Bevel gears, pressure angles and their relationship
The bevel gear is standardized with a 20º pressure angle, also made with 14½º, 16º, 17½º, 22½º, 25º, and 35º pressure angles. For straight bevels, the AGMA standard recommends pressure angles of 20º and, for 12 or 13 teeth, 25º. The angle is measured normal to the surface of the tooth. The smaller angles are sometimes …
