Not the best picture but as a machinist for 40 years I always wondered how they cut a herringbone gear. I would love to see it happen. I guess I should check out youtube you never know.
Just look for it is all I had to do.......
[youtube]http://www.youtube.com/watch?v=DFEN9_t150c[/youtube]
Very expensive boo boo I bet!
[youtube]http://www.youtube.com/watch?v=TjQPTwH8-6A[/youtube]