Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.os.linux.misc > #95581
| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Newsgroups | comp.os.linux.misc |
| Subject | Re: My Computer History (Re: Is This An Old Folks Home?) |
| Date | 2026-11-12 22:51 +0100 |
| Message-ID | <4vohsmxvae.ln2@Telcontar.valinor> (permalink) |
| References | (9 earlier) <slrn11evu95.82s.spamtrap42@one.localnet> <284esmx8jg.ln2@Telcontar.valinor> <11d25gi$36fpm$1@dont-email.me> <f6mgsmxege.ln2@Telcontar.valinor> <11d5aj7$a627$1@dont-email.me> |
On 2026-11-12 22:20, Rich wrote: > Carlos E.R. <robin_listas@es.invalid> wrote: >> On 2026-11-11 17:35, Rich wrote: >>> Carlos E.R. <robin_listas@es.invalid> wrote: >>>> On 2026-11-08 05:23, Robert Riches wrote: >>>>> On 2026-11-08, Charlie Gibbs <cgibbs@kltpzyxm.invalid> wrote: >>>>>> On 2026-11-07, Lars Poulsen <lars@beagle-ears.com> wrote: >>>> >>>> >>>>> Within a few years either side of 1980, a professor in an EE class >>>>> told a story from early in his career. He was hired by GE to work >>>>> on _BIG_ (as in 8 feet to 16 feet diameter) motors and generators. >>>>> He said GE would hire EEs and teach them mechanical stuff, because >>>>> that worked better than hiring MEs and teaching them electrical >>>>> stuff. >>>>> >>>>> He was tasked with solving a problem with premature bearing failure. >>>>> When a failed machine was torn down, basically all the failed >>>>> bearings were found to be coated with varnish. It turns out the >>>>> moving parts within the bearing assembly were building up a static >>>>> electric charge, which would eventually arc through the oil, >>>>> creating a small spot of varnish. Eventually, the varnish would >>>>> build up, and the bearing would fail. >>>>> >>>>> The solution was to add something to the oil to make it slightly >>>>> conductive to electricity. Management told him he had just earned >>>>> his salary for his entire career--and to go do it again. >>>>> >>>>> The professor's last name was Clegg. He taught at Brigham Young >>>>> University. >>>>> >>>> >>>> There is something I don't understand. The entire machine would be >>>> built of metal, except the insulation on the coils. Ball bearings >>>> are metal, the balls are made of metal. How could the static build >>>> up? Maybe the oil layer was insulation enough? >>> >>> Oil functions to lubricate moving parts by forming a very thin liquid >>> layer between the bearing surfaces. So the actual metal of the >>> bearings (if the lubrication is properly maintained) never actually >>> make contact. The bearings "float apart" on a microscopically thin >>> layer of oil. >> >> Makes sense. But I never knew this for sure. >> >>> >>> But oil, sans additives, is an insulator, so there is also no direct >>> path for electrical conduction. So if the motion did build up static >>> charges, they would eventually arc through the oil layer. That arcing >>> would likely do no good for the oil in the path of the arc, so the >>> "convert to varnish" makes overall sense. >> >> Yep... >> >> >> So this probably affects all machines, right? Cars included. > > It would seem to potentially impact all moving machinery where the > motion could build up a static electric charge. But in the case of > cars, engine oil contains a lot of additives so engine oil may also be > slightly conductive (or very, I've never dipped ohmmeter probes into > engine oil to test) such that the charge bleeds away before it reaches > arc potential. > > In the electronics world, antistatic matts for work benches, and the > anti-static wrist bands worn by workers to bleed off static, are > grounded through (typically) 1M (mega - million) ohm resistors. So it > does not take much conductivity to bleed away static charge buildups > before they reach arc over potential. The 1M ohm resistances to ground > are present so the workers don't get shocked via their anti-static > wrist bands by being grounded and then brushing/touching a live, > non-isolated, source of electric potential. > I remember technicians ignoring the wrist bands, still wrapped in the new plastic bags, hung from the racks, never used. They gave me one or two as gifts. When the rubber in those degraded and got sticky I bought a new one. -- Cheers, Carlos. ES🇪🇸, EU🇪🇺;
Back to comp.os.linux.misc | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Is This An Old Folks Home? Farley Flud <ff@gnulinux.rocks> - 2026-11-02 23:08 +0000
Re: Is This An Old Folks Home? "Carlos E. R." <robin_listas@es.invalid> - 2026-11-03 02:51 +0100
On the on-topicness of tape drives (was: Re: Is This An Old Folks Home?) Nuno Silva <nunojsilva@invalid.invalid> - 2026-11-04 23:47 +0000
Re: On the on-topicness of tape drives Rich <rich@example.invalid> - 2026-11-05 04:14 +0000
Re: On the on-topicness of tape drives c186282 <c186282@nnada.net> - 2026-11-05 17:29 -0500
Re: On the on-topicness of tape drives Rich <rich@example.invalid> - 2026-11-05 22:52 +0000
Re: On the on-topicness of tape drives c186282 <c186282@nnada.net> - 2026-11-05 19:11 -0500
Re: On the on-topicness of tape drives Rich <rich@example.invalid> - 2026-11-06 02:41 +0000
Re: On the on-topicness of tape drives c186282 <c186282@nnada.net> - 2026-11-05 22:31 -0500
Re: On the on-topicness of tape drives Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-11-06 20:51 +0000
Re: On the on-topicness of tape drives rbowman <bowman@montana.com> - 2026-11-07 02:41 +0000
Re: On the on-topicness of tape drives Lars Poulsen <lars@beagle-ears.com> - 2026-11-07 06:39 -0800
Re: On the on-topicness of tape drives rbowman <bowman@montana.com> - 2026-11-07 18:30 +0000
Re: On the on-topicness of tape drives Lars Poulsen <lars@beagle-ears.com> - 2026-11-07 15:26 -0800
Re: On the on-topicness of tape drives rbowman <bowman@montana.com> - 2026-11-08 01:15 +0000
Re: On the on-topicness of tape drives The Natural Philosopher <tnp@invalid.invalid> - 2026-11-08 11:28 +0000
Re: On the on-topicness of tape drives rbowman <bowman@montana.com> - 2026-11-08 18:14 +0000
Re: On the on-topicness of tape drives Beej Jorgensen <beej@beej.us> - 2026-11-06 05:59 +0000
Re: Tape Drives Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-11-06 06:18 +0000
Re: Tape Drives Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-11-07 18:40 +0800
Re: Tape Drives Peter Flass <Peter@Iron-Spring.com> - 2026-11-07 07:33 -0700
Re: Tape Drives c186282 <c186282@nnada.net> - 2026-11-07 13:12 -0500
Re: Tape Drives "Kerr-Mudd, John" <admin@127.0.0.1> - 2026-11-08 14:32 +0000
Re: Tape Drives c186282 <c186282@nnada.net> - 2026-11-08 21:31 -0500
Re: Is This An Old Folks Home? c186282 <c186282@nnada.net> - 2026-11-02 21:08 -0500
Re: Is This An Old Folks Home? rbowman <bowman@montana.com> - 2026-11-03 02:26 +0000
Re: Is This An Old Folks Home? Woozy Song <suzyw0ng@outlook.com> - 2026-11-04 09:55 +0800
Re: Is This An Old Folks Home? c186282 <c186282@nnada.net> - 2026-11-03 22:14 -0500
Re: Is This An Old Folks Home? Rich <rich@example.invalid> - 2026-11-04 03:54 +0000
Re: Is This An Old Folks Home? Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-11-04 06:21 +0000
Re: Is This An Old Folks Home? TJ <TJ@noneofyour.business> - 2026-11-05 20:40 -0500
Re: Is This An Old Folks Home? c186282 <c186282@nnada.net> - 2026-11-05 21:52 -0500
Re: Is This An Old Folks Home? "Carlos E. R." <robin_listas@es.invalid> - 2026-11-06 14:28 +0100
My Computer History (Re: Is This An Old Folks Home?) Lars Poulsen <lars@beagle-ears.com> - 2026-11-06 18:37 -0800
Re: My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-07 00:51 -0500
Re: My Computer History (Re: Is This An Old Folks Home?) Lars Poulsen <lars@beagle-ears.com> - 2026-11-07 06:20 -0800
Re: My Computer History (Re: Is This An Old Folks Home?) Peter Flass <Peter@Iron-Spring.com> - 2026-11-07 07:38 -0700
Re: My Computer History (Re: Is This An Old Folks Home?) Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-11-08 02:47 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) Robert Riches <spamtrap42@jacob21819.net> - 2026-11-08 04:23 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-11-08 05:00 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-08 20:50 -0500
Re: My Computer History (Re: Is This An Old Folks Home?) Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-11-09 03:53 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) "Carlos E.R." <robin_listas@es.invalid> - 2026-11-10 15:06 +0100
Re: My Computer History (Re: Is This An Old Folks Home?) rbowman <bowman@montana.com> - 2026-11-10 19:11 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-10 23:04 -0500
Re: My Computer History (Re: Is This An Old Folks Home?) "Carlos E.R." <robin_listas@es.invalid> - 2026-11-10 15:01 +0100
Re: My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-10 22:45 -0500
Re: My Computer History (Re: Is This An Old Folks Home?) "Carlos E.R." <robin_listas@es.invalid> - 2026-11-11 13:38 +0100
Re: My Computer History (Re: Is This An Old Folks Home?) Robert Riches <spamtrap42@jacob21819.net> - 2026-11-11 15:09 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) "Carlos E.R." <robin_listas@es.invalid> - 2026-11-12 12:57 +0100
Re: My Computer History (Re: Is This An Old Folks Home?) Rich <rich@example.invalid> - 2026-11-11 16:35 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) "Carlos E.R." <robin_listas@es.invalid> - 2026-11-12 12:57 +0100
Re: My Computer History (Re: Is This An Old Folks Home?) Rich <rich@example.invalid> - 2026-11-12 21:20 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) "Carlos E.R." <robin_listas@es.invalid> - 2026-11-12 22:51 +0100
Re: My Computer History (Re: Is This An Old Folks Home?) Peter Flass <Peter@Iron-Spring.com> - 2026-11-07 07:31 -0700
Re: My Computer History (Re: Is This An Old Folks Home?) Lars Poulsen <lars@beagle-ears.com> - 2026-11-07 06:52 -0800
Re: My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-07 20:09 -0500
Re: My Computer History (Re: Is This An Old Folks Home?) Thomas Koenig <tkoenig@netcologne.de> - 2026-11-08 08:08 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-08 21:24 -0500
Re: My Computer History (Re: Is This An Old Folks Home?) Lars Poulsen <lars@beagle-ears.com> - 2026-11-08 18:34 -0800
Re: My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-08 22:54 -0500
Re: My Computer History (Re: Is This An Old Folks Home?) Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-11-09 04:39 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-09 21:08 -0500
Re: My Computer History (Re: Is This An Old Folks Home?) Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-11-10 02:25 +0000
Re: My Computer History Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-11-10 02:32 +0000
Re: My Computer History c186282 <c186282@nnada.net> - 2026-11-09 23:07 -0500
Re: My Computer History Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-11-10 18:36 +0000
Re: My Computer History rbowman <bowman@montana.com> - 2026-11-10 19:15 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-09 22:49 -0500
Re: My Computer History (Re: Is This An Old Folks Home?) Lars Poulsen <lars@beagle-ears.com> - 2026-11-10 06:03 -0800
Re: My Computer History (Re: Is This An Old Folks Home?) Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-11-10 18:36 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) scott@slp53.sl.home (Scott Lurndal) - 2026-11-10 15:08 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-10 23:36 -0500
Re: My Computer History (Re: Is This An Old Folks Home?) Peter Flass <Peter@Iron-Spring.com> - 2026-11-09 07:29 -0700
Re: My Computer History (Re: Is This An Old Folks Home?) The Natural Philosopher <tnp@invalid.invalid> - 2026-11-09 16:11 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-09 21:19 -0500
Re: My Computer History (Re: Is This An Old Folks Home?) Bob Eager <throwaway0008@eager.cx> - 2026-11-10 14:31 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-10 23:21 -0500
Re: My Computer History (Re: Is This An Old Folks Home?) Bob Eager <throwaway0008@eager.cx> - 2026-11-11 12:11 +0000
Re: My Computer History (Re: Is This An Old Folks Home?) Lynn Wheeler <lynn@garlic.com> - 2026-11-09 07:48 -1000
Re: My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-09 21:55 -0500
Re: My Computer History (Re: Is This An Old Folks Home?) Peter Flass <Peter@Iron-Spring.com> - 2026-11-09 21:35 -0700
Re: My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-10 21:32 -0500
Re: spooling, My Computer History (Re: Is This An Old Folks Home?) John Levine <johnl@taugh.com> - 2026-11-09 16:56 +0000
Re: spooling, My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-09 21:46 -0500
Re: spooling, My Computer History (Re: Is This An Old Folks Home?) Robert Riches <spamtrap42@jacob21819.net> - 2026-11-10 18:06 +0000
Re: spooling, My Computer History (Re: Is This An Old Folks Home?) Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-11-10 18:45 +0000
Re: spooling, My Computer History (Re: Is This An Old Folks Home?) "Carlos E.R." <robin_listas@es.invalid> - 2026-11-12 13:00 +0100
Re: spooling, My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-11 00:03 -0500
Re: spooling, My Computer History (Re: Is This An Old Folks Home?) "Carlos E.R." <robin_listas@es.invalid> - 2026-11-12 13:04 +0100
Re: spooling, My Computer History (Re: Is This An Old Folks Home?) c186282 <c186282@nnada.net> - 2026-11-12 17:45 -0500
Re: spooling, My Computer History (Re: Is This An Old Folks Home?) John Levine <johnl@taugh.com> - 2026-11-10 19:26 +0000
Re: Is This An Old Folks Home? Beej Jorgensen <beej@beej.us> - 2026-11-04 19:15 +0000
Re: Is This An Old Folks Home? Farley Flud <ff@gnulinux.rocks> - 2026-11-04 20:38 +0000
Re: Is This An Old Folks Home? Nuno Silva <nunojsilva@invalid.invalid> - 2026-11-04 23:51 +0000
Re: Is This An Old Folks Home? "s|b" <me@privacy.invalid> - 2026-11-05 17:48 +0100
Re: Is This An Old Folks Home? Robert Riches <spamtrap42@jacob21819.net> - 2026-11-05 16:56 +0000
Re: Is This An Old Folks Home? The Natural Philosopher <tnp@invalid.invalid> - 2026-11-05 20:55 +0000
Re: Is This An Old Folks Home? "Joel W. Crump" <joelcrump@gmail.com> - 2026-11-06 12:23 -0500
Re: Is This An Old Folks Home? Farley Flud <ff@gnulinux.rocks> - 2026-11-06 19:25 +0000
Re: Is This An Old Folks Home? "Joel W. Crump" <joelcrump@gmail.com> - 2026-11-06 15:59 -0500
Re: Is This An Old Folks Home? rbowman <bowman@montana.com> - 2026-11-07 02:50 +0000
Re: Is This An Old Folks Home? Nuno Silva <nunojsilva@invalid.invalid> - 2026-11-07 09:03 +0000
Re: Is This An Old Folks Home? rbowman <bowman@montana.com> - 2026-11-07 18:01 +0000
Re: Is This An Old Folks Home? The Natural Philosopher <tnp@invalid.invalid> - 2026-11-07 21:55 +0000
Re: Is This An Old Folks Home? rbowman <bowman@montana.com> - 2026-11-08 01:01 +0000
Re: Is This An Old Folks Home? "Carlos E.R." <robin_listas@es.invalid> - 2026-11-12 12:43 +0100
Re: Is This An Old Folks Home? The Natural Philosopher <tnp@invalid.invalid> - 2026-11-12 15:32 +0000
Re: Is This An Old Folks Home? "Carlos E.R." <robin_listas@es.invalid> - 2026-11-12 22:47 +0100
Re: Is This An Old Folks Home? L Thorpe <lt666@sixsixsix.net> - 2026-11-07 18:31 +0000
Re: Is This An Old Folks Home? "Joel W. Crump" <joelcrump@gmail.com> - 2026-11-07 13:39 -0500
Re: Is This An Old Folks Home? L Thorpe <lt666@sixsixsix.net> - 2026-11-07 19:07 +0000
Re: Is This An Old Folks Home? "Joel W. Crump" <joelcrump@gmail.com> - 2026-11-07 14:30 -0500
Re: Is This An Old Folks Home? "Joel W. Crump" <joelcrump@gmail.com> - 2026-11-07 13:01 -0500
Re: Is This An Old Folks Home? c186282 <c186282@nnada.net> - 2026-11-07 15:54 -0500
Re: Is This An Old Folks Home? "Joel W. Crump" <joelcrump@gmail.com> - 2026-11-08 00:33 -0500
Re: Is This An Old Folks Home? c186282 <c186282@nnada.net> - 2026-11-08 21:05 -0500
Re: Is This An Old Folks Home? "Joel W. Crump" <joelcrump@gmail.com> - 2026-11-10 05:30 -0500
Re: Is This An Old Folks Home? c186282 <c186282@nnada.net> - 2026-11-10 22:03 -0500
Re: Is This An Old Folks Home? c186282 <c186282@nnada.net> - 2026-11-06 23:00 -0500
csiph-web