Free AGMA Standards AGMA 91FTM12-1991 pdf free AGMA 91FTM12-1991 pdf free.The Combined Mesh Stiffness Characteristics of Straight and Spiral Bevel Gears. As an example, three gear pairs are given; 1.0” (ace width of the straight and the spiral bevel gear, and 1.5” face width... 06-30-2021 Get More