{"data":{"fields":"term_definition","term_definition":"<div class=\"definition\">The circle derived from a number of teeth and a specified diametral or circular pitch. Circle on which spacing or tooth profiles is established and from which the tooth proportions are constructed. The curve of intersection of a pitch cylinder or cone and a plane of rotation. For bevel and hypoid gears it is understood to be at the outer ends of the teeth, unless otherwise specified. The circular end view or cross-section view of the pitch surface of a gear is called the pitch circle. The working surfaces of the teeth pass through the pitch surface. Therefore, the intersection of the tooth surface with the pitch surface becomes a line, called the pitch line..<\/div>"}}