I wound up just sticking one in a pin vise and used it manually.
Nice finish but I was hoping for faster work in hard to reach
spots. Anyone have these down? Clue me in?
Now that the huge, eggshell-like trillion solitaire platinum
earrings are out of the way, life is a little more relaxed. I’ve
never used the rotary carbide burnishers, but assuming they are being
used for porosity removal, there’s a better way, anyway. Get an old
bur or anything that’s tool steel - not a mandrel because they’re
soft. Put it in a vise, heat it, and bend the end of it to a 30
degree or so angle. Re-heat treating it is optional. Then grind a
face on the bent end that has rounded edges, and polish it. In the
flex shaft it will rotate and go “whap, whap, whap”, and works
perfectly against porosity in gold and other metals, too. I have one
that’s the full shank size, and one that’s made from a small bur that
has about a 1.5 mm face, for tight spots.