Posted by Mike on September 11, 2008 at 22:40:01:
In Reply to: Re: helical posted by BillS on September 11, 2008 at 17:32:29:
Does the the lead need to be multiplied by 2 to figure differential for double thread hob when the constant is 7.5/lead?
The hob is .005 thin. I believe it's to leave stock for shaving, although I intend to finish hob by going deeper.