FPGA Central

A friend of mine says his hands get sore after a few hours of working
with very strong rare-earth magnets.
Does this sound right? Can magnetic fields do us harm?

Hardy

On Apr 5, 8:16*pm, HardySpicer <gyansor...@gmail.com> wrote:
> A friend of mine says his hands get sore after a few hours of working
> with very strong rare-earth magnets.
> Does this sound right? Can magnetic fields do us harm?
>
> Hardy

If you get your finger caught between two strong magnets, they can
hurt you.

Magnets are a hard cold metal object. Just handling such things can
do you are if you are pounding your hand with them. The fact that
they may be cold may make some peoples hands hurt.

On Apr 5, 7:16*pm, HardySpicer <gyansor...@gmail.com> wrote:
> A friend of mine says his hands get sore after a few hours of working
> with very strong rare-earth magnets.
> Does this sound right? Can magnetic fields do us harm?
>
> Hardy

Everyone who gets in an MRI will die eventually.

HardySpicer wrote:
> A friend of mine says his hands get sore after a few hours of working
> with very strong rare-earth magnets.
> Does this sound right? Can magnetic fields do us harm?
>
> Hardy

Shelling corn be hand have the same effect.

"MooseFET" <[email protected]> wrote in message
news:[email protected]...
On Apr 5, 8:16 pm, HardySpicer <gyansor...@gmail.com> wrote:
> A friend of mine says his hands get sore after a few hours of working
> with very strong rare-earth magnets.
> Does this sound right? Can magnetic fields do us harm?
>
> Hardy

If you get your finger caught between two strong magnets, they can
hurt you.

Magnets are a hard cold metal object. Just handling such things can
do you are if you are pounding your hand with them. The fact that
they may be cold may make some peoples hands hurt.




They (rare earth magnets) also cause major problems if children swallow
them - particularly if they swallow more than one. The magnets can stick to
one another with bits of gut tissue trapped in between them.

Sam Wormley wrote:
> HardySpicer wrote:
>> A friend of mine says his hands get sore after a few hours of working
>> with very strong rare-earth magnets.
>> Does this sound right? Can magnetic fields do us harm?
>>
>> Hardy
>
> Shelling corn be hand have the same effect.
>
How hard are corn shells ??

don

don wrote:
> Sam Wormley wrote:
>> HardySpicer wrote:
>>> A friend of mine says his hands get sore after a few hours of working
>>> with very strong rare-earth magnets.
>>> Does this sound right? Can magnetic fields do us harm?
>>>
>>> Hardy
>>
>> Shelling corn be hand have the same effect.
>>
> How hard are corn shells ??
>
> don

You should try it and find out!

HardySpicer wrote:

> A friend of mine says his hands get sore after a few hours of working
> with very strong rare-earth magnets.
> Does this sound right? Can magnetic fields do us harm?
>
> Hardy
???only if you find magents to be attractive???

HardySpicer wrote:
> A friend of mine says his hands get sore after a few hours of working
> with very strong rare-earth magnets.
> Does this sound right? Can magnetic fields do us harm?

Do you mean can really strong magnetic files rip electrons off of atoms?


>
> Hardy

On Apr 6, 6:16*pm, Sam Wormley <sworml...@mchsi.com> wrote:
> HardySpicer wrote:
> > A friend of mine says his hands get sore after a few hours of working
> > with very strong rare-earth magnets.
> > Does this sound right? Can magnetic fields do us harm?
>
> * *Do you mean can really strong magnetic files rip electrons off of atoms?
>
>
>
> > Hardy

I mean can it have an effect on say the iron in your blood?

On 04/05/2009 08:16 PM, HardySpicer sent:
> A friend of mine says his hands get sore after a few hours of working
> with very strong rare-earth magnets.
> Does this sound right? Can magnetic fields do us harm?
>
> Hardy

Hello Hardy:

At least one well known U.S. national laboratory ES&H department,
establishes an /approximate/ eight hour maximum exposure if subjected to
60 mT (milli-Tesla). 60 mT = 600 G (Gauss).

However, I believe the effects of continued exposure *may* not be
clearly known yet.

Your friend, of course, should not have any implanted medical devices.

If magnetic field measurement equipment is immediately available, what
is the maximum strength of these typical magnets in question?

Best wishes,

Pete
--
1PW @?6A62?FEH9E=6o2@=]4@> [r4o7t]

On Sun, 5 Apr 2009 20:16:24 -0700 (PDT), HardySpicer
<[email protected]> wrote:

>A friend of mine says his hands get sore after a few hours of working
>with very strong rare-earth magnets.
>Does this sound right? Can magnetic fields do us harm?

Maybe the plating on the magnets contains a metal that he is allergic
to? Nickel, perhaps?
--
RoRo

HardySpicer wrote:
> On Apr 6, 6:16 pm, Sam Wormley <sworml...@mchsi.com> wrote:
>
>>HardySpicer wrote:
>>
>>>A friend of mine says his hands get sore after a few hours of working
>>>with very strong rare-earth magnets.
>>>Does this sound right? Can magnetic fields do us harm?
>>
>> Do you mean can really strong magnetic files rip electrons off of atoms?

>
> I mean can it have an effect on say the iron in your blood?

How about Hall or MHD effects in the body fluids, or just inducing the
currents in the moving parts?



Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com

On Apr 5, 11:16*pm, HardySpicer <gyansor...@gmail.com> wrote:
> A friend of mine says his hands get sore after a few hours of working
> with very strong rare-earth magnets.
> Does this sound right? Can magnetic fields do us harm?
>
> Hardy

If you have a small metal sliver in your eye (type attracted to
magnets) from metal working, and you take an MRI test it can do you a
lot of harm.

HardySpicer wrote:
> A friend of mine says his hands get sore after a few hours of working
> with very strong rare-earth magnets.
> Does this sound right? Can magnetic fields do us harm?

According to http://tinyurl.com/46frwo, cell phones are a problem too.
Isn't it remarkable they radiate strongly when receiving, right on an
absorption band!

Jerry
--
Engineering is the art of making what you want from things you can get.
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

On Apr 5, 11:16 pm, HardySpicer <gyansor...@gmail.com> wrote:
> A friend of mine says his hands get sore after a few hours of working
> with very strong rare-earth magnets.
> Does this sound right? Can magnetic fields do us harm?
>
> Hardy

Only proper nutrition and exercise can effect health. There is a
difference between effect and affect.

HardySpicer wrote:
> On Apr 6, 6:16 pm, Sam Wormley <sworml...@mchsi.com> wrote:
>> HardySpicer wrote:
>>> A friend of mine says his hands get sore after a few hours of working
>>> with very strong rare-earth magnets.
>>> Does this sound right? Can magnetic fields do us harm?
>> Do you mean can really strong magnetic files rip electrons off of atoms?
>>
>>
>>
>>> Hardy
>
> I mean can it have an effect on say the iron in your blood?

Yes, it can. Erythrocytes (red blood cells), like magnetic bacteria,
have a net magnetic moment in an external applied field. Strong
magnetic fields cause your red blood cells to line up with their long
axis along the field. This would be OK except that the finest
capillaries are too small for red blood cells to go through sideways, so
it reduces circulation quite seriously.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net

On Mon, 6 Apr 2009 07:05:06 -0700 (PDT), [email protected]
wrote:

>On Apr 5, 11:16 pm, HardySpicer <gyansor...@gmail.com> wrote:
>> A friend of mine says his hands get sore after a few hours of working
>> with very strong rare-earth magnets.
>> Does this sound right? Can magnetic fields do us harm?
>>
>> Hardy
>
>Only proper nutrition and exercise can effect health. There is a
>difference between effect and affect.

http://xkcd.com/326/

On Apr 5, 10:16*pm, HardySpicer <gyansor...@gmail.com> wrote:
> A friend of mine says his hands get sore after a few hours of working
> with very strong rare-earth magnets.
> Does this sound right? Can magnetic fields do us harm?
>
> Hardy

I don't think anyone really knows the answer to this.
Folks have pooh-poohed cellular effects of low-power electromagnetic
waves for a long time, but it turns out that new treatments for brain
signal disorders (like Parkinson's) involve levels of low-power EM
radiation are showing significant positive results despite "not being
able to".
Likewise, magnetic bracelets and shoe inserts have been on the fringe-
appeal market for a long time, encouraging derision from both
physiologists and physicists. Recently, however, some repeatable
studies have shown enhanced immune response and circulation in regions
where there is a strong applied magnetic field.

On 6 Apr, 05:16, HardySpicer <gyansor...@gmail.com> wrote:
> A friend of mine says his hands get sore after a few hours of working
> with very strong rare-earth magnets.
> Does this sound right? Can magnetic fields do us harm?

Not the magnetic field, but I wouldn't be surprised
if secondary or ternary effects might cause some
discomfort. Don't know if you remember the CRT
monitors on computers ages ago? The radiation
escaping from the tubes ionized the dust in the air,
which caused the dust to interact strongly with the
moist in eyes and on skin, which in turn caused
discomfort for users who spent long time in front
of the terminals.

Look in the environment where you friend works
for dust or other agents that are affected by the
magnetic field. If such exist - not too likely, as
few non-metallic agents are magnetic - it might
be that they interact with the sensory system on
the skin in such a way that your friend experiences
discomfort. However, I suspect that those sorts of
things would be far more likely in the presence
of *electric*, not magnetic, fields.

Nah, ordinary fatigue, possibly combined with some
nocebo, is the most likely explanation. Like people
complaining about heating at the ears when they
talk in mobile phones for long periods of time: The
mere act of holding any object to your ear prevents
body heat from escaping, thus causing the ear to
heat up. Of course, trivial explanations don't matter
once people get 'the shivers' about something,
particularly 'radiation' or 'fields'.

Rune

On Apr 6, 8:56 am, Vladimir Vassilevsky <antispam_bo...@hotmail.com>
wrote:

> > I mean can it have an effect on say the iron in your blood?
>
> How about Hall or MHD effects in the body fluids, or just inducing the
> currents in the moving parts?
>
> Vladimir Vassilevsky
> DSP and Mixed Signal Design Consultanthttp://www.abvolt.com

We Wish! As is usual with humans, a few people are rather sensitive
to magnetic fields, but I've never heard of the sensitivity going
beyond just noticing it or being a bit uncomfortable. But who knows
what long-term exposure could do? Maybe nothing, maybe more. Pretty
hard to test. A number of medical problems could be made a lot
simpler if the body readily responded to magnetic fields of some type,
but all experiments I've seen seem to show that the body is amazingly
insensitive to ether DC or variable magnetic fields even when quite
strong.

Hence when you get an MRI you actually don't die nor scream hideously
as the magnetic fields penetrate your body...
(in fact, when I had one I was rather hoping I'd detect perhaps some
"sounds" being generated in the brain or ears, but while the high
field modulation coils are noisy sound-wise, I could detect no such
direct field action from them on the body).

On Mon, 06 Apr 2009 13:21:43 +0800, Nutz wrote:
> "MooseFET" <[email protected]> wrote in message
> On Apr 5, 8:16 pm, HardySpicer <gyansor...@gmail.com> wrote:
>> A friend of mine says his hands get sore after a few hours of working
>> with very strong rare-earth magnets.
>> Does this sound right? Can magnetic fields do us harm?
>
> If you get your finger caught between two strong magnets, they can
> hurt you.
>
> Magnets are a hard cold metal object. Just handling such things can
> do you are if you are pounding your hand with them. The fact that
> they may be cold may make some peoples hands hurt.
>
> They (rare earth magnets) also cause major problems if children swallow
> them - particularly if they swallow more than one. The magnets can stick to
> one another with bits of gut tissue trapped in between them.

You're supposed to house-train your children.

Cheers!
Rich

In article <[email protected]> , Phil Hobbs wrote:
>HardySpicer wrote:

<SNIP>

>> I mean can it have an effect on say the iron in your blood?
>
>Yes, it can. Erythrocytes (red blood cells), like magnetic bacteria,
>have a net magnetic moment in an external applied field. Strong
>magnetic fields cause your red blood cells to line up with their long
>axis along the field. This would be OK except that the finest
>capillaries are too small for red blood cells to go through sideways, so
> it reduces circulation quite seriously.

Human red blood cells are circular.

Hemoglobin has little paramagnetism and no ferromagnetism, and in fact
when oxygenated it is strangely slightly diamagnetic, to the same extent
as tissue.

- Don Klipstein ([email protected])

"Don Klipstein" <[email protected]> wrote in message
news:[email protected]..
> In article <[email protected]> , Phil Hobbs
> wrote:
>>HardySpicer wrote:
>
> <SNIP>

Oh, ok then, if I must. Pity, you may have written something interesting...
Anything else you want snipped?

On Apr 7, 9:01*am, "Androcles" <Headmas...@Hogwarts.physics> wrote:
> "Don Klipstein" <d...@manx.misty.com> wrote in message
>
> news:[email protected]..
>
> > In article <kaadnfQRtZ6nkEfUnZ2dnUVZ_h6Wn...@supernews.com> , Phil Hobbs
> > wrote:
> >>HardySpicer wrote:
>
> > <SNIP>
>
> Oh, ok then, if I must. Pity, you may have written something interesting....
> Anything else you want snipped?

All I have seen is a magnet that moves a filing cabinet - and this is
the small one!
Hold it for 15 mins and your hand gets sore (not from the weight).

Hardy