Patent ID: 6939093

Claim:
A chamfer hob for providing a chamfered end having a chamfer angle m at both a front face and a back face of a gear, the hob comprising: a shaft; a plurality of helical cutting vanes extending radially outwardly from the shaft, such that the radially outward surface of the cutting vanes defines a hob diameter 2r, and a hob radius r, a predetermined radial width a of the desired chamfer as determined by a projection of the depth of chamfer b at the chamfer angle m, and the depth of chamfer b being defined by b=a (sin m) wherein the parameters of the hob are defined by the following equations: c =(hob diameter)/2 −b or c=r−b d =( c )sin(90 °−m ) e =( c )cot(90 °−m ) g=e −dedendum of gear f =√[( g ) 2 +( d ) 2 )] j=e −whole depth of gear h = √[( j ) 2 +( d ) 2 ].