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



Related Terms

BASE CIRCLE

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

INCIDENCE

l. Partial coincidence, as a circle and a tangent line. 2. The impingement of a ray on a surface

ADDENDUM CIRCLE

The circle on a gear passing through the tops of the teeth.

ANGULAR PITCH

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

TANGENT

A line that touches but does not cut the circumference of a circle.

OBLIQUE EQUATOR

A great circle the plane of which is perpendicular to the axis of an oblique projection. An oblique equator serves as the origin for measurement of oblique latitude. On an oblique Mercator map projection, the oblique equator is the tangent great circle.

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.

CYCLOIDAL GEAR TEETH

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.

SIMPLE HARMONIC MOTION

The projection of uniform circular motion on a diameter of the circle of such motion. The combination of two or more simple harmonic motions results in COMPOUND HARMONIC MOTION.

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