"RAM³" writes:

If you have some grinding left to do on it, wrap a heavy extension cord [the
longer the better] around it, plug in the grinder, and go to work on it.

By the time you're ready to reposition it for the next round [having, I
hope, NOT ground through the wire...], the piece should be degaussed.

This won't work. The extension cord contains two conductors with equal
and opposite currents at all times, so the magnetic field produced by
the cord is almost nil.

You *could* do this by making up an "extension cord" using two single
conductors, and wrapping one conductor into a coil while the other conductor
bypasses the coil. Or put both conductors in the same coil, but wind
one wire clockwise and the other counterclockwise.

Dave