The following sheet gives material properties used in a number of calculations. For demonstration purposes, you can get the values for a representative general-purpose ABS material. For safe torque limit for the life of the gear, enter one of the measures of service life, obtain the material's fatigue limit for the computed number of cycles, apply an appropriate safety factor, and enter the factored fatigue limit as bending stress. For maximum stall torque, enter the material's flexural yield strength as the bending stress. For stress analysis, enter applied force or torque and read the resulting stress.
All calculations assume that a full width radius is extended to the tooth root.
Plastic materials are notch sensitive, and shock loading may be a concern. All use of this system is subject to certain terms and conditions.