How can I find the differential formula for my hobbing machine?
There are sources listed in FAQ “Manuals for my Gear Cutting Machinery” that may have the operator’s manual you need. Also, the Gear Forum is a good place to ask for this kind of help. If you can’t find a source for the differential formula then you can determine the formula for yourself using the following procedure, but you must have a way to measure a gear’s lead. Lead is the distance traversed along the gear’s axis to execute one complete spiral revolution of a tooth centerline about the axis. Gear lead can also be calculated from the Helix Angle, but measuring helix angle accurately is beyond the scope of this FAQ. WARNING: Since this procedure involves using the hobbing machine under power, you want to carefully understand and observe each step. If you are unfamiliar with hobbing, hob machine setup, or basic gear specification, then you should arrange to have competent assistance with you before attempting the following procedure at the machine. Start by looking at other FAQ’s in
