Quote:
Originally Posted by Cory
If you Google "cnc gear hobber" you'll find tons of examples. Not the same as a cnc mill with 4th axis at all. A gear hobber has to vary the angle the hob is presented to the work at in order to make different kinds of gears.
When not done on a dedicated hobbing machine, hobbing mostly occurs on y-axis equipped cnc lathes, minus some homebrew setups people have built with mills. I know 368 at one point had setup their mill to hob sprockets. I think there were pics on here somewhere, but you need to mechanically slave the rotary axis to the spindle.
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It's the "on the cheap" part that's not in google.
Industrial gear grinders and the like are beautiful things.
Whether or not you use wheel weights, if you're running a wheel at several thousand RPM, you'd better have an effective containment system to protect the outside world in case something spontaneously disassembles itself. - Alan Anderson [more] 
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