I recently went through some iterations making a wire bending tool for a customer. I sheared some stainless dowel pins in testing. Then I tried some alloy steel dowel pins and made a series of test bends with material and applications far hard than the customer claims he's doing. The customer managed to shear one of those. Finally I went to high speed steel drill blanks. Close tolerance set in Loctite 640 cut just barely long enough to do the job to minimize leverage against the pins. The math says I have a fair safety margin.
Of course HSS drill rod doesn't come in nice convenient standard dowel lengths so I had to cut the pins with an abrasive tool. A little fiber Dremel disc on a rotary hand piece. Of course that leaves a burr which I ground off with a diamond conical point, but the diamond reacts with steel at grinding temperatures and of course only lasted long enough to deburr a few pins.
It seems that small rotary grinding points exist in a conical with CBN, but actually finding them for sale is being a bit of a struggle. McMaster seems to have no small CBC grinding points, and Penn Tool only has cylindrical.
Of course I sent one replacement rotating assembly off to the customer (4 pins its double ended) and then I finished one for myself. I would like to make small batches of these for customers, but I don't want to have to replace a diamond conical grinding point after every few pins. who actually stocks them online? Searches just keep coming up with diamond. I don't want diamond.
A 1/4 inch conical with a 60 degree point and an 1/8 inch or 3mm shank would be ideal, although I do have a few rotary hand pieces with 1/4 inch collets as long as the grinding point isn't so big or gets in its own way or blocks my view while working.