Posted by BillS on August 04, 2008 at 23:30:16:
In Reply to: Re: Hobbing Problem from Mike S posted by Ron V on August 01, 2008 at 20:59:37:
You're right Ron. The differential gear ratio should be half that for a single lead hob. I didn't catch that until re-reading his posting. If he didn't halve the differential gear ratio, seems like the angle would be way off, not tracking at 30 deg...