AGMA is an accredited standards development organization with the American National Standard Institute that produces quality consensus standards designed to meet the demand of domestic and the international markets. AGMA hold the position of Secretariat of ISO Technical Committee and promotes a better understanding of the concerns of American gear manufacturers, as well as wider acceptance of AGMA standards. The association also promotes the dissemination of research and development work conducted throughout the industry related to gear design and manufacture at major meetings and seminars.
The standard method for determining induced bending stresses in bevel gears comes from the AGMA. Gears shall be designed in accordance with the AGMA standards 211.02 and 221.02. Bearings shall be ball or roller type and shall be selected in accordance with AGMA standards 265.01. The aerator shall be stainless steel of adequate size to transfer the applied torque and to resist bending. To maximize strength and performance the rotor shall be one piece molded fiberglass of monolithic construction and internally reinforced with a steel structure.
AGMA gear quality numbers range from 3 to 15 and identify the accuracy level of the tooth element tolerances that are permissible in the manufacture of each particular gear in terms of its specialized use. The permissible tolerances for the different quality numbers may be obtained from AGMA standards, which show the type of gear and the permissible tolerances and inspection dimensions.
| Total thickness tolerance classes for spur, helical and herringbone gears All tolerance value in inches | |||||
| AGMA quality number | Diametrical pitch | classes | |||
| A | B | C | D | ||
| 7 | 0.5 | 0.074 | - | - | - |
| 1.2 | 0.031 | - | - | - | |
| 2.0 | 0.019 | 0.0093 | 0.0048 | ||
| 3.2 | 0.012 | 0.006 | 0.003 | ||
| 5.0 | 0.0075 | 0.0037 | 0.0019 | ||
| 8.0 | 0.005 | 0.0025 | 0.00125 | 0.00063 | |
