cams; the cams disengage the catch blocks on the steam intake valves so that no steam is admitted to the engine.

DRILL JIG

A device fastened to the work in repetition drilling to position and guide the drill.

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