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Saukkis posted:What's the reason for safety wiring no more than three bolts at a time? I don't think there is one. I work on aircraft, I see more than three bolts being wired regularly.
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Jun 24, 2016 18:01
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Saukkis posted:What's the reason for safety wiring no more than three bolts at a time? The length of wire has to be a bit more than twice as long as the collective distance the wire must travel, so you end up working with these ridiculously long pieces of wire. It's easier and faster to wire them in pairs or triplets, and the effect is the same.
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Jun 24, 2016 18:11
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Phanatic posted:I don't think there is one. I work on aircraft, I see more than three bolts being wired regularly. AgentJayZ has a good video illustrating lockwire techniques https://www.youtube.com/watch?v=OwFjUX6SaY8 And half an hour of miserable fiddling - "Hardest Lockwire" https://www.youtube.com/watch?v=hcxHQXYU-Os Blitter fucked around with this message at 20:16 on Jun 24, 2016 |
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Jun 24, 2016 18:12
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Saukkis posted:What's the reason for safety wiring no more than three bolts at a time? The wire work hardens as you go along. You can wire more but it becomes a pain in the nuts.
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Jun 24, 2016 21:18
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Now I want someone to wire lock wheel lugs because of how rediculously  it would look.
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Jun 24, 2016 21:59
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Collateral Damage posted:I'm really curious how that happened since tanks are wide and have a pretty low center of gravity. Fell off the trailer? Since its at an angle to the road at an intersection, my guess would be on a flatbed and the driver took the turn too fast.
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Jun 24, 2016 22:03
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 Saw this today going home.
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Jun 25, 2016 01:16
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cursedshitbox posted:
Moremoneythansense.jpg
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Jun 25, 2016 01:23
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cursedshitbox posted:
Eh, you see that a lot very summer time in Australia. Some old Land Crusier or Patrol with an incorrectly balanced boat trailer behind it
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Jun 25, 2016 01:54
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I mean credit where its due for that Yukon tho.
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Jun 25, 2016 04:35
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You Am I posted:Eh, you see that a lot very summer time in Australia. Some old Land Crusier or Patrol with an incorrectly balanced boat trailer behind it The IRS commodores are my favourite, running on the bump stops with only about 25mm of the inside edge of the tyre touching the road.
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Jun 25, 2016 12:40
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Psh, that doesn't even look like it's doing structural damage to the vehicle.
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Jun 25, 2016 12:53
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BlackMK4 posted:The wire work hardens as you go along. You can wire more but it becomes a pain in the nuts. 
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Jun 25, 2016 14:34
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Savington posted:The length of wire has to be a bit more than twice as long as the collective distance the wire must travel, so you end up working with these ridiculously long pieces of wire. It's easier and faster to wire them in pairs or triplets, and the effect is the same. AC 43.13-1B Chapter 7-124 Subpart a. posted:When bolts, screws, or other parts are You CAN wire more than three, but it's a royal pain in the rear end, and generally not worth it unless the MM specifically calls for it to be done like that. Safety wire generally comes five or six different gauges (.020, .032, and .041 are the most common by a huge margin,) and in four common materials: stainless steel, monel, inconel, and brass. SS is the go-to, and is used everywhere. Inconel and Monel are generally only used on engines, during overhaul; Most line mechanics never touch the stuff. Brass wire is used for safetying switches and the like, generally in the cockpit. Things like fuel-dump safety covers are wired down, but are still easy to break with just finger pressure. Yes, I've come across these things safetied down with stainless wire. Thats a HUGE no-no. 
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Jun 25, 2016 22:26
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Monel is also kickass. You ever wonder why a ton of people can't wear cheapass jewelry but can still have a pair of metal glasses strapped to their head every waking hour and not break out*? Monel. It's a nickel/copper alloy that's resistant to nearly any corrosion (including saltwater) but is also pretty workable with most methods, but it work hardens like a motherfucker. I think it's stronger than nickel, too (but more difficult to polish) and IIRC can't be electroplated onto something. Wikipedia says that a few Monel alloys can withstand a pure-oxygen fire  *except for cheap coatings. PS that green poo poo on your glasses isn't the metal corroding, it's your sebum and bacteria feeding on it making what opticians call "face cheese." Clean your glasses.
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Jun 25, 2016 23:08
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Monel also welds like mud with sewage in it. Still better than aluminum though.
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Jun 25, 2016 23:16
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Yeah but for poo poo like glasses, safety wire, and internal clock mechanisms, it is awesome.
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Jun 25, 2016 23:30
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Geirskogul posted:Yeah but for poo poo like glasses, safety wire, and internal clock mechanisms, it is awesome. We fixed a desk on the ship with a monel sleeve since it was the only fitting that fit the pipe on the leg. $600 fix for a desk leg
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Jun 25, 2016 23:34
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Geirskogul posted:Wikipedia says that a few Monel alloys can withstand a pure-oxygen fire What does this mean? Pure oxygen doesn't burn.
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Jun 26, 2016 17:31
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It means a fire with literally nothing but a fuel, heat, and oxygen. None of that nitrogen poo poo most of our atmosphere is made of.
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Jun 26, 2016 18:23
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Fine, but that still doesn't mean anything. What is the fuel? Zirconium burns hotter than acetylene, which burns hotter than wood, regardless of the atmosphere. I really have a hate-on for useless gee-whiz superlatives like that, which sound impressive to the layman but mean nothing 
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Jun 26, 2016 23:15
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Here's a good demonstration of the effects of a pure oxygen environment on metal - steel wool is heated until glowing, then violently bursts into flame when exposed to 100% oxygen.
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Jun 26, 2016 23:43
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Sagebrush posted:Fine, but that still doesn't mean anything. What is the fuel? It does mean something, and the fuel in that example would be monel. quote:I really have a hate-on for useless gee-whiz superlatives like that, which sound impressive to the layman but mean nothing Apollo 1 suggests it does mean something.
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Jun 27, 2016 00:24
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Geoj posted:Here's a good demonstration of the effects of a pure oxygen environment on metal - steel wool is heated until glowing, then violently bursts into flame when exposed to 100% oxygen. What weird world do you live in where you don't immediately just check youtube? https://www.youtube.com/watch?v=KXc-WXdg03Y&t=11s
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Jun 27, 2016 00:27
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Sagebrush posted:What does this mean? Pure oxygen doesn't burn. Goddamn you fuckwit this is why I've had you on ignore for two years. It means that in a pure oxygen environment, where other poo poo is burning (like, the steel of a hull, or the tubing of a nasal cannula), the monel alloy won't ignite. Back you go.
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Jun 27, 2016 00:59
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Geirskogul posted:Goddamn you fuckwit this is why I've had you on ignore for two years. It means that in a pure oxygen environment, where other poo poo is burning (like, the steel of a hull, or the tubing of a nasal cannula), the monel alloy won't ignite. I love this forum.
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Jun 27, 2016 03:44
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Phanatic posted:It does mean something, and the fuel in that example would be monel. If the fuel is monel then by definition doesn't that mean that it's not withstanding the fire?
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Jun 27, 2016 05:40
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EKDS5k posted:If the fuel is monel then by definition doesn't that mean that it's not withstanding the fire? If it catches fire then it catches fire, yes. The claim was that monel will not oxidize when heated in a pure oxygen atmosphere, whether the heat comes from combustion of something else or another source.. I'm sure monel will go up just fine when you hit it with ClF3 or something stupid like that.
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Jun 27, 2016 06:07
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Why not just superheat the oxygen? What could possibly go wrong?
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Jun 27, 2016 06:17
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Midjack posted:If it catches fire then it catches fire, yes. The claim was that monel will not oxidize when heated in a pure oxygen atmosphere, whether the heat comes from combustion of something else or another source.. I'm sure monel will go up just fine when you hit it with ClF3 or something stupid like that. Enough pressure and temp and pretty anything will burn in a pure O2 environment! "Some Nasa PDF posted:Monel alloys, nickel-copper alloys, are the least ignitable alloys commonly used as structural materials. Monel 400 and K-500 have not ignited in particle impact tests (although some surface melting and burning may be observed) and do not burn upwards in upward flammability tests even at oxygen pressures as high as 69 MPa (10000 psia). Monel alloys ignite in frictional heating tests at higher loads than stainless steels, but the fire does not propagate. (Monel alloys have unusually high values for the friction coefficient m). Oh, man chapter 3 is a cool read; lots of metals being encouraged to burn via friction, impact etc!
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Jun 27, 2016 06:27
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I wouldn't be surprised if F2O2 can oxidize it, but if we're going to mention poo poo like that or ClF3 there isn't much that won't violently shed electrons.
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Jun 27, 2016 06:58
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If it's not hypergolic at standard temp/pressure it's not worth mentioning. https://www.youtube.com/watch?v=M4l56AfUTnQ
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Jun 27, 2016 09:11
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Bring me a 50/50 mixture of TEA/TEB and you'll show yourself hypergolic.
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Jun 27, 2016 09:19
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Pff, triethylborane is used to light rocket fuel, ClF3 is rocket fuel.
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Jun 27, 2016 09:26
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Enourmo posted:Pff, triethylborane is used to light rocket fuel, ClF3 is rocket fuel. ClF3 is better described as a "better oxygen" in the fire triangle. You still need a fuel that it will burn (Hint: almost everything is a fuel for ClF3)
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Jun 27, 2016 10:02
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Maxwells Demon posted:ClF3 is better described as a "better oxygen" in the fire triangle. You still need a fuel that it will burn (Hint: almost everything is a fuel for ClF3) Y'all motherfuckers need to read the Things That Go FOOF In The Night thread. Dioxygen Difluoride burns actually everything.
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Jun 27, 2016 10:06
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I'm pretty sure chlorine trifluoride will oxidize oxygen itself. E: In the sense of stealing electrons, not "adding oxygen".
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Jun 27, 2016 10:06
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Enourmo posted:I'm pretty sure chlorine trifluoride will oxidize oxygen itself. John Drury Clark, the guy who literally wrote the book on liquid rocket fuel posted:It is, of course, extremely toxic, but that's the least of the problem. It is hypergolic with every known fuel, and so rapidly hypergolic that no ignition delay has ever been measured. It is also hypergolic with such things as cloth, wood, and test engineers, not to mention asbestos, sand, and water — with which it reacts explosively. It can be kept in some of the ordinary structural metals — steel, copper, aluminum, etc. — because of the formation of a thin film of insoluble metal fluoride which protects the bulk of the metal, just as the invisible coat of oxide on aluminum keeps it from burning up in the atmosphere. If, however, this coat is melted or scrubbed off, and has no chance to reform, the operator is confronted with the problem of coping with a metal-fluorine fire. For dealing with this situation, I have always recommended a good pair of running shoes.  Apparently it will actively burn sand, CO2, water, and Halon, so there is no known way to suppress a ClF3 fire
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Jun 27, 2016 10:30
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I was making a pun, dammit! Also yes let us remember that chlorine trifluoride was considered by Nazi weapons scientists to be too unstable and dangerous for use as a weapon and it is transported in aluminium drums as the layer of aluminium oxide that forms on aluminium in air is one of the few things ClF3 cannot burn If something happens to nick through the oxide layer run literally a fish fucked around with this message at 10:52 on Jun 27, 2016 |
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Jun 27, 2016 10:49
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literally a fish posted:Also yes let us remember that chlorine trifluoride was considered by Nazi weapons scientists to be too unstable and dangerous for use as a weapon And recall that the V‐2 killed more people in its manufacture than in its deployment, so that’s a pretty high bar.
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Jun 27, 2016 11:40
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