Buyer's Guide: Grades of Magnets
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- Опубликовано: 8 июн 2013
- Beer, vodka and magnets? Sounds like the recipe for disaster but that's what I'll use to explain grades of magnets!
It's important to know about grades when shopping for neodymium magnets. In this video I tell you about the basics of it and compare the powers of ferrite- and neodymium magnets. Feel free to ask questions if you need help or in doubt.
Music credit for the outro:
'Junkyard Tribe' by Kevin MacLeod
ISRC: USUAN1200021
incompetech.com/music/royalty-...
English captions available - just press CC under the video. Danish captions coming soon... 
Наука
Thank you very much!
I've always loved science and have never understood why so relative few people are interested in it.
I try to share my fascination of it and hope people can see that science can appeal to most people.
Luckily it looks like people are beginning to realize that there's more to RUclips than just music videos and people failing ;)
Hello
Thanks for watching! I have more magnet videos coming when I find time for making them so stay tuned :)
Thanks for the support! More videos to come so stay tuned ;)
Best Channel on RUclips for making things clear about science. Wish you a long and fruitful career as an educator of folks who've been curious about science since junior high school. Love the common sense and humor put into your demonstrations. Wish that it was mandatory for all high school students to watch- we had "Mr. Wizard" back then- you're the wizard now my friend!
There's an interesting project about 'transformational nanostructured permanent magnets' that expect up to 80 MGOe (the equivalent of a N80 neodymium magnet!). I really hope they succeed!
As far as I know the strongest neodymium magnet ever created in the lab was around N59 - the theoretical limit for Nd2Fe14B is N63-64 but that will probably never be achieved (you cannot get 100% pure neodymium or iron for that matter as ingredients for the magnets).
Thanks for watching!
Hell yes. THANK YOU. I was a bit curious about magnets but could not have wished for a more thorough introductionary video. You rock.
Wow, great video. Glad to see you are still making videos, I always enjoy watching them even if they don't have anything to do pertaining to my life!
Very nice and informative. I couldn't find all this information in one place and easily explained as you did. Thank you for taking the time to teach and inform others.
Just wanted to say that your vids are REALY well made , and very nice to watch :D
Brian Bro... Your voice is calming :)
Thanks Marco :) I am a calm person, so my voice doesn't lie :D
I really enjoy ALL your videos! They're amazing.
Wow!!! Thank you, thank you, thank you!!!I have been looking for something to explain magnets, because I'd like to go magnet fishing as a hobby.
i love these vidos, with the apocalypse at hand they are very comforting. thank you!
This was really informative and helpful! Thank you
Good vid .. simple ... a true Kraut comparison - magnetic strength to alcohol - LOL it was great ..and a good way to understand it simply .. thank you ...
Great info with tongue in cheek humor. Thanks!
+Greg Barnett
Thanks for watching :)
Wow very interesting, and you made it easily understandable for an idiot like me.. Your poor beer!.. Now off to watch more of your cool videos.. Keep them coming please.
Thanks for watching :)
I will upload as often as possible - but this is only my hobby and my free time is limited. But I really enjoy making these videos so more will come.
Brainiac75 Have you ever successfully drilled a neodymium magnet? Bar under flowing coolant of course.
Love your videos please keep em coming 👌
Thank you for this video. It helped tremendously
Great video man! Funny and informative.
Valuable footage that enlightens the audience.
Thanks for the support from all of you! I have the best subscribers :)
These are fantastic. Thanks for uploading.
Very helpful video. Many Thanks!!!!!
Nicely done.
very cool explanation, thanks!
the ohh my beer got me. been watching you for years but now that i even know for sure youre german you got a sub😂
Love your videos!
Awesome videos! You should use meat or ballistic gel to demonstrate how dangerous metal objects and these types of magnets can be! Personally I don't know whether it would damage it but from what I've seen your largest one should make for an interesting video!
Thanks :)
It is neodymium magnets they use/used in MRI-scanners. They just use a lot of single magnets in them (up to 1 to 3 tons of them for each scanner according to Avalon Rare Metals!) stacked in a special configuration. Most likely some sort of halbach array - I don't really know.
That's not a bad idea. I may make such a video. In my video 'How is a 6" neodymium magnet delivered?' you can see how my big magnet is stored in the original packaging.
There are also some short clips in my video 'Testing my magnet collection'.
Feel free to ask if there is something in particular you would like to know.
Awesome information,thanks
another well made vid! :) Cheers.
1-3 tons of neodymium magnets, no wonder they switched to using super conductive magnets. Thank you for the reply, I really appreciate it :)
Great! I'm interesting find some magnet material for build audio coils & transformers! I'm also interested many kind of things! All the best! Assa!
man , we love you too ^_^ keep up the good work , i mean you educate the humanity . thanks
Great video as always. I was wondering how do Neodymium magnets compare to magnets used in MRI scanners. Not the superconductive magnets but the permanent-magnet used in older MRI scanners.
Well look who finally uploaded a video.
Your vids are awesome!
Very useful thank you.
Because they are awesome!
Thank you so much!!
Informative and comical :)
All of your videos are fantastic. I work in aerospace as an FAA/EASA inspector of jet engine components and I am about to go back to school for metallurgy and polymers, so these are a great learning tool.
About your gold watch-band test; is it better to do that with a spherical magnet, and what if the size and RHmax of the one you were using?
Thanks :) Any shape of magnet will work for the test but I often use a spherical magnet because it focuses its magnetic force to a smaller spot on its pole. This gives it an intense field suitable for detecting the magnetic susceptibility of the material being tested. The shown magnet is a 1 inch N45 magnet. Bigger size and stronger grade will give a faster, more visible reaction.
thx. it helped me for what i need to know
Love how you compare magnets to alcohol!
That's very generous of you!. I may have to arrange a trip to Aarhus ;)
I have a question about my 40x20 mm neodymium-magnet. I think that grade n35 is stronger than grade n45. How is this possible?
Good work.
Thanks for this wonderful video which u entitled
" Buyer's Guide " whilst u did not refer to where one can buy such magnets or price rates . Will u please do ?
It's actually from magnetportal'de but both are selling the exact same magnet from the same surplus stock from a German generator company that changed the way they make generators (Siemens??).
Yes, I'm from Denmark :)
Thanks for new video
If I had access to supercooling I would experiment with superconductors :)
Neodymium magnets improve their strength down to around -138*C but lower than that and they start loosing some power. Replacing the neodymium completely with praseodymium (Pr2Fe14B) makes some strong magnets that increase in strength the more you cool them - even at very, very low temperatures. I wish I had access to a lab...
Thank you.
The magnetic field still penetrates the pyrolytic carbon even though it is highly diamagnetic. So you would have a quite normal magnet except for a fragile coating that would constantly try to escape the magnet :)
How did you make the magnet attacking the beer look so much like a horror movie? It's almost like stop motion- super uncanny
How strong is a proton’s positive magnetic pull?
always interesting :)
Can you do some vids on using mags to deflect end & radiation?
Two magnets with the same physical density will have a similar magnetic acceleration, though the field strength will diminish far quicker with distance on one that is smaller, and being the same distance relative to the ratio of the diameters of the two magnets will give you some complicated formula that basically tells you that it's weaker than one would think
That is actually quite tricky if you have a magnet of unknown grade. A gaussmeter is my only idea but those are expensive.
Can you please make a video on how you store your magnets?
Now ik which magnets i want for my cube :)
What size/grade/ type would you suggest for an excellent fridge magnet. Something that will hold 10 pieces of paper easily
+st D
It actually depends a lot on the thickness of the sheet plate that your fridge is made of.
On my modern Samsung fridge a 12x8 mm N45 disc magnet will easily hold 10 sheets of A4-paper.
Do think it's possible to create even stronger magnets in the future any ideas?
Yes, but it would require an ever changing magnetic field to make something spin. And that requires energy. It is much easier to let wind or flowing water spin a turbine to get energy.
In my personal opinion magnets are very well understood scientifically and follows the laws of conservation of energy. So no 'free' energy can be made from them. They are very good at converting kinetic energy to electricity though.
Hiya. Great Video thanks. I am creating a hexagonal spice jar rack that I intend on placing a magnet into the lid so it can attach to the fridge. Do you think a 10mx2mm N35 will be strong enough for this? Thanks in advance for your help
Attaching a spice jar rack to a fridge is not that easy with magnets. The magnets will easily be pulled down - the fridge has thin sheets and is quite 'slippery'. So no, I believe you need larger magnets or other tricks. Here's some info: www.kjmagnetics.com/blog.asp?p=leverage
Thank you for your help
does anyone know where i can get the n45 magnet he was using in the video
Like your videos
iRhinoPro Thanks! Stay tuned - more to come :)
So basically ferrite magnets are x10 weaker then neodymium magnets, is that correct?
Yes, that is a good rule of thumb.
Beer and Vodka. Something we can all relate to ! ! !
you should make your slide (@:52) as a downloadable slide -- very nice for teachers -- thanks
I don't think there are any videos on youtube exploring the reduction of magnet power at very low temperatures. That might be interesting to see with a magnet put in liquid nitrogen.
I would like to see someone do a nuclear magnetic resonance measurement of the free induction decay of protons in earth's magnetic field and then compared to the higher frequency when immersed in the intense field of one of these magnets.
I'm thinking of buying two 50mm (diameter) X 25mm (thickness) magnets. Is there anyway to separate them if they are stuck together without a spacer? I've seen a guillotine method and the tool costs around $50.
Yes, you can separate that size with a large 'guillotine' even without spacer. In this video I do it with two 70x20mm: Spacer or No Spacer
50x25mm is quite a size so I would definitely recommend using a solid tool for separating them.
I was just wondering because my apartment is really small and the only place I can place the magnet box is in my kitchen, and there is like a bunch of metal knives and electronics there :)
Quality over quantity ;)
Whats the 2 balls fighting called
I used to work for a company that did computer upgrades and refurbishment. I would take the old 5.25" floppy drives home and cannibalize them for the magnets inside. They made great fridge magnets, but I would never place them away from an edge area of the fridge(where they could be pried off). Could you tell me if they were most likely, historically ferrite or neos? I have no idea. They were incredibly strong for their relatively small thickness, so I would guess neodymium.... I wish I could still get my hands on some of these.
You can still cannibalize hard disk drives for neodymium magnets :)
I have no experience with the old 5.25" floppy drives but neodymium magnets were invented in 1982 so they could easily be part of the drives made in the 1980's - especially if you found them very strong for their size. If they had a silvery, metallic coating they were not ferrite magnets.
Thanks for sharing your story!
What is the name of that strong magnet
Why did the neodymium magnet get attracted to the beer? Was there iron oxide in it or what?
Nope, sorry.
Max theoretical power for a neodymium magnet is N63-64. The highest lab tested neodymium magnet grade I have reliable sources for is N59 (according to a seminar at CERN in 2009 so it may be a little higher today).
With that said neodymium magnets from HDD can be quite high grade, so you still have a nice magnet :)
It would be great if you had a scale that had a maximum pressure guide. It would provide accurate PSI (or whatever) as to when the metal broke free of the magnet. You simply slide it back down to zero for the next test. Cheers
I may be able to find an electronic scale that stores/holds the maximum weight measured if I ever need this measurement again in a future video.
Brainiac75
Knowing you it will look and function perfectly :D Cheers
Hi
How to get Nd38SH magnet? Is any supplier in india?
usually neodymium magnets are nickel plated, but what happens if a large neodymium magnet is coated by pyrolitic carbon?
where do u buy ur magnets
why working temp is so low compared to magnet Curie temperature ? A.k.a. the max temp before demagnetisstion begins?
2:54 you should start a magnet asmr series
I want a magnetar-grade magnet. Where can I buy one of those?
the prizes really gone down since this, could you do maybe new video aobut magnets of today and prizes
how did you do that scene ???
on 2:50
you moved magnet with another on under the table but did they crush each other ??????????? so many questions
Yes, I did move the magnet by using another magnet. But there was only one magnet on top of the table, when I did it. The rest is video editing ;)
Brainiac75 oooo Thank You for response
De bedste tilbud på større neo magneter er på den tyske eBay.de. Supermagnete.de har relativt gode tilbud og stort udvalg af mindre magneter. Forsendelsen er dog noget dyr, da de er nødt til at sende dem som pakker i papkasser. I almindelige kuverter ville magneterne sætte sig fast overalt hos postvæsenet :)
Så det kan bedst betale sig at spare lidt sammen og købe en større sending hjem af gangen.
Would like to see you super cooling your magnets if you could. I might be too ignorant to know what I just said.
thanks
wow thanks :)
Do you have an email address? I have some questions as to the drop off distances when using permanent magnets and electro magnets. Cheers
loooong time since your last video :(
Do you have any online shop for all super and bigger size of magnets? How can I order even I'm here in UAE?
+Lon Revadenera Sorry, I don't sell magnets - I'm just a collector. I think magnet4less.com will ship to UAE, but you have to ask them first and expect a high delivery cost at slow speed. Shipping large magnets is done by sea freight - putting them on an airplane needs a lot of expensive shielding.
Ok....thanks brother.
but how can you tell the grade of a magnet? thanks :)
Thanks for the intel, sorry about the beer.
that our brow by the way broke both hix neodymium magnet end the ferrite.
i have a headphones. it says it has neo magnet.. so is there a way i can take it out from there?
Yes, but it will be destructive for the headphones ;) The neo magnets in the headphones are probably glued into a metal structure, so it could be tricky to get them out. Remember that neo magnets are brittle and will not accept too much brute force.
+Brainiac75 thnx i will try to get them out tommrow!
+Brainiac75 and yess just 2000 subscribers left.. if u remember me i asked about that will u do on 100000 subscribers... i know its a suprise!
tathaagat s siddhartth Yep. A little more info about the 100k video in my latest video I just uploaded ;)