Hi Durkee,
I've got a beef with the general method that is standard for grinding a gash in the end flutes to make an slotmill "center cutting" The factory method seems to always be a gash with a perpendicular face, but this doesn't drill worth a crap: excessive wobbling of the cutter is common.
I take my brand new slot drills to the bench grinder (with a CBN wheel) and grind a rake face inside the flute, which morely closely approximates the actual helix of the cutter. This modified flute drills much better, with less clogging and wobbling.
Is this a particularly tough operation to program in today's cutter grinding equipment, or why do they persist in the "easy gash/crappy performance" method ?
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