Posted by Drew on April 03, 2013 at 16:02:10:
In Reply to: Re: Hobbing Prime Spurs using differential posted by gearhead1 on April 03, 2013 at 13:25:22:
I calculate all my helical gear trains with the Barber Colman formula that is very similar to this one. The only difference is this formula seems to skip actually calculating the feed ratio. That may be your issue.