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Mechanical Definitions

Counterblow hammer : A forging hammer in which the ram and anvil are driven toward each other by compressed air or steam.

Coupled engine : A locomotive engine having the driving wheels connected by a rod.

Crank : A link in a mechanical linkage or mechanism that can turn about a center or rotation.

Crank web : The arm of a crank connecting the crankshaft to crankpin, or connecting two adjacent crankpins.

Crawler wheel : A wheel that drives a continuous metal belt, as on a crawler tractor.

Crushing-forming : Shaping the face of a grinding wheel by forcing a rotating metal roll into it.

Culvert : It is made at the point of lowest valley to pass water across the embarkments of roads or railroads. It may be used to enclose a flowing body of water.

Cumulative compound motor : A motor with operating characteristics between those of the constant-speed (shunt-wound) and the variable-speed (series-wound) types.

Curtis stage : A velocity-staged impulse turbine using reversing buckets between stages.

Curtis turbine : A velocity-staged, impulse-type steam engine.

Cutoff : The shutting off of the working fluid to an engine cylinder. The time required for this process.

Cutterhead : A device on a machine tool for holding a cutting tool.

Cutting tool : The part of a machine tool which comes into contact with and removes material from the work-piece by the use of a cutting medium. Also known as cutter. The figure shows the carbide turning tools.

Cutting tool inserts : These are the carbide tips used in the tool holders and used for various operations particularly on lathe machines. The various shapes of these inserts are given below.

Cylinder actuator : A device that converts hydraulic power into useful mechanical work by means of a tight-fitting piston moving in a closed cylinder.

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