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Magnets thread

Joined
Jun 29, 2019
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177
Do you think I could buy 4x2 and 4x1 magnets off of amazon? They are pretty cheap at 8 USD for 200. They are also N35.
 

Dr. Lube

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A quick question:

Why don't we flush mount magnets instead of putting them inside cubing pieces? Magnets are so much stronger when they are in contact than when they are separated by a couple of millimeters of plastic.
 

phuque99

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Aug 19, 2019
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A quick question:

Why don't we flush mount magnets instead of putting them inside cubing pieces? Magnets are so much stronger when they are in contact than when they are separated by a couple of millimeters of plastic.
I think it boils down to manufacturing cost of drilling and aligning holes correctly. If I'm not wrong, GAN 356 X magnets are in contact with each, with matching price tag.
 

Dr. Lube

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But still, if I could get away with 2x1 magnets instead of 4x2 it would save a lot of money and it may mean that I can put magnets in puzzles that would not normally accommodate them, like the MoYu Ki-bi-lo-minx. A jig should ensure that the holes and magnets are all in the same place and drilling into plastic isn't difficult.

I might try flush magnetizing one of my puzzles, although one with flat contact surfaces would make the job easier.
 

Dylan Swarts

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Okay.. so. I have recently been advised to consider buying 40 x Meilongs for Multi-BLD and to magnetize them. Now whilst I am still considering to buy them and do this, I would like to gain some more information first. I assume that the 'N' you talk about is Newton so I am assuming it is the strength of the magnets. The '4x2' and those things I have no idea about.
So that being said I can't really say exactly what magnets I like and which I would like for this project. Something a bit stronger than the Valk 3 Power M is what I want to aim at. Similar to the MoYu AoChuang GTSM's inner layers. Can anyone please assist me in this matter?
 

xyzzy

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Dec 24, 2015
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Okay.. so. I have recently been advised to consider buying 40 x Meilongs for Multi-BLD and to magnetize them. Now whilst I am still considering to buy them and do this, I would like to gain some more information first. I assume that the 'N' you talk about is Newton so I am assuming it is the strength of the magnets. The '4x2' and those things I have no idea about.
So that being said I can't really say exactly what magnets I like and which I would like for this project. Something a bit stronger than the Valk 3 Power M is what I want to aim at. Similar to the MoYu AoChuang GTSM's inner layers. Can anyone please assist me in this matter?
The N35/N42/N50/etc. refers to the grade of the magnets, which corresponds to the maximum possible magnetisation. Basically: larger number = stronger magnets. "4 × 2" refers to the size in millimetres (first number is the diameter, second number is the thickness).

I don't have any input regarding what magnets to use since I haven't really tried either the Valk Power M or the Aochuang GTSM, but you can check out teh yoshi's spreadsheet for a general guide.

Why don't we flush mount magnets instead of putting them inside cubing pieces? Magnets are so much stronger when they are in contact than when they are separated by a couple of millimeters of plastic.
More expensive and harder to mass produce, like others have said, but the key thing is that the magnetic pull when the layers are aligned is not the only thing that affects how magnets feel in a puzzle. Being a bit stronger when aligned wouldn't mean much if the slightest misalignment also causes the force to fall off steeply—this wouldn't be very different from classical friction-based alignment mechanisms, for example. For small magnets, the force between them obey an approximate inverse fourth power law, not inverse square (because the magnets are dipoles, not monopoles). You can't make the magnets too small for that reason, even if they're very strong. (Disclaimer: I haven't done the calculations (which can get very complicated), but "very small" here probably means something like 1 mm diameter.)

That said, a few puzzles feature magnet grooves where the plastic is thinner (e.g. Galaxy v2 and I believe the Aoshi GTS M as well), so it's not like puzzle designers haven't been thinking about reducing magnet distance.
 

Tabe

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Okay.. so. I have recently been advised to consider buying 40 x Meilongs for Multi-BLD and to magnetize them. Now whilst I am still considering to buy them and do this, I would like to gain some more information first. I assume that the 'N' you talk about is Newton so I am assuming it is the strength of the magnets. The '4x2' and those things I have no idea about.
So that being said I can't really say exactly what magnets I like and which I would like for this project. Something a bit stronger than the Valk 3 Power M is what I want to aim at. Similar to the MoYu AoChuang GTSM's inner layers. Can anyone please assist me in this matter?
What you want is 4x2 N35 magnets.
 

chron0s

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Joined
Feb 20, 2017
Messages
124
I took a non-magnetic Moyu GTS WR 3x3 and magnetized it with a cubicle strong magnet set - much stronger than the stock magnets, and a bit stronger feeling compared to the GTS3 ridged magnets. Maybe a bit too strong for my tastes - I'm going to try some 4x1.5 N38s in another one and compare.
 

xyzzy

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Joined
Dec 24, 2015
Messages
1,571
Also, is this the correct way to magnetize the 8x8? Or did I miss something?
View attachment 10879
Seems right.

(I used 4×1.5 N38 in my Cubing Classroom MF8, ended up a bit too weak for my liking. But it also seems like that cube will pop and explode at every opportunity, regardless of whether it's magnetised, so…)
 
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