Moldable Iron Powder
Tim Wescott
that Home Depot sells magnetic paint.
The project is a levitating globe thingie, designed as a control systems
trainer that lets the student program the control rules in C and see how
different control strategies lead to different sorts of system
performance.
The paint got me thinking -- if they can make latex paint with iron
powder in it, can I buy some sort of plastic resin with iron powder in it
and make my own custom magnetics on the cheap?
So: does anyone know of an iron-powder/epoxy (or whatever) mix out there
that you can buy, or an iron powder material that you can mix with your
own resin to mold soft magnetic materials out of?
I'm looking to build some cores, and maybe have some made at a low volume
if the prototypes work. I do _not_ need super high permeability -- the
air gap in this is so big that according to the FEA program I'm using
there's not much difference between core material with a relative
permeability in the hundreds vs. iron (with relative permeability in the
thousands).
Thanks.
PeterD
wrote:
>A long-term back-burner project just got my attention when I found out
>that Home Depot sells magnetic paint.
>
Interesting! What is it called, and is there a web reference?
Jim Stewart
> A long-term back-burner project just got my attention when I found out
> that Home Depot sells magnetic paint.
>
> The project is a levitating globe thingie, designed as a control systems
> trainer that lets the student program the control rules in C and see how
> different control strategies lead to different sorts of system
> performance.
>
> The paint got me thinking -- if they can make latex paint with iron
> powder in it, can I buy some sort of plastic resin with iron powder in it
> and make my own custom magnetics on the cheap?
>
> So: does anyone know of an iron-powder/epoxy (or whatever) mix out there
> that you can buy, or an iron powder material that you can mix with your
> own resin to mold soft magnetic materials out of?
Don't know about the power, but I've used these
people for sample cores. Fast service and good
product. They might be able to find you some
powder.
Tim Wescott
Searching on "magnetic paint" on the Home Depot or Rust-Oleum sites
should get you there.
jeff
There are a lot of iron filled epoxies out there. Two names that come to
mind immediately are Moglice and Devcon. I recall Dave Trumper at MIT
had a nice mag-lev demo that used a photocell as feedback.
--
Jeff Lowe
whit3rd
> A long-term back-burner project just got my attention when I found out
> that Home Depot sells magnetic paint.
>
> powder in it, can I buy some sort of plastic resin with iron powder in it
> and make my own custom magnetics on the cheap?
Firstly, why do you think it's an iron-powder paint? Nickel, cobalt,
hematite, are all ferromagnetic (and both hematite and some kinds of
nickel are used in paint).
Secondly, if you want custom magnetics on the cheap, you can get
soft iron wire and make toroids quite easily; no powders required.
Small cores, untwist a coathanger. Large cores, soft iron wire from
building-supply places is reasonably priced (five pound rolls
are common, for the ferroconcrete trades).
It isn't terribly practical to make magnetic parts from low-density
mixes
of slightly magnetizable particles in a plastic matrix, because the
size of the core gets larger, then you need more wire, which has to be
thicker, so the aperture has to be larger, then the core has to be
larger... And, if you COULD make it work, the plastic core would
age and change values more than a solid slab of iron or a sintered
bunch of powder or a milled/fired ceramic. It'd also be more likely
to catch fire or outgas toxins than the 'standard' cores.
There's uses for magnetic paint, though; like conductive paint, it
blocks EM radiation. You could, theoretically, paint the right kind
of bullseye pattern on your house siding over the primer, and under
the finish coat, to make a kind of hologram mirror (stealthy satellite
dish
construction, the homeowner's association will never know).
Parenthetically, common hematite-based black paints aren't ALL
ferromagnetic;
the particle size in the pigment is critical, very small particles
don't
hold a magnetization like a large crystal of the pure material would.
Martin Brown
> A long-term back-burner project just got my attention when I found out
> that Home Depot sells magnetic paint.
>
> The project is a levitating globe thingie, designed as a control systems
> trainer that lets the student program the control rules in C and see how
> different control strategies lead to different sorts of system
> performance.
How about a ping-pong ball into a chemical silvering mirror solution and
then electroplate iron onto it in a simple ferrous plating bath?
>
> The paint got me thinking -- if they can make latex paint with iron
> powder in it, can I buy some sort of plastic resin with iron powder in it
> and make my own custom magnetics on the cheap?
Yes. Although the raw material when dry requires a bit of careful
handling preferably in an inert atmosphere. Finely divided iron powder
intended for magnetic crack detection is usually supplied as a
suspension mixed in kerosene. In the air as a dust it can be pyrophoric.
It is fun to paint some on a magnetic card strip you no longer need.
>
> So: does anyone know of an iron-powder/epoxy (or whatever) mix out there
> that you can buy, or an iron powder material that you can mix with your
> own resin to mold soft magnetic materials out of?
>
> I'm looking to build some cores, and maybe have some made at a low volume
> if the prototypes work. I do _not_ need super high permeability -- the
> air gap in this is so big that according to the FEA program I'm using
> there's not much difference between core material with a relative
> permeability in the hundreds vs. iron (with relative permeability in the
> thousands).
You might be better off with finely ground magnetite. That is easier to
handle and doesn't go woof. This stuff is in vogue these days for fancy
magnetoresponsive goops in various esoteric devices. You can make it do
some of the T2 type flow then rigid things with a bit of effort - except
it is dirty black gunge and gets everywhere instead of a nice mirror
finish like in the movie... and a bit fanciful in some articles by the
proponents of the technology. eg
http://science.howstuffworks.com/liquid-body-armor2.htm
Someone like Alfa or an NDT specialist supplier will sell you the stuff
but whether you will think the price is reasonable is harder to answer.
Regards,
Martin Brown
Tim Wescott
> Hi Tim,
> There are a lot of iron filled epoxies out there. Two names that come to
> mind immediately are Moglice and Devcon. I recall Dave Trumper at MIT
> had a nice mag-lev demo that used a photocell as feedback.
Thanks Jeff. That gave me the keywords I needed.
Goodness but it's expensive stuff, at least from McMaster. Gotta think
about this again, maybe.
Tim Wescott
> On Nov 23, 10:41 am, Tim Wescott <t...@seemywebsite.com> wrote:
>> A long-term back-burner project just got my attention when I found out
>> that Home Depot sells magnetic paint.
>>
>> The paint got me thinking -- if they can make latex paint with iron
>> powder in it, can I buy some sort of plastic resin with iron powder in
>> it and make my own custom magnetics on the cheap?
>
> Firstly, why do you think it's an iron-powder paint? Nickel, cobalt,
> hematite, are all ferromagnetic (and both hematite and some kinds of
> nickel are used in paint).
I assumed, but yes it could be some other magnetic material.
>
> Secondly, if you want custom magnetics on the cheap, you can get soft
> iron wire and make toroids quite easily; no powders required. Small
> cores, untwist a coathanger. Large cores, soft iron wire from
> building-supply places is reasonably priced (five pound rolls are
> common, for the ferroconcrete trades).
I considered that, but for the shapes I want it'd be hard to get what I
wanted without considerable hand work.
> It isn't terribly practical to make magnetic parts from low-density
> mixes
> of slightly magnetizable particles in a plastic matrix, because the size
> of the core gets larger, then you need more wire, which has to be
> thicker, so the aperture has to be larger, then the core has to be
> larger... And, if you COULD make it work, the plastic core would age
> and change values more than a solid slab of iron or a sintered bunch of
> powder or a milled/fired ceramic. It'd also be more likely to catch
> fire or outgas toxins than the 'standard' cores.
I distinctly said that my air gaps are huge, and furthermore that I
checked this with a FEA program that shows I don't need huge
permeabilities. I also said that specific values aren't critical. Are
you saying that of all the iron-powder-in-plastic materials that you're
personally familiar with there's none with relative permeabilities in the
mid 100's?
If you could give me a list of the brands that you're familiar with I'll
go check specifications myself, thanks.
> There's uses for magnetic paint, though; like conductive paint, it
> blocks EM radiation. You could, theoretically, paint the right kind of
> bullseye pattern on your house siding over the primer, and under the
> finish coat, to make a kind of hologram mirror (stealthy satellite dish
> construction, the homeowner's association will never know).
>
> Parenthetically, common hematite-based black paints aren't ALL
> ferromagnetic;
> the particle size in the pigment is critical, very small particles don't
> hold a magnetization like a large crystal of the pure material would.
Jerry Avins
It's either soft iron, or it needs a strong field to polarize it. How is
it used? (IIRC, the permeability of ceramic magnets id low, so they
support large gaps too.)
Jerry
--
Engineering is the art of making what you want from things you can get.
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Jerry Avins
> Tim Wescott wrote:
>> On Mon, 23 Nov 2009 13:55:37 -0500, PeterD wrote:
>>
>>> On Mon, 23 Nov 2009 12:41:46 -0600, Tim Wescott <t...@seemywebsite.com>
>>> wrote:
>>>
>>>> A long-term back-burner project just got my attention when I found out
>>>> that Home Depot sells magnetic paint.
>>>>
>>>>
>>> Interesting! What is it called, and is there a web reference?
>>
>> Searching on "magnetic paint" on the Home Depot or Rust-Oleum sites
>> should get you there.
>
> It's either soft iron, or it needs a strong field to polarize it. How is
> it used? (IIRC, the permeability of ceramic magnets id low, so they
> support large gaps too.)
From what I found searching, it's soft. that is, magnets are attracted
to it, but it's not attractive on its own.
Tim Wescott
> Jerry Avins wrote:
>> Tim Wescott wrote:
>>> On Mon, 23 Nov 2009 13:55:37 -0500, PeterD wrote:
>>>
>>>> On Mon, 23 Nov 2009 12:41:46 -0600, Tim Wescott
>>>> <t...@seemywebsite.com> wrote:
>>>>
>>>>> A long-term back-burner project just got my attention when I found
>>>>> out that Home Depot sells magnetic paint.
>>>>>
>>>>>
>>>> Interesting! What is it called, and is there a web reference?
>>>
>>> Searching on "magnetic paint" on the Home Depot or Rust-Oleum sites
>>> should get you there.
>>
>> It's either soft iron, or it needs a strong field to polarize it. How
>> is it used? (IIRC, the permeability of ceramic magnets id low, so they
>> support large gaps too.)
>
> From what I found searching, it's soft. that is, magnets are attracted
> to it, but it's not attractive on its own.
>
> Jerry
Right. I'm looking for an armature material for an oddball electromagnet
-- big, light (well, relatively), and capable of supporting a significant
AC component without wasting it all as heat.
PeterD
wrote:
>On Mon, 23 Nov 2009 13:55:37 -0500, PeterD wrote:
>
>> On Mon, 23 Nov 2009 12:41:46 -0600, Tim Wescott <t...@seemywebsite.com>
>> wrote:
>>
>>>A long-term back-burner project just got my attention when I found out
>>>that Home Depot sells magnetic paint.
>>>
>>>
>> Interesting! What is it called, and is there a web reference?
>
>Searching on "magnetic paint" on the Home Depot or Rust-Oleum sites
>should get you there.
http://www.rustoleum.com/CBGProduct.asp?pid=127, nothing came up with
the suggested search terms however.
Glen Walpert
wrote:
>> On Nov 23, 10:41 am, Tim Wescott <t...@seemywebsite.com> wrote:
>>> A long-term back-burner project just got my attention when I found out
>>> that Home Depot sells magnetic paint.
>>>
>>> The paint got me thinking -- if they can make latex paint with iron
>>> powder in it, can I buy some sort of plastic resin with iron powder in
>>> it and make my own custom magnetics on the cheap?
Devcon A is the original epoxy filled with a high percentage of
"steel" of some sort. It was around in the 60's and is still
available:
http://www.freemansupply.com/PlasticSteelPuttyD.htm - first source
googled, I never used them.
There are now others, turned up with search on "iron filled epoxy":
http://www.freemansupply.com/IronFilledEpoxyCas.htm
None of which discuss magnetic properties, but you could try calling
the mfgrs.
Michael A. Terrell
Tim Wescott wrote:
>
> If you could give me a list of the brands that you're familiar with I'll
> go check specifications myself, thanks.
http://jbweld.net/products/jbweld.php lists 'liquid steel' as one part
of their epoxy. Who knows what they mean?
--
The movie 'Deliverance' isn't a documentary!
Gerhard Hoffmann
>The paint got me thinking -- if they can make latex paint with iron
>powder in it, can I buy some sort of plastic resin with iron powder in it
>and make my own custom magnetics on the cheap?
>
>So: does anyone know of an iron-powder/epoxy (or whatever) mix out there
>that you can buy, or an iron powder material that you can mix with your
>own resin to mold soft magnetic materials out of?
Some years ago, we were designing bias tees for 10 GB/s laser transceivers
and stumbled across those conical coils made by Piconics. A colleage
of mine was so delighted that he wouldn't wait for samples and decided
to build a few over the weekend. On monday he showed up with some coils
that looked _ugly_ but the bias tee was flat to 20 GHz.
He never told us how he did it exactly, but I think he ground some
cores in a mortar and added epoxy glue.
We finally found a combination of cheap 0402 devices that
worked nicely, too.
regards, Gerhard
Charlie E.
wrote:
>>
>There's uses for magnetic paint, though; like conductive paint, it
>blocks EM radiation. You could, theoretically, paint the right kind
>of bullseye pattern on your house siding over the primer, and under
>the finish coat, to make a kind of hologram mirror (stealthy satellite
>dish
>construction, the homeowner's association will never know).
>
Reminds me of a friend, who decided to do his own roofing so that he
could make sure that the spacing of the nails would not interfere with
the satellite dish in the attic. He had the truss designed specially
too, to give him the room and metal free window to the south...
Charlie
Adrian Jansen
ratio of total gap to total path through the magnetic material, where
the total gap includes all the gaps between the magnetic particles, you
quickly see that the overall permeability of any practical mix of
magnetic particles and plastic is going to have a permeability of around
10-20 at most, rather than 100.
--
Regards,
Adrian Jansen adrianjansen at internode dot on dot net
Note reply address is invalid, convert address above to machine form.
Tim Wescott
whit3rd
Err... but packing of spheres yields packing fractions of 0.523 and
up, and
the 'gap' fraction would be the cube root of that, 0.803 and up. This
isn't a killer effect.
You should be able to get fine iron shot (used in some toner
cartridges)
which isn't a bad fire hazard, and mix into Bondo (auto body putty,
known
to be compatible with/bond to iron) and form some shapes easily
enough.
Rich Grise
Find a shop where they do welding and grinding and torch cutting, and drag
a magnet across the floor. (or dip a magnet into the sweepers' crud pile). ;-)
For best results, put the magnet (uWave maggie magnets work pretty good)
in a plastic bag, and retrive the shavings ("iron filings") by turning
the plastic bag inside-out.
The slag from torch-cutting is magnetic - I
think it's ferrous oxide (FeO).
Then, just mix it up with some not-too-viscous epoxy, and press it into
your form.
Good Luck!
Rich
Adrian Jansen
Let Effective permeability = ue
Material permeability = u
Total length = le, the total length of the magnetic circuit
Gap length = lg, the length of the non magnetic part
Then
ue = u * le / (le + lg * (u-1))
For packing fraction of 0.8, you can say
le = 1
lg = 0.2
u = 10000 ( say for iron )
ue = 5 approx
See the problem ?
whit3rd
> whit3rd wro
> > Err... but packing of spheres yields packing fractions of 0.523 and
> > up, and
> > the 'gap' fraction would be the cube root of that, 0.803 and up. This
> > isn't a killer effect.
> ue = u * le / (le + lg * (u-1))
>
> For packing fraction of 0.8, you can say
...
> ue = 5 approx
OK, I get it now. There's much higher gap sensitivity because of
the multiplier of the 'u-1' factor. It also implies that my 'average'
(arithmetic mean) on the gap is wrong, there's much more flux
at the near-contact points than predicted, so we might expect
anywhere from ue=20 to maybe ue=150.
Hotpressing of iron powder would increase the contact area
significantly, which is why powdered-iron cores work well; that
wouldn't be available in the field doing onesies, because of
the powdered-iron-burns-and-oxidizes problem.
Rich Grise
If you're desperate, you could fab some kind of shroud around your press,
and flood it with nitrogen or argon or maybe SF6...
Cheers!
Rich
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1- Islam has given thorough details of the concept of Allah "God",
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**Allâh-us-Samad (The Self-Sufficient Master, Whom all creatures need,
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**.He begets not, nor was He begotten;
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him).The Prophet (peace and blessings of Allah be upon him) said:
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is not a part of it will have it rejected
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Gunner Asch
<imanw...@gmail.com> wrote:
>
>I would be thankful if you give my article 5 minute of your value
>time.
Fuck you.
<plink>
Gunner
"Aren't cats Libertarian? They just want to be left alone.
I think our dog is a Democrat, as he is always looking for a handout"
Unknown Usnet Poster
Heh, heh, I'm pretty sure my dog is a liberal - he has no balls.
Keyton
Jon Kirwan
wrote:
>On Mon, 23 Nov 2009 14:52:16 -0500, jeff wrote:
Might try picking these up, too:
http://dspace.mit.edu/bitstream/handle/1721.1/13582/24130470.pdf?sequence=1
http://dspace.mit.edu/bitstream/handle/1721.1/29730/54039899.pdf?sequence=1
PDF files worth reading. (Found them using David's name, above.)
Jon
Bill McKee
"Jon Kirwan" <jo...@infinitefactors.org> wrote in message
news:8036h5lo6s9o5mo69...@4ax.com...
Look for sintered metal in a magnetic material. I think some magnets are
made with sintered iron.
Gunner Asch
I wish this had come up 5 months ago, when I was taking down Ceromet/MPP
in Anaheim, California.
I could have gotten you guys a few thousand pounds of iron powder for
free.
http://metalpowderproducts.com/
If you want a few pounds..maybe I can get it from another company if I
ask nice and they want a service call.....
http://www.capstan.cc/locs-cal.htm
Richard the Dreaded Libertarian
>
> "Aren't cats Libertarian? ..."
Hell, NO! They're clearly liberals. They lollygag around the house
expecting their human servants to deliver pre-chewed food to their face
and schlep away their shit, while they mutilate the furniture, piss all
over everything, and sneer at you.
Hope This Helps!
Rich
Gunner Asch
:LOL..
Ill have to change that sig..you make sense.
Richard the Dreaded Libertarian
> On Mon, 30 Nov 2009 09:48:19 -0800, Richard the Dreaded Libertarian
> Ill have to change that sig..you make sense.
>
> Gunner
>
> "Aren't cats Libertarian? They just want to be left alone. I think our dog
Um, better hurry up! ;-)
Cheers!
Rich
pyotr filipivich
about Mon, 30 Nov 2009 22:09:40 -0800 did write/type or cause to
appear in rec.crafts.metalworking the following:
>On Mon, 30 Nov 2009 09:48:19 -0800, Richard the Dreaded Libertarian
><freed...@example.net> wrote:
>>On Sun, 29 Nov 2009 13:57:42 -0800, Gunner Asch wrote:
>>>
>>> "Aren't cats Libertarian? ..."
>>
>>Hell, NO! They're clearly liberals. They lollygag around the house
>>expecting their human servants to deliver pre-chewed food to their face
>>and schlep away their shit, while they mutilate the furniture, piss all
>>over everything, and sneer at you.
>>
>>Hope This Helps!
>>Rich
>
>
>:LOL..
>
>Ill have to change that sig..you make sense.
Cat's aren't liberals. Cats just recall when they worshipped as
gods. Which they still believe was only right and proper.
I'd say today, they're more absolute monarchists. And the only
ones who matter are other members of the aristocracy.
But I still like the fuzz balls.
-
pyotr filipivich
We will drink no whiskey before its nine.
It's eight fifty eight. Close enough!
Gunner Asch
As do I.
So the sig stays!
Gunner, with Fughead the kitten, curled up in his lap.
>pyotr filipivich
>We will drink no whiskey before its nine.
>It's eight fifty eight. Close enough!
"Aren't cats Libertarian? They just want to be left alone.
Wild_Bill
powders available for various uses, from toys (Etch-A-Sketch), to industrial
uses.. electromagnetic clutches/brakes for machines.
These examples are moderately coarse powders.
Very fine iron/steel particles are a byproduct of etching/cleaning or
pickling steel products in manufacturing. The steel parts are pickled in
various acids, and the particles which are suspended in the liquids are then
filtered to remove the particles from the acids. The result is a
mud/clay-like material that is used to manufacture other products, including
iron composition cores for certain magnetic properties.
I don't have any sources to recommend.
--
WB
.........
metalworking projects
www.kwagmire.com/metal_proj.html
"Tim Wescott" <t...@seemywebsite.com> wrote in message
news:hbmdnfVvIcn3SpfW...@web-ster.com...
>A long-term back-burner project just got my attention when I found out
> that Home Depot sells magnetic paint.
>
> The project is a levitating globe thingie, designed as a control systems
> trainer that lets the student program the control rules in C and see how
> different control strategies lead to different sorts of system
> performance.
>
> The paint got me thinking -- if they can make latex paint with iron
> powder in it, can I buy some sort of plastic resin with iron powder in it
> and make my own custom magnetics on the cheap?
>
> So: does anyone know of an iron-powder/epoxy (or whatever) mix out there
> that you can buy, or an iron powder material that you can mix with your
> own resin to mold soft magnetic materials out of?
>
> I'm looking to build some cores, and maybe have some made at a low volume
> if the prototypes work. I do _not_ need super high permeability -- the
> air gap in this is so big that according to the FEA program I'm using
> there's not much difference between core material with a relative
> permeability in the hundreds vs. iron (with relative permeability in the
> thousands).
>
> Thanks.
>
> --
> www.wescottdesign.com
Joseph Gwinn
"Wild_Bill" <wb_wi...@XSPAMyahoo.com> wrote:
> I dunno about the ability to meet your requirements, but there are iron
> powders available for various uses, from toys (Etch-A-Sketch), to industrial
> uses.. electromagnetic clutches/brakes for machines.
> These examples are moderately coarse powders.
>
> Very fine iron/steel particles are a byproduct of etching/cleaning or
> pickling steel products in manufacturing. The steel parts are pickled in
> various acids, and the particles which are suspended in the liquids are then
> filtered to remove the particles from the acids. The result is a
> mud/clay-like material that is used to manufacture other products, including
> iron composition cores for certain magnetic properties.
>
> I don't have any sources to recommend.
The finest iron powders are called "carbonyl iron"
(http://en.wikipedia.org/wiki/Carbonyl_iron).
Googling for carbonyl iron brought up this supplier:
<http://www.chemicalstore.com/navigation/detail.asp?id=IRON100>.
Joe Gwinn
steamer
Bathsheba's process description yet?
http://www.bathsheba.com/sculpt/process/
--
"Steamboat Ed" Haas : Currently broke and
Hacking the Trailing Edge! : looking for a job...
www.nmpproducts.com
---Decks a-wash in a sea of words---
axolotl
> I dunno about the ability to meet your requirements, but there are iron
> powders available for various uses, from toys (Etch-A-Sketch), to
> industrial uses.. electromagnetic clutches/brakes for machines.
> These examples are moderately coarse powders.
>
> Very fine iron/steel particles are a byproduct of etching/cleaning or
> pickling steel products in manufacturing. The steel parts are pickled in
> various acids, and the particles which are suspended in the liquids are
> then filtered to remove the particles from the acids. The result is a
> mud/clay-like material that is used to manufacture other products,
> including iron composition cores for certain magnetic properties.
>
> I don't have any sources to recommend.
>
Many years ago, the ferrite factory for which I worked used oxide from
the steel mills as a raw material. I was told there were mountains of
the stuff in West Virginia.
To be usable for magnetics, the oxide would have to be fired in a cycle
that included high temperatures and witchcraft.
Kevin Gallimore
Martin H. Eastburn
slowly towards an end - moving impurities with it.
Expensive refining but quality product.
Similar to that of a semiconductor process.
Likely from the ferrite business.
Martin
amark
> A long-term back-burner project just got my attention when I found out
> that Home Depot sells magnetic paint.
>
> The project is a levitating globe thingie, designed as a control systems
> trainer that lets the student program the control rules in C and see how
> different control strategies lead to different sorts of system
> performance.
>
> The paint got me thinking -- if they can make latex paint with iron
> powder in it, can I buy some sort of plastic resin with iron powder in it
> and make my own custom magnetics on the cheap?
>
> So: does anyone know of an iron-powder/epoxy (or whatever) mix out there
> that you can buy, or an iron powder material that you can mix with your
> own resin to mold soft magnetic materials out of?
>
> I'm looking to build some cores, and maybe have some made at a low volume
> if the prototypes work. I do _not_ need super high permeability -- the
> air gap in this is so big that according to the FEA program I'm using
> there's not much difference between core material with a relative
> permeability in the hundreds vs. iron (with relative permeability in the
> thousands).
>
> Thanks.
>
> --www.wescottdesign.com
and a further reply - iron powders are used in spray-metal
applications but at a price
Tony
reverse the process - make up an arbitrarily complex winding on a simple bobbin, then wind
the iron onto the copper "toroid" (all in a single pass of course).
Tony
Jerry Avins
Why enameled? The black oxide on soft-annealed iron wire is usually
sufficient insulation to suppress eddy currents.
Jerry
--
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������
Jerry Avins
> Tony wrote:
>> I've often wished that someone would make enameled soft iron "winding"
>> wire. Then I could
>> reverse the process - make up an arbitrarily complex winding on a
>> simple bobbin, then wind
>> the iron onto the copper "toroid" (all in a single pass of course).
>> Tony
>
> Why enameled? The black oxide on soft-annealed iron wire is usually
> sufficient insulation to suppress eddy currents.
Annealed oxide-coated iron wire is used by jewelers to hold assemblies
together for soldering. Solder won't flow on it.
https://eclient.ijsinc.com/eshop/default.aspx