Testing Magnet Strength

[Michael GilliganParticipant @michaelgilligan61133]

This is, of course, an ‘Advertorial’ … but it’s quite informative:

https://www.kjmagnetics.com/blog/testing-magnet-strength

MichaelG.

[Speedy Builder5Participant @speedybuilder5]

Yersss!!  “Choose a highly magnetic steel” – then we can guess how it may perform in the application doesn’t sound very scientific to me.  Was this a school project ?

Bob

[Nigel Graham 2Participant @nigelgraham2]

It looks a bit higher than school level but I was puzzled who the intended audience may be.

It is shallower than, say, A-Level Physics but might point to what studying magnetism within that syllabus could include. My A-Level text book devotes a highly mathematical* chapter to electromagnetism, but not a great deal to magnetic materials and “fixed” magnets.

That the company manufactures powerful magnets – then rather disenguously blames some of the “strength” on the steel it is attracting – suggests to me it is for industrial customers, such as manufacturers of electrical machines or on the other hand, of equipment that might not want magnets anywhere around.

Though one would expect the designers of those already understand magnetism, magnets, ferrous-alloy characteristics and the like to far higher levels than that advertisement.

 

…….

*Including this symbol (I hope this site’s text-editor lets it through!):

∮

I thought that is the sign for Integrated Transport around Greater London…

….. I’ll get my overalls.

 

 

[Martin KyteParticipant @martinkyte99762]

Or you could get a magnetometer app for your phone?

[Michael GilliganParticipant @michaelgilligan61133]

Sorry to have bothered all you clever chaps !

As I said, it’s just an advertorial … no better or worse than some of the padding in ME&W or any other magazine.

MichaelG.

[SillyOldDufferModerator @sillyoldduffer]

Taste’s vary – I didn’t find anything objectionable in the presentation. It’s effective as a non-mathematical description.

Nigel is right that A-Level magnetism is mathematical, and my electrical engineering books are much worse.  Magnetism isn’t simple, so expecting a scientific approach on a promotional web-site is asking too much.   It’s there to attract customers, not to impress experts.

I’m not puzzled by the intended audience. It’s not Model Engineers or A-Level Physics students.  And I had no problem with simplifications like “highly magnetic steel”, which is explained.

It’s about my level!   Moderately interested, prepared to have a go, own several dated textbooks, and struggle with the maths.

I’m glad Michael posted the link – I found information interesting.  Reminds me: there’s an unfinished electro-magnet project on my To Do list.   I stopped work needing magnet wire, which arrived months ago, and never got back to it.   Too many distractions!

Dave

 

 

 

[Martin ConnellyParticipant @martinconnelly55370]

It reminds me of the labels on lifting magnets and the user instructions for them. It is notable that lifting magnets may give the pull force but do not give either a safe working load (SWL) or working load limit (WLL) because there are so many variables in any lift.

A Bux 1000kg maximum lifting magnet has a pull of 3000kg but not a SWL. The FAQ section has the following:

What parameters affect the lifting capacity of the device?
Material thickness, surface structure, type of metal and coating or dirt can affect the tensile force of the device. For safe operation of the device, please observe the performance specifications in the enclosed instructions and the condition of each workpiece to be lifted.

There are a lot of similarities with the referenced link.

Martin C

[Author]

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