Looking for a non-magnetic, strong, easily glued material

Only 2001 views and 39 posts on this thread so far? Donald and John are slipping. Ooops. 40 now.

Edited By Hopper on 30/04/2022 01:15:36

Dave W - yes, this is an excellent call.

I have now run some tests on magnetic prototyping software and it seems that the key metric is (magnetic) Relative Permeability and it turns out that "non-magnetic" stainless steel (e.g. 316L), 1050 Aluminium and Nylon all have a magnetic Relative Permeability of very close 1. And for this reason magnetically speaking when in 'permanent' magnetic fields there is little to choose between them.

Meanwhile I have already now got my hands on both some 1050 Aluminium and some 316L Stainless Steel, but not the Nylon 6. Given how much physically stronger the 316L is compared to 1050, I have started experimenting with the 316L first.

And so far the 316L is working... beautifully. I think we have a winner!

So bad luck to the pedants & detractors... and a big thank you to those of you how have been helpful. 

I think we're done here.

Cheers

Don

PS Once it arrives, I shall also experiment with the Nylon 6 as that may prove to be useful too.

Edited By Donald MacDonald 1 on 30/04/2022 02:56:51

Congrats Don!

KBO, eh?!

J

The Johnny / Dr.Donny show grinds to a halt?

.

Or has it become a double-act ?

”I think we have a winner!” has a familiar ring to it

MichaelG.

It's not the only thing that has a familiar ring to it.

.

I’m sure there must be more, so this is probably a case of mistaken identity … but I did find reference to one Ph.D. thesis by Donald MacDonald : **LINK**

https://researchr.org/publication/ethos-6428

Unfortunately, the actual content is not there … so perhaps it was ‘Secret’

MichaelG.

Thank you for sharing. I use POM for my magnetic holders and didn't expect any metal would be "magnetically" comparable.

Topic: "Unsupervised neural networks for visualisation of data"

That's got to be it. Describes several threads to a tee.

Don, glad my input was of use. Dave W

Interesting topic!

I would like to see a reference to software used to compare relative permeabilities of the different materials and as a result a list of these values. I assume it must have been rather a search on the Internet than a theoretical calculation.

Nice to read about a book of Frans de Waal about chimpanzee politics in this topic. Remember he is a Dutchman from origin! 😉

And now that we have a winner for this one, what will be the next quest? The best sock to make a puppet from?

Well, who'd a - thunkit! Frankly you don't need "magnetic prototyping software" for that, it was obvious at the beginning. See Wikipedia - could have saved 3 pages of threads and given you your answer in minutes.

I bet he's looking down, having a good laugh at that one.

Regards Ian.

Edited By Circlip on 30/04/2022 10:30:16

Hopper refers to a Forum phenomenon called a 'Sock Puppet'. This is where an individual creates two or more accounts and uses them to post comments supporting his own views. The aim is to create the illusion that controversial views are independently supported, when they aren't.

Sock-puppetry is arrogantly dishonest and damages the reputation of individuals caught doing it. In the same boat as cheating at cards - a mind-set capable of doing it can't be trusted.

Dave

"Finite Element Method Magnetics"

You guys have WAY too much time on your hands. No offence but you'd make excellent Chimps!

D

Only because you've made monkeys of us with your "carefully considered", but inaccurate, initial requirements.

Andrew

Yes I am sure he is up there having a good chuckle. Puts me in mind of this classic:

Why a FEM calculation?

I think magnetic permeability is an isotropic property. But I may be wrong, for “anisotropic” materials.

I think You made a FEM calculation to model your application but you used an isotropic value for magnetic permeability, just from literature. Perhaps we are chimpanzees, but not stupid. 😉

Maybe it is not Donald Macdonald 1 afterall

Edited By KWIL on 30/04/2022 12:23:08