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Re: [TCML] Odd side effect--from a coil? (fwd)
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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