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Re: [TCML] Odd side effect--from a coil? (fwd)
To answer your question, in general, you magnetize with a DC coil (or permanent magnet) and demagnetize with AC. If you have a strong enough magnetic field, you may end up with some residual magnetization, but I don't recall seeing ferrous objects flying toward my coil, so I'm dubious that it was your coil.
--- On Wed, 1/20/10, Chip Atkinson <chip@xxxxxxxxxx> wrote:
> From: Chip Atkinson <chip@xxxxxxxxxx>
> Subject: Re: [TCML] Odd side effect--from a coil? (fwd)
> To: tesla@xxxxxxxxxx
> Date: Wednesday, January 20, 2010, 1:22 PM
> Forwarded ...
> Chip
>
> ---------- Forwarded message ----------
> Date: Wed, 20 Jan 2010 13:16:55 -0500
> From: mrapol@xxxxxxxxxxx
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Subject: Re: [TCML] Odd side effect--from a coil?
>
> Found on http://www.finishing.com/265/26.shtml :
>
> (quote)
> . . . there's a couple of ways to get magnetic stainless
> steel. First, if you are using a 300 series like 304, 316,
> etc (sometimes called an 18-8 grade) then work hardened
> material is magnetic. In other words, the mill that you buy
> it from has to have rolled it down some after they annealed
> it. The level of magnetism is related to the level of
> working, so heavily worked material is most magnetic. The
> downside of work hardened material is that it is harder to
> form and bend and cut.
>
> Second, you can use a ferritic or martensitic grade, also
> called '400 series'. For example, 440C is a cutlery grade,
> and after heat treating holds an edge well enough to be used
> for fine knives. 430 is a softer grade, about as strong as
> your current non-magnetic stainless.
>
> The Nickel Development Institute has a superb guide, called
> "Design Guidelines for the Selection and Use of Stainless
> Steel", their publication number 9014. If you look hard
> enough, you can find it and download it from their site at
> www.nidi.org. Otherwise, just call them and ask for one, and
> they'll send it. Free. They just enjoy telling the world
> about their favorite element.
>
>
> Lee Gearhart
> metallurgist
> East Aurora, NY
>
>
>
> (unquote)
>
> I don't know what grade my glasses are made of. I'll look
> into that. But my original question stands--can Tesla coils
> magnetize anything by proximity?
>
> Paul
>
> ----- Original Message ----- From: "Richard Schmuke" <rdj@xxxxxxxxxxxx>
> To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
> Sent: Wednesday, January 20, 2010 12:54 PM
> Subject: RE: [TCML] Odd side effect--from a coil?
>
>
> Just a note about stainless steel, poor quality and rust.
> The stainless used for antenna whips is normally 17-7.
> 17-7, 17-4, 15-5,
> 13-8 all are heat treatable, considered high grade SS, many
> used for
> fasteners but they will rust and/or corrode more than the
> cheaper, softer
> 300 series. Also the ones I have listed have different
> responses to a
> magnetic field. Most can be held by a magnetic chuck when
> grinding.
> Rich , KdØzz
> My wife complains I mess with stuff too much but I have a
> "tinkering virus"
>
>
> Rich
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx
> [mailto:tesla-bounces@xxxxxxxxxx]
> On Behalf
> Of davep@xxxxxxxx
> Sent: Wednesday, January 20, 2010 8:09 AM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Odd side effect--from a coil?
>
> > What amazes me is that stainless steel is non
> magnetic unless it is of
> > the poorest quality that would rust, so that feat
> would take an enormous
> > magnetic field.
> Varies with the 'stainless' Many sorts
> thereof.
>
> > I have heard tales of strange phenomena around coils
> tho. Like some
> > of the old timers stories of seeing St. Elmo's fire
> coming out of the
> > walls.
> I fail to see anything strange about that.
> Corona is standard in
> high fields. Reported (pre Tesla) by Lodge...
>
> >> I don't know hardly anything about magnets but I
> was under the impression
> >> that you need a huge magnetic field to magnetize
> things.
> Varies with the 'thing'.
>
> >>> I wear wire rim glasses. About 18 months ago I
> got new frames made of
> >>> stainless steel.
> Various grades of stainless.
>
> >>> After several months of experimenting with my
> modest tabletop coils,
> >>> I have found my glasses frames are
> magnetized.
> It would be interesting to know what
> other, if any experiments?
> Were the glasses nonmagnetic at start?
>
> best
> dwp
>
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