{"data":{"fields":"term_definition","term_definition":"
The assumption that a cone may be substituted for a spherical surface when analyzing the radii of curvature of the surfaces in bevel gears. Theoretically, the outer ends of bevel gear teeth terminate on a spherical surface whose center is at the pitch apex. To layout the teeth of a bevel gear on this spherical surface would necessitate a spherical drawing board. By substituting a cone whose elements are perpendicular to the pitch cone of the bevel gear and whose apex lies on the gear axis, it is possible to develop the cone into a plane surface.<\/div>
\"ED-110a\"<\/div>"}}