Patent ID: 7937182

Claim:
A method of machining the flanks of a flank line crowned cylindrical gear in a diagonal generating method with a volute tool, said gear having an axis of rotation and said tool having an axis of rotation, said tool being positive or negative crowned in the direction of said axis of rotation, said method comprising: rotating said tool and said gear about their respective axes; engaging said tool and said gear; machining said gear by moving said tool diagonally relative to said gear according to a predetermined diagonal ratio and changing a center distance between tool and work piece during said machining to produce tooth flank surfaces on said gear, said tooth flank surfaces having a predetermined amount of crowning and flank twist; wherein said predetermined flank twist is composed of a first amount being a natural flank twist resulting from the predetermined flank line crowning of said gear, and a second amount being a flank twist created during machining according to said diagonal ratio, said first amount and said second amount being superimposed to provide said predetermined flank twist; and wherein said predetermined amount of crowning is composed of a first amount resulting from machining with the positive or negative crowned tool according to said diagonal ratio, and a second amount resulting from said changing a center distance between tool and work piece during said machining, said first amount and said second amount being superimposed to provide said predetermined crowning.