I recently went modern and purchased a box of subject tool bits.? I had been led to believe that tool preparation was a thing of the past.
My 9" Model A? complained with growling and chattering, making a mess of a cut.? Investigation showed that the tool had no clearance between the shank and the work.?
Setting the point on centre helped for a few seconds but then the growling restarted.?
It appears to me that although the triangular insert is shaped, and might have necessary clearances, these are only on the thin insert.? The shank is only cut away parallel to one side of the triangle, the leading edge is vertical (shaped like a WWI destroyer bow).? Is it intended that we grind the shanks to provide the necessary clearances?? ?
