Hobbing also simplifies gear design. Parameters such as diametral pitch or module, profile angle, addendum, whole depth, and fillet-radius proportions define the cutting edge of the hob, called ...

When a job calls for designing nonstandard gearing, you might crunch through the AGMA or ISO calculations or turn to one of several gear-design programs.

Following an earlier proposal for transcribing the angle of hob profile teeth measured in inches, our correspondent now describes how to execute a similar task with metric measurements: “The U.S.