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Gear teeth whose profile is formed by the trace of a point on a circle rolling without slippage on the outside or inside of the pitch circle of a gear; now used only for clockwork and timer gears.



Related Terms

DEDENDUM

The difference between the radius of the pitch circle of a gear and the radius of its root circle.

DIAMETRAL PITCH

A gear tooth design factor expressed as the ratio of the number of teeth to the diameter of the pitch circle measured in inches.

ANGULAR PITCH

The angle determined by the length along the pitch circle of a gear between successive teeth.

GEAR WHEEL

A wheel that meshes gear teeth with another part.

BASE CIRCLE

The circle on a gear such that each tooth-profile curve is an involute of it.

DENTAL COUPLING

A type of flexible coupling used to join a steam turbine to a reduction-gear pinion shaft; consists of a short piece of shaft with gear teeth at each end, and mates with internal gears in a flange at the ends of the two shafts to be joined.

ANGLE OF PRESSURE

The angle between the profile of a gear tooth and a radial line at its pitch point. Also known as angle of obliquity.

DEDENDUM CIRCLE

A circle tangent to the bottom of the spaces between teeth on a gear wheel.

FATIGUE CHUNKS

Thick three-dimensional particles exceeding 50 microns indicating severe wear of gear teeth.

HOBBING MACHINE

A machine for cutting gear teeth in gear blanks or for cutting worm, spur, or helical gears. Also known as hobber.

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