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Dan, great picture of the Lima shop! Where did you locate that?
Interesting pictures, thanks for posting.With regards to the Gleason bevel gear generator I have seen one in action. I don't recall it using rotary cutters? It has two tools that reciprocate, one cutting and one being retracted alternately. As the cut progresses the gear being cut rotates and the whole cutter head also rotates about the axis of what would be the mating gear. So the cutters stay in sync with the tooh being cut, but effectively move outwards. As Dan says it is quicker than other types of machine as it cuts both sides of a tooth in each pass. It generates the tooth form as a series of lines in a similar way to hobbing of spur gears.Andrew