Re: 12" x 6" MAGNETIC cHUCK
The link Mike published far as i can tell has to do with magnetically
attracting NON-ferrous metal objects specifically aluminum as
referenced in that link. De-gaussing (de-magnetizing) ferrous metal
with AC is nothing new. Heating and or pounding magnetized steel will
also tend to de-magnetize as this dis-orients or un-realigns the
polarized molecules in magnetized steel.
The opposite of this for example is when a screw driver needs to be
magnetized. A strong magnet repeatedly run along the screw driver's
shaft in the same direction will align the magnetic North-South
vectors of the steel's molecular structure in the same direction
allowing the screw driver shaft to be a permanent magnet with
definite North-South poles. With current technology, this magnetizing
procedure does not work for non-ferrous metals.
Sometimes a magnetized screw driver is a blessing and other times its
"onebike2ride" <JZComputer@...> wrote:
> --- In GrizHFMinimill@yahoogroups.com, "Mike Nash" <mn.minimill@>demagnetizer
> > Would 1951 be modern enough?
> > http://www.lindsaybks.com/bks2/elmag/index.html
> This thread has lead me to make an assumption: The big
> unit I see in the CDCO Machinery <http://www.cdcotools.com/>catalog
> must be used for demagnetizing steel parts that essentially getturned
> into magnets after being exposed to a really powerful magneticfield,
> i.e. as per when mounted on a good magnetic chuck....
> Just wondering...
> John Z.