Toroids are made by slicing rings from a tube of green material, sintering
the slices to burn of the binders and harden the rings, then tumbling the
finished rings in a vibratory bowl finisher to deburr them. The stones or
"media" used in the finisher can't get to the id as readily as it can get
to the od, so the finished product is left with sharper radii on the id
than on the od.
There are other means of deburring that would not have this side effect,
however tumbling is vastly cheaper than any of the alternatives. You just
pour a bucket of parts in a machine, press the "on" button, then fish them
out again 8-12 hours later.
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