Magnets on the work bench
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From: Jan Panteltje on 11 Feb 2010 08:11 On a sunny day (Thu, 11 Feb 2010 04:58:22 -0800 (PST)) it happened Chris <christofire(a)talktalk.net> wrote in <9f794283-f986-4e41-93af-5600bd2dbe34(a)z26g2000yqm.googlegroups.com>: >> �http://www.supermagnete.nl/eng/magnets.php?group=blocks_big > > > >Those are all about 1 tesla according to their table at >http://www.supermagnete.nl/eng/data_table.php, which seems typical for >Neodymium (-Iron-Boron) magnets, and those are 'the strongest magnets >in the world' according to that web site! Yes, mine are rates at about 1.2 Tesla.... >Tesla is the unit of flux density. The number around 40 is an 'energy >product' apparently: the square of B, in Tesla, divided by mu0 for >air, although the unit MegaGaussOersted must involve a strange >conversion. > >I recently had some NdFeB magnets delivered by mail to UK from >http://www.stewmac.com/shop/Tools/Special_tools_for:_Finishing/Guitar_Repai= >r_Magnets.html?actn=100101&xst=3&xsr=9 >... and I did wonder about them being carried in the hold of a plane. Nice, that those have a hole in it, good idea. I was wondering if I ordered one the 'Death' magnets, if the box it is in is small enough, how the postman would get it out of his little van :-) It would stick to the metal, and not let go. Your package probably did upset the plane's navigation equipment, and made a detour via an other continent ;-) >I wonder if it's significant that I ordered an even number?! Perhaps >if you order three, they send you a fourth one free of charge! > >Chris Marketing, it's ways are incomprehensible...
From: Royston Vasey on 11 Feb 2010 08:20 "Jan Panteltje" <pNaonStpealmtje(a)yahoo.com> wrote in message news:hl0uf3$u1m$1(a)news.albasani.net... > On a sunny day (Thu, 11 Feb 2010 06:45:06 -0500) it happened legg > <legg(a)nospam.magma.ca> wrote in > <gcr7n51ah8qfbeugdfhsviqggptlkukt9q(a)4ax.com>: > >>On Wed, 10 Feb 2010 20:09:08 GMT, Jan Panteltje >><pNaonStpealmtje(a)yahoo.com> wrote: >> >>>Just got myself some small magnets, these are not very strong, >>>specified as about 1.2 Tesla IIRC, but anyways, >>>had to take some stuff apart, and had them on the work bench. >>>Normally screws are all over the place, but with these magnets everything >>>just jumped to it :-) >>>Very easy, also used the magnets to magnetise my screwdrivers... >>>Works much easier. >> >>Magnetized tools can make manual smd placement a nightmare. >> >>RL > > I just tried the magnets on some 5.6 and 10 pF SMD caps, and they do not > stick? I had some cheap s/steel tweezers, they got magnetised and would pull 805 resistors around.
From: life imitates life on 11 Feb 2010 09:18 On Thu, 11 Feb 2010 12:32:13 GMT, Jan Panteltje <pNaonStpealmtje(a)yahoo.com> wrote: >On a sunny day (Wed, 10 Feb 2010 21:32:47 -0700) it happened D Yuniskis ><not.going.to.be(a)seen.com> wrote in <hl00kt$lc3$1(a)speranza.aioe.org>: > >><grin> I have 5T spinning and another ~10T "off-line" (tape and disc). >>Not counting audio/video media. >> >>Note that an OS failure can trash your drive in half an Ohnosecond >>(been there, done that... opted not to buy the T-shirt). This is >>why I backup on tape and optical media :< > >Yes, I have more then 750 DVDs in a alu case in the attic. >Some are the first DVDs that you could burn, say 10 years old now? >It is the backup... > >My OS does NOT trash my hd :-), it runs Linux, and I have Reiserfs with several partitions on the 1TB. Power loss does not equal HD trashing as much these days, even if a write operation was being performed when it happened. The most that gets lost usually is just the data that was being written at the time.
From: Spehro Pefhany on 11 Feb 2010 09:35 On Wed, 10 Feb 2010 14:06:37 -0700, D Yuniskis <not.going.to.be(a)seen.com> wrote: >Hi Jan, > >Jan Panteltje wrote: >> On a sunny day (Wed, 10 Feb 2010 13:49:55 -0700) it happened D Yuniskis >> <not.going.to.be(a)seen.com> wrote in <hkv5h1$em9$1(a)speranza.aioe.org>: >> >>> Jan Panteltje wrote: >>>> Just got myself some small magnets, these are not very strong, >>>> specified as about 1.2 Tesla IIRC, but anyways, >>>> had to take some stuff apart, and had them on the work bench. >>> <grin> We don't allow magnets in the house (way too much magnetic >>> media!) >> >> My floppies are far away in the attic, next to the CRT monitors... >> The CRT stuff was why I kept magnets away. > >I think the only floppies I now have left are those for the Unisite. >I'm more concerned with disks, mag tape, video tape and audio tape >(the last two just until I can finish transcribing everything to >digital format) I have a quite old HP logic analyzer (came with probes, LOL) that boots off a floppy. Took a bit of doing to back it up, but I did it. > >>>> Normally screws are all over the place, but with these magnets everything just jumped to it :-) >>>> Very easy, also used the magnets to magnetise my screwdrivers... >>>> Works much easier. >>> Only works with ferrous screws. Someday you'll find yourself wondering >>> why a particular screw "doesn't stick" (even if only for a moment). >>> Then, you'll find a more universal way to hold screws on your >>> screwdriver! ;-) >> >> Glue? > >There are some mechanical devices that can do this. I used to use >a magnetic screwdriver until encountering painted/plated nonferrous >screws (and wondering why it wouldn't "stick"). The same holds >true for nylon, of course. Also, when working in tight quarters >in a ferrous box, screws tend to "lean" off the screwdriver >towards the wall of the box -- since mounting holes are often >close to the edges of a box.
From: Spehro Pefhany on 11 Feb 2010 09:39
On Thu, 11 Feb 2010 01:31:27 -0800, Fred Abse <excretatauris(a)invalid.invalid> wrote: >On Wed, 10 Feb 2010 20:20:37 -0800, Greegor wrote: > >> Aren't most stainless machine screws made >> from alloys of stainless with ferrous steel in them? > >Name a non-ferrous steel ;-) Perhaps he means "ferritic". ;-) The 400-series (ferritic) stainlesses are quite ferromagnetic- you can pick up big chunks with an electromagnet. |