The circle from which are generated the involutes forming the profiles of gear teeth, having the form of a circle concentric with the pitch circle but of slightly smaller diameter.
Origin
Early 19th century; earliest use found in American Journal of Science.
Definition of base circle in US English:
base circle
noun
Mechanics
The circle from which are generated the involutes forming the profiles of gear teeth, having the form of a circle concentric with the pitch circle but of slightly smaller diameter.
Origin
Early 19th century; earliest use found in American Journal of Science.