Posted by BillS on May 14, 2014 at 16:53:44:
In Reply to: Re: hobbing a Worm posted by Greg on May 11, 2014 at 23:35:09:
Hi guys,
I've never done anything like this but it is a very interesting idea!
As Greg says, the disk cutter goes on the work spindle while the worm blank would mount where the hob cutter normally goes.
Index change gears would be for no. of teeth in cutter times 15, divided by index constant of machine. Swing the table for the correct angle of the resulting worm.
I'm guessing that one of the problems would be that the worm would be hourglass in shape, not cylindrical, to fit the contour of the imaginary gear whose OD would be the cutter's OD.