Abstract
The tooth form factors of profile shifted gears have been calculated under the conditions that the load is assumed to be concentrated at the highest point of single pair contact and the dangerous section for tooth breakage is determined by the Hofer's method. These results are compared with the approximate method in DIN 3990. In the ordinary range of the addendum modification coefficient the difference between the two is up to 15%, so the approximate method in DIN 3990 is enough to the practical use. The form factors depend on the loading point, position of the section where nominal stress is calculated and dimensions of the cutting tool such as the radius of its tip round and its clearance factor. These effects on the tooth form factor are made clear and shown graphically.
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