RE: [neonixie-l] Re: Take a look at this....

[Tidak Ada]

A nice place to store your harddiscs

eric

-Oorspronkelijk bericht-
Van: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] Namens 
Alic
Verzonden: zondag 14 augustus 2016 20:45
Aan: neonixie-l
Onderwerp: [neonixie-l] Re: Take a look at this

Yes, very impressive what you can do with magnets! There's also the float table 
:
http://rockpaperrobot.com
https://vimeo.com/51625557

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[neonixie-l] Re: Take a look at this....

[Alic]

Yes, very impressive what you can do with magnets! There's also the float table 
:
http://rockpaperrobot.com
https://vimeo.com/51625557

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Re: [neonixie-l] Re: Take a look at this....

[Dekatron42]

This fact was very interesting!

I bought a few different Neodymium magnets from Ebay when I experimented 
with the RYG10 as I didn't have a proper magnet, cheap ones from the Far 
East and they all became less magnetic in just a short time (some months). 
The Ferrite magnets I bought are still ok.

I thought that I had treated them poorly and also that my electromagnetic 
coil that I used to try to get a proper magnetic field had demagnetized 
them. Now when I check even the ones I didn't use the coil with are a lot 
weaker, so it must be poor magnets. I remember that a few cube like 
Neodymium magnets that we bought for experiments at work were a lot more 
expensive than the Far East models, so mine are probably either fake 
Neodymium magnets or of a poor manufacture.

I later used a Alnico magnet from a broken Burroughs BD-301, which works 
very well, as their magnets are stated as having almost the same magnetic 
flux as the ones that should be used for the RYG10.

Do you know how long the process of turning them into dust takes?

/Martin

On Sunday, 24 July 2016 06:31:52 UTC+2, A.J. Franzman wrote:
>
> Another degradation path I've seen too many times for NdFeB (Neodymium 
> "super magnets") is that they corrode and turn to powder, especially the 
> cheap ones from the Far East. The problem seems to be that the protective 
> plating applied is too thin to do any good.
>

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Re: [neonixie-l] Re: Take a look at this....

[A.J. Franzman]

Another degradation path I've seen too many times for NdFeB (Neodymium 
"super magnets") is that they corrode and turn to powder, especially the 
cheap ones from the Far East. The problem seems to be that the protective 
plating applied is too thin to do any good.

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Re: [neonixie-l] Re: Take a look at this....

[Instrument Resources of America]

Physical shock will also do them in!!  Ira.


On 7/23/2016 3:10 PM, gregebert wrote:
Permanent magnets will degrade (for lack of a better word) over time, 
and factors such as an opposing magnetic field will accelerate this. 
More details on physics forums, but it seems intuitive that external 
factors can disrupt the alignment of atoms thereby reducing the 
magnetic field.


I recall my kindergarten teacher told me to store my giant magnet with 
a steel bar across the poles, so it wouldn't lose it's strength.


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<>

[neonixie-l] Re: Take a look at this....

[gregebert]

Permanent magnets will degrade (for lack of a better word) over time, and 
factors such as an opposing magnetic field will accelerate this. More 
details on physics forums, but it seems intuitive that external factors can 
disrupt the alignment of atoms thereby reducing the magnetic field.

I recall my kindergarten teacher told me to store my giant magnet with a 
steel bar across the poles, so it wouldn't lose it's strength.

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[neonixie-l] Re: Take a look at this....

[Dekatron42]

Can anyone who has knowledge about magnets say what will happen to them 
over time, especially when they are near electromagnets transferring power, 
will they weaken and become unstable so the design will tilt or fall, and 
how long will it take to weaken the magnets?

/Martin

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Re: [neonixie-l] Re: Take a look at this....

[A.J. Franzman]

Correction, one can use diamagnetism (opposing ferromagnetism) to achieve 
stable, static magnetic levitation in a gravitational field. Paramagnetism 
is merely a weaker form of attraction, so it won't work. Diamagnetism is 
the opposite; diamagnetic materials weakly repel magnets rather than 
attract to them.

On Thursday, July 21, 2016 at 7:14:24 PM UTC-7, jrehwin wrote:
>
>
> Earnshaw's theorem actually states that it's impossible to use static 
> magnets to levitate no matter how you create the field without some 
> supporting surface touching the levitating surface at some position (like a 
> pole) which of course doesn't count as levitation. You have to use 
> active stabilisation with electromagnets.
>
>
> It can be done using paramagnetism, but the sweet spot is pretty small.
>
> - John
>
>

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Re: [neonixie-l] Re: Take a look at this....

[John Rehwinkel]

> Earnshaw's theorem actually states that it's impossible to use static magnets 
> to levitate no matter how you create the field without some supporting 
> surface touching the levitating surface at some position (like a pole) which 
> of course doesn't count as levitation. You have to use active stabilisation 
> with electromagnets.

It can be done using paramagnetism, but the sweet spot is pretty small.

- John

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[neonixie-l] Re: Take a look at this....

[ZY]

Earnshaw's theorem actually states that it's impossible to use static 
magnets to levitate no matter how you create the field without some 
supporting surface touching the levitating surface at some position (like a 
pole) which of course doesn't count as levitation. You have to use 
active stabilisation with electromagnets.

On Thursday, 21 July 2016 15:02:34 UTC-4, threeneurons wrote:
>
>
> Just as a clarification:
>
> 1) No power required for levitation
>

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[neonixie-l] Re: Take a look at this....

[gregebert]

...and if I had six of Dalibor's tube in a clock, I certainly wouldn't risk 
it floating-away and crashing onto the ground. I can imagine all sorts of 
scenarios where mag-lev can go wrong with an unrestrained object.

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[neonixie-l] Re: Take a look at this....

[Jeff Walton]

It's not an issue with Dalibor's tube.  It is beautiful!  I have no 
interest in a one digit clock.

On Thursday, July 21, 2016 at 1:51:08 PM UTC-5, Tony Adams wrote:
>
> Thanks for the comments everyone. A serious question though, would anyone 
> consider it worth adding an IN-8-2 option for example? I'd expected anyone 
> wanting a good looking nixie would have gone for Dalibor's tube but sadly 
> it hasn't been as popular as I'd hoped.
>

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Re: [neonixie-l] Re: Take a look at this....

[Jon Jackson]

I would be interested in an IN-8-2 option.

Jon

On Thu, Jul 21, 2016 at 12:51 PM, Tony Adams  wrote:

> Thanks for the comments everyone. A serious question though, would anyone
> consider it worth adding an IN-8-2 option for example? I'd expected anyone
> wanting a good looking nixie would have gone for Dalibor's tube but sadly
> it hasn't been as popular as I'd hoped.
>
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Re: [neonixie-l] Re: Take a look at this....

[Nicholas Stock]

That's a good thought...I'm sure our feline friends would find them
*fascinating*

On Thu, Jul 21, 2016 at 9:58 AM, Dekatron42 
wrote:

> I wonder how well it goes with cat owners, maybe you should use a glass
> dome to cover it so your cat doesn't start to play with it
>
> /Martin
>
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[neonixie-l] Re: Take a look at this....

[Nick]

Have a look at 4HV - lots of working projects on there including wireless power 
transfer using Royer oscillators - built one myself about 5 years ago when 
doing a lot if Tesla Coil stuff...

Nick

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Re: [neonixie-l] Re: Take a look at this....

[Michail1 via neonixie-l]

I don't think the issue is Dalibor's tube.
The issue is Single Tube vs 4 Tubes.
 
 
Yes, I like the IN-8-2 Option or the ability to change between the tubes  
(or simply easily replace tubes as needed).
 
Michail  Wilson
206-920-6312  

 
In a message dated 7/21/2016 11:51:10 A.M. Pacific Daylight Time,  
t...@lasermad.com writes:

Thanks for the comments everyone. A serious question though,  would anyone 
consider it worth adding an IN-8-2 option for example? I'd  expected anyone 
wanting a good looking nixie would have gone for Dalibor's  tube but sadly 
it hasn't been as popular as I'd hoped.

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[neonixie-l] Re: Take a look at this....

['threeneurons' via neonixie-l]

> As for a "one-off", home made project,... No power is required 
> inductive power transfer. ...
>

Just as a clarification:

1) No power required for levitation

2) Inductive power transfer, to light up the nixies, and run the clock 
circuit. Only need in the ballpark of 5W. 

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[neonixie-l] Re: Take a look at this....

['threeneurons' via neonixie-l]

>
>
> https://www.kickstarter.com/projects/lasermad/time-flies-levitating-nixie-clock
>

£35,000 is a rather modest amount to get production running. If he needs 
plastic bits, the cost of dies are a tad steep. Also getting PCBs 
assembled. I don't think he's looking at hand soldering a bunch of boards, 
with sm parts, on them.

As for a "one-off", home made project, this is now very doable. With the 
abundance of low cost rare earth magnets, expect to see a lot of levitating 
gadgets soon. If done right, you only need the magnets placed and held, so 
they make a properly shaped field. No power is required. I'm currently 
running some experiments with Royer oscillators. These seem to work quite 
well for inductive power transfer. Much better than the H-bridge, I used on 
my old "Propeller Santa II", made about 10 years ago.

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[neonixie-l] Re: Take a look at this....

[Tony Adams]

Thanks for the comments everyone. A serious question though, would anyone 
consider it worth adding an IN-8-2 option for example? I'd expected anyone 
wanting a good looking nixie would have gone for Dalibor's tube but sadly 
it hasn't been as popular as I'd hoped.

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[neonixie-l] Re: Take a look at this....

[Dekatron42]

I wonder how well it goes with cat owners, maybe you should use a glass 
dome to cover it so your cat doesn't start to play with it

/Martin

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