What information is necessary to specify a STRAIGHT bevel gear summary?
These notes will help you specify a summary for Gleason ® Machine Numbers 12, 14, 24A, and 2A. (If you are setting up a 2A Coniflex ®, we may also need to discuss your available tooling, feed cam selection, etc.) You need the following to specify a straight bevel gear: (1) Teeth – number of teeth for BOTH members of a gearset. Even if you are producing only one member, you must know teeth in the mating member. If teeth are equal, the set is a MITER set. If not, the smaller number of teeth defines the PINION member and its mate is the GEAR member. (2) Pitch – If you are working from a print, the pitch (or module or circular pitch) is specified. But if you only have a sample, determine pitch from dividing (teeth+2) by “sharp” OD. “Sharp” OD is used here to mean outside diameter of the sample gear where the face cone and back cone surfaces intersect; in other words, the OD where sharp edges would be formed. Don’t rely on rack style gear gages to measure pitch. (3) Pressure Angle (PA
