Magnets on the work bench
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From: Jan Panteltje on 11 Feb 2010 07:32 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. >There are other devices that will clip onto the shaft of a >{round, hex} screwdriver and grasp the screw from beneath the >head. This works with even nylon (soft) screws. And, allows >you to use whatever screwdriver you need (e.g., phillips, >reeds and prince, clutch, torx, etc.) for the fastener at hand. I will need to stock up on some more tools one day.
From: Jan Panteltje on 11 Feb 2010 07:33 On a sunny day (Wed, 10 Feb 2010 18:28:05 -0600) it happened John O'Flaherty <quiasmox(a)yeeha.com> wrote in <9ij6n5lhq8bi1rvno5i4sg76mgoib4pciq(a)4ax.com>: >This stuff works well and doesn't leave any deposits. It's reusable, >so a small package will last years: > >http://www.amazon.com/Henkel-1087306-Loctite-1-5-Ounce-Mounting/dp/B001F57ZPW' > >-- >John Good idea, thank you.
From: Jan Panteltje on 11 Feb 2010 07:43 On a sunny day (Thu, 11 Feb 2010 00:46:38 +0000) it happened Dirk Bruere at NeoPax <dirk.bruere(a)gmail.com> wrote in <7th2b0F376U2(a)mid.individual.net>: >Tim Williams wrote: >> "Chris" <christofire(a)talktalk.net> wrote in message >> news:d1a421a5-08da-44a2-baef-3f99c9103076(a)21g2000yqj.googlegroups.com... >>> Since when was 1.2 T 'not very strong'?! >> >> Since these bad boys showed up. >> http://www.magnet.fsu.edu/mediacenter/features/meetthemagnets/900mhz.html >> >> Tim >> >Nothing compared with magnestars (magnetars) >http://en.wikipedia.org/wiki/Magnetar > >10GT But they do not send them by mail, and it is a long trip to pick one up.
From: Jan Panteltje on 11 Feb 2010 07:50 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?
From: Chris on 11 Feb 2010 07:58
On 10 Feb, 22:51, Jan Panteltje <pNaonStpealm...(a)yahoo.com> wrote: > On a sunny day (Wed, 10 Feb 2010 13:19:55 -0800 (PST)) it happened Chris > <christof...(a)talktalk.net> wrote in > <d1a421a5-08da-44a2-baef-3f99c9103...(a)21g2000yqj.googlegroups.com>: > > >On 10 Feb, 20:09, Jan Panteltje <pNaonStpealm...(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. > > >Since when was 1.2 T 'not very strong'?! > > >Chris > > Since I can separate thing from it easily. > I think you can buy higher Telsa super magnets that come with a warning not to get your fingers > in between :-) > Wonder if they send them by mail, LOL. > 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! 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_Repair_Magnets.html?actn=100101&xst=3&xsr=9 .... and I did wonder about them being carried in the hold of a plane. 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 |