I'm puzzled by that too Dickey. The back-slanted edge is hitting the workpiece at a tangent, and the cutting interface would be that point of intersection plus the DOC, which is very small. I'm having a hard time picturing how the shear angle works. Unlike a positive or negative rake tool, the 45° shear angle seems to be pushing the metal out in front of the work, towards the headstock?
Originally Posted by DICKEYBIRD
Seems like using a endmill would provide a better cutting surface, since it would have a gradual entry into the workpiece.
As Nick and other have said, this tool is casually mentioned in a lot of the old machinists texts, mostly as a finishing tool for a shaper. I'll try to get time in the shop today to grind one and try it...
"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did."