{"data":{"fields":"term_definition","term_definition":"<div class=\"definition\">In bevel and hypoid gears generally refers to the plane surface perpendicular to the gear axis used to position the gear axially in a cutting, grinding, lapping, or testing machine or in its final assembly. See also Mounting Surface. It is also used to refer to the cylindrical surface (bore or shank) which determines the radial position of the gear during machining and at final assembly.<\/div>"}}