Gear Technology Magazine
www.geartechnology.com/articles/20927-helical-gear-mathematics-formulas-and-examples

Helical Gear Mathematics Formulas and Examples

May 1, 1988
The following excerpt is from the Revised Manual of Gear Design, Section III, covering helical and spiral gears. This section on helical gear mathematics shows the detailed solutions to many general helical gearing problems. In each case, a definite example has been worked out to illustrate the solution. All equations are arranged in their most effective form for use on a computer or calculating machine.