On Tuesday 24 July 2012 06:30:42 mark center did opine:
I use 0 to 5 degree rake and 2 to 3 degrees absolute flank clearance.
The compound angle, viewed orthogonal to side view, is about 10 to 15
degrees. The spiral effect (lead angle) causes entering side to be
more acute than exit. Nothing
To Andy Steve;
I made another of the dual thread screws yesterday, and can report that it
seems to work well. However it seems that I must have a flexibility
problem in using a cutoff knife sharpened with a 60 degree V and a slight
(10 degree?) hook though. Or it doesn't have sufficient
I use 0 to 5 degree rake and 2 to 3 degrees absolute flank clearance.
The compound angle, viewed orthogonal to side view, is about 10 to 15
degrees. The spiral effect (lead angle) causes entering side to be
more acute than exit. Nothing is really terribly critical as long as a
cutting flank does
