Posted by Michael on June 05, 2014 at 07:49:40:
Hello when I cut 20 pa spur gears on all of my hobbing machines , more so on pinions say 5dp, I get a flat spot from the od to the pitch line on one side of the gear tooth. It happens on even a newer machine, maybe it's the hob angle setting? The backlash in the worms are minimal.