Magnetic Spacers

7 posts / 0 new
Last post
Haggai
Offline
Last seen: 1 month 2 weeks ago
Joined: 01/06/2011 - 04:05
Posts: 1012
Location: Israel
Magnetic Spacers

What magnets can serve as spacers / multimeter leads attachment?

Can I use these neodymium discs? (like http://www.dealextreme.com/p/super-strong-rare-earth-re-magnets-10-pack-9-mm-also-suitable-for-extending-18650-cr123a-batteries-3461)

Are they good enough? Good conductivity, negligible resistance, heat resistant?

Reviewers say they are fragile, do you know of anything stronger?

Anything better?

okwchin
okwchin's picture
Offline
Last seen: 2 weeks 2 days ago
Joined: 01/07/2011 - 04:41
Posts: 1150
Location: Australia

Yes, they are fragile, but at the same time, I wouldn't use anything else for spacers. The magnetic strength make them alot of fun, and I'm much more confident that these magnets will stick to the battery, and stay stuck to the battery, instead of float around against circuit boards.

Conductivity is not bad, perfectly adequate for torchlight use. Heat resistance is acceptable. Neos demagnetise in the 60-80 deg C temp range, however unless your driver is really hot, and your batteries get really hot too, I wouldn't be concerned. They are somewhat brittle, you must be careful not to let them come together uncontrollably, In that you must bring magnets back together slowly. Letting magnets come together from a distance will result in shattered magnets.

 

I say give them a go. I dont use any other magnets at all after having a few neos to play with. The big ones are especially fun.

"like everyone else - I’m looking for my next “last” flashlight" -  ohnonothimagain

Don
Don's picture
Offline
Last seen: 2 years 4 months ago
Joined: 01/12/2010 - 16:32
Posts: 6617
Location: Scotland

Haggai wrote:

What magnets can serve as spacers / multimeter leads attachment?

Can I use these neodymium discs? (like http://www.dealextreme.com/p/super-strong-rare-earth-re-magnets-10-pack-9-mm-also-suitable-for-extending-18650-cr123a-batteries-3461)

Are they good enough? Good conductivity, negligible resistance, heat resistant?

Reviewers say they are fragile, do you know of anything stronger?

Anything better?

 

I prefer thicker ones than the DX magnets. But the ones I have cost rather more.

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

Haggai
Offline
Last seen: 1 month 2 weeks ago
Joined: 01/06/2011 - 04:05
Posts: 1012
Location: Israel
Don
Don's picture
Offline
Last seen: 2 years 4 months ago
Joined: 01/12/2010 - 16:32
Posts: 6617
Location: Scotland

Looks like the ones I have. Never given me any trouble and I've never shattered one.

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

Boaz
Boaz's picture
Offline
Last seen: 5 hours 18 min ago
Joined: 11/07/2010 - 09:31
Posts: 7088
Location: Birthplace of Aviation

Have  rare earth magnets in them I think is what I read ..I never heard that and magnetrons were always a ton of money and  so were the magnets ... so is it worth beating a magnatrn apart with a hammer for magenets ..Sure cuz we're all  just that wacky .. avoid the  start capacitor Or discharge it .. unless you like death or your hair standing up like don kings ..

Something to think about when you drive by the pile of trash on some hot summer night  and see a nasty old micro wave  at the curb . it might save you 4 $ or it might cause a 3  hour stay in the E.R.   you decide

       καὶ τὸ φῶς ἐν τῇ σκοτίᾳ φαίνει καὶ ἡ σκοτία αὐτὸ οὐ κατέλαβεν

                                  https://www.gty.org/

 

    Still selling diffuser film  >…  http://budgetlightforum.com/node/42208

fishinfool
fishinfool's picture
Offline
Last seen: 1 month 2 weeks ago
Joined: 03/09/2010 - 00:30
Posts: 4342
Location: Hilo, Hawaii

That's a tough one Boaz but I think I'll spend the 4 bucks on magnets and avoid the pain.

 

Don wrote:

"But as I said long ago, you are more likely to be killed by a dead fish dropped by a seagull in the Sahara Desert than by a lithium ion