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The conformance to specification and quality of cylindrical gears is routinely handled by the use of elemental checks i.e. lead, involute, pitch variation and runout. Since there is no reference figure to define the form accuracy for bevel gears as the involute helicoid does for a cylindrical involute gear, it has not, until recently, been possible to check for tooth form accuracy, i.e. lead and profile (involute), on bevel gears. (1) The use of a coordinate measuring machine during the development process allows for optimization of the machine settings to achieve a tooth form which is proper for the intended application. This paper describes the development of a procedure used to establish and control the tooth form of heavy duty drive axle spiral bevel pinions and ring gears.

A new machine and process for rapid hard finish grinding of large non-generated bevel and hypoid gears and their mating pinions is described. A method for improved tooth contact using fourth order curvature control is presented. The process is most suitable for medium to small lot size production. A specially designed flaring cup shaped wheel is used for the gear member to enable the non-generated profile to be ground without burning.