Easy, if you have a D C welder. Simply wrap the lead around the piece
several times and hold it in a dead short. Check the piece and if it's more
magnetized, just reverse the polarity and short again. Keep doing this until
the magnetism is gone. Learned this from an old railroad man back in the
50's and it worked
Walt.
"RoyJ" wrote in message
ink.net...
Put it in an AC magnetic field. I have a 500' coil of 14 ga TW building
wire, hook it to the AC output of a heavy duty battery charger.(you have
to go inside to find the lead) Resistance is a bit over an ohm, would draw
about 9 amps on 12 volts. Shoudl be a big enough coil for your part. It
might have to sit there for a few minutes.

Dave Hinz wrote:
Building a project out of a piece of 4140 prehard. The local custom
metalcutting shop provided the steel. Problem is, it's magnetic. Not
just a little magnetic, it's "you could use this thing to pick up nails,
small children, and battleships" magnetic. I asked them if they have a
demag ring, they don't (and were surprised but will check their stock...
ok, great, but doesn't help me much at the moment).

So how do I demag this sucker? I know that heat would do it, but I
don't want to mess up my hardening. I know mechanical impact can redue
it, but I don't know if that's one of those "theoretical but not
practical" things, or if it'd work. So, simple question - can I just
smack the (un-machined) end of this sucker with a hammer a bunch of
times and get it down to tolerable, or do I need to find someone with
degaussing apparatus of some sort, or am I SOL? It's annoying, to say
the least, to have every chip re-attach itself to the work, invariably
on the layout lines that I'm trying to see.

Thanks,
Dave Hinz