A method of machining a bevel gear (22) having teeth with a pitch angle greater than 90 degrees comprising providing at least one tool (42, 44) rotatable about a tool axis with the tool comprising a disc-shaped body (43) having a periphery (49) and at least one stock removing surface (45, 47) arranged about the periphery. The tool is rotated and fed relative to the gear to effect machining of at least one tooth surface wherein the machining is carried out in a non-generating manner.

A method of machining a bevel gear (22) having teeth with a pitch angle greater than 90 degrees comprising providing at least one tool (42, 44) rotatable about a tool axis with the tool comprising a disc-shaped body (43) having a periphery (49) and at least one stock removing surface (45, 47) arranged about the periphery. The tool is rotated and fed relative to the gear to effect machining of at least one tooth surface wherein the machining is carried out in a non-generating manner.

An internal gear machining method and an internal gear machining device, are provided for grinding of a tooth profile of an internal gear using a barrel-shaped threaded grinding wheel. An NC device functions as a tooth profile error correction means and reduces a measured pressure angle error of a workpiece at a tooth face by correcting the radial position, the lateral position of the grinding wheel, the turning angle of the grinding wheel, and the helical motion; reduces a measured error in the direction of a tooth trace of the workpiece at a tooth face by correcting the helical motion; and reduces a measured tooth thickness error of the workpiece at a tooth face by correcting the radial position, the lateral position of the grinding wheel, and the helical motion.

A gear hobbing apparatus for producing a gear from a blank according to one example of the present disclosure can include a hob, a first series of hob teeth and a second series of hob teeth. The hob can have a cylindrical hob body. The first series of hob teeth can extend from the cylindrical hob body and have a first whole depth. The second series of hob teeth can alternately extend from the cylindrical hob body with the first series of hob teeth and have a second whole depth. The first and second whole depths are distinct and configured to create a gear from the blank that has adjacent teeth having distinct outer diameters.

A gear hobbing apparatus for producing a gear from a blank according to one example of the present disclosure can include a hob, a first series of hob teeth and a second series of hob teeth. The hob can have a cylindrical hob body. The first series of hob teeth can extend from the cylindrical hob body and have a first whole depth. The second series of hob teeth can alternately extend from the cylindrical hob body with the first series of hob teeth and have a second whole depth. The first and second whole depths are distinct and configured to create a gear from the blank that has adjacent teeth having distinct outer diameters.

A gear hobbing apparatus for producing a gear from a blank according to one example of the present disclosure can include a hob, a first series of hob teeth and a second series of hob teeth. The hob can have a cylindrical hob body. The first series of hob teeth can extend from the cylindrical hob body and have a first whole depth. The second series of hob teeth can alternately extend from the cylindrical hob body with the first series of hob teeth and have a second whole depth. The first and second whole depths are distinct and configured to create a gear from the blank that has adjacent teeth having distinct outer diameters.