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Groups > sci.electronics.design > #519179
| Newsgroups | sci.electronics.design |
|---|---|
| Date | 2018-10-13 12:24 -0700 |
| References | <r2u1sddojvr815ukjlm0qhsr5bpa2fbe6s@4ax.com> <pprd4s$8s2$1@dont-email.me> |
| Message-ID | <3b61ba6c-2db5-4080-9144-c080861a5432@googlegroups.com> (permalink) |
| Subject | Re: various OTs |
| From | whit3rd <whit3rd@gmail.com> |
On Friday, October 12, 2018 at 5:10:09 PM UTC-7, Tim Williams wrote: > The recent spate of reaction wheel failures apparently is an ESD phenomenon. > Radiation causes photoemission on the bearing surfaces, accumulating charge, > which eventually discharges through the grease, pitting the bearing balls > and races, causing rising power consumption until the ratings are met and > the thing grinds to a halt. > > The solution: use insulating (ceramic) bearings. Yeah, maybe. Or, add a bit of contaminant so the grease conducts. I'd worry about chemical stability of oxide ceramics (zirconium oxide, for instance) in space; it's like a reducing atmosphere, and you're gonna be there for years, and care about microinches of surface finish. Metal should hold up well. If ZrO turns to Zr, though, it's gonna lose the smooth surface.
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various OTs John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-12 12:50 -0700
Re: various OTs George Herold <gherold@teachspin.com> - 2018-10-12 13:04 -0700
Re: various OTs John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-12 13:48 -0700
Re: various OTs George Herold <gherold@teachspin.com> - 2018-10-12 17:46 -0700
Re: various OTs dplatt@coop.radagast.org (Dave Platt) - 2018-10-12 14:53 -0700
Re: various OTs John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-12 15:30 -0700
Re: various OTs Martin Brown <'''newspam'''@nezumi.demon.co.uk> - 2018-10-13 10:13 +0100
Re: various OTs John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-13 09:33 -0700
Re: various OTs Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-13 14:15 -0400
Re: various OTs Martin Brown <'''newspam'''@nezumi.demon.co.uk> - 2018-10-15 10:09 +0100
Re: various OTs John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-15 06:50 -0700
Re: various OTs Clive Arthur <cliveta@nowaytoday.co.uk> - 2018-10-13 10:37 +0100
Re: various OTs DecadentLinuxUserNumeroUno@decadence.org - 2018-10-13 10:01 +0000
Re: various OTs John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-13 11:08 -0700
Re: various OTs John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-13 09:55 -0700
Re: various OTs MikeP <mjp993@googlemail.com> - 2018-10-16 03:22 +0000
Re: various OTs Robert Baer <robertbaer@localnet.com> - 2018-10-13 22:39 -0700
Re: various OTs Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> - 2018-10-14 21:43 +0200
Re: various OTs Robert Baer <robertbaer@localnet.com> - 2018-10-15 19:46 -0700
Re: various OTs DecadentLinuxUserNumeroUno@decadence.org - 2018-10-12 23:55 +0000
Re: various OTs Lasse Langwadt Christensen <langwadt@fonz.dk> - 2018-10-12 16:58 -0700
Re: various OTs bill.sloman@ieee.org - 2018-10-12 17:52 -0700
Re: various OTs speff <spehro@gmail.com> - 2018-10-18 06:53 -0700
Re: various OTs John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-18 06:59 -0700
Re: various OTs tabbypurr@gmail.com - 2018-10-18 14:10 -0700
Re: various OTs "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-18 17:49 -0500
Re: various OTs Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-18 21:04 -0400
Re: various OTs Steve Wilson <no@spam.com> - 2018-10-19 01:34 +0000
Re: various OTs <698839253X6D445TD@nospam.org> - 2018-10-19 07:11 +0000
Re: various OTs "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-12 19:10 -0500
Re: various OTs Lasse Langwadt Christensen <langwadt@fonz.dk> - 2018-10-13 06:22 -0700
Re: various OTs Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-13 14:16 -0400
Re: various OTs John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-13 17:19 -0700
Re: various OTs whit3rd <whit3rd@gmail.com> - 2018-10-13 12:24 -0700
Re: various OTs Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-13 17:30 -0400
Re: various OTs Jasen Betts <jasen@xnet.co.nz> - 2018-10-14 20:13 +0000
Re: various OTs John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-14 13:59 -0700
Re: various OTs Steve Wilson <no@spam.com> - 2018-10-14 23:58 +0000
Re: various OTs Steve Wilson <no@spam.com> - 2018-10-15 01:05 +0000
Re: various OTs Jasen Betts <jasen@xnet.co.nz> - 2018-10-15 05:57 +0000
Re: various OTs DecadentLinuxUserNumeroUno@decadence.org - 2018-10-15 11:09 +0000
Re: various OTs <698839253X6D445TD@nospam.org> - 2018-10-15 07:23 +0000
Re: various OTs "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-13 21:39 -0500
Re: various OTs bitrex <user@example.net> - 2018-10-13 00:08 -0400
Re: various OTs <698839253X6D445TD@nospam.org> - 2018-10-13 06:59 +0000
Re: various OTs John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-13 12:08 -0700
Re: various OTs <698839253X6D445TD@nospam.org> - 2018-10-13 07:27 +0000
Re: various OTs speff <spehro@gmail.com> - 2018-10-18 06:55 -0700
Re: various OTs Winfield Hill <hill@rowland.harvard.edu> - 2018-10-13 07:32 -0700
Re: various OTs John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-13 12:17 -0700
Re: various OTs Joseph Gwinn <joegwinn@comcast.net> - 2018-10-15 08:37 -0400
Re: various OTs Martin Brown <'''newspam'''@nezumi.demon.co.uk> - 2018-10-15 13:58 +0100
Re: various OTs Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-10-15 14:34 +0100
Re: various OTs Clifford Heath <no.spam@please.net> - 2018-10-16 10:26 +1100
Re: various OTs Clive Arthur <cliveta@nowaytoday.co.uk> - 2018-10-16 10:46 +0100
Re: various OTs tabbypurr@gmail.com - 2018-10-16 08:46 -0700
Re: various OTs Clive Arthur <cliveta@nowaytoday.co.uk> - 2018-10-16 19:53 +0100
Re: various OTs tabbypurr@gmail.com - 2018-10-17 05:56 -0700
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