Aspects of this topic are discussed in the following places at Britannica.
Most cut gears produced in large lots are made on machines that utilize the gear-generating method. This method is based on the principle that two involute gears, or a gear and rack, with the same diametral pitch will mesh together properly. Therefore, a cutting tool with the shape of a gear or rack may be used to cut gear teeth in a gear or rack blank. This principle is applied in the design...
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