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14 INCH DICK TURBO posted:My dad had like a 30 year old paint can of some sort of industrial carb dip, I dunked one of my old carbs and it came out shiny new in about a minute. Got some on my hands and it seriously felt like I had poured boiling water all over them instantaneously. Wonder what it was. I miss that stuff... <sigh>
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# ? Sep 19, 2011 05:24 |
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# ? Jun 8, 2024 06:53 |
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14 INCH DICK TURBO posted:My dad had like a 30 year old paint can of some sort of industrial carb dip, I dunked one of my old carbs and it came out shiny new in about a minute. Got some on my hands and it seriously felt like I had poured boiling water all over them instantaneously. Wonder what it was. Superfund site in a can. You can probably still get the stuff, whatever it is, but it definitely isn't sold over the AutoZone counter as carb cleaner.
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# ? Sep 19, 2011 05:30 |
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I hear HFl is great for etching parts. Would it be overkill to wear gloves while I'm dunking engine components?
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# ? Sep 19, 2011 06:08 |
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You mean hydrofluoric acid, the stuff that penetrates your skin without a mark and then eats your bones? Yes, you should probably wear gloves.wikipedia posted:Hydrogen fluoride gas is a severe poison that may immediately and permanently damage lungs and the corneas of the eyes. Water solutions (hydrofluoric acid) are a contact-poison with the potential for deep, initially painless burns, with later tissue death. By interfering with body calcium metabolism, the concentrated acid may also cause systemic toxicity and eventual cardiac arrest and fatality, after contact with as little as 160 cm2 (24.8 square inches) of skin.
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# ? Sep 19, 2011 06:21 |
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thelightguy posted:You mean hydrofluoric acid, the stuff that penetrates your skin without a mark and then eats your bones? Yes, you should probably wear gloves.
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# ? Sep 19, 2011 06:57 |
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peepsalot posted:Also don't forget that it's one of the few acids that will dissolve glass. gutta percha 4 lyfe
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# ? Sep 19, 2011 09:21 |
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I am very familiar with good ol' aircraft remover. When I was 12-14 my dad would make me strip bike frames with it for 15 bucks a piece, which I may or may not have gotten because he "didn't have the money right now goddamnit stop asking or you won't get it ever." It's weird stuff, slather it on like barbecue sauce and let it sit for 15-20 minutes. Depending on the paint, sometimes it makes a nice dramatic crackling and everything comes off really quickly like on that jeep, and sometimes it just makes the paint soft enough to scrape off. Even though it goes right through paint, it doesn't hurt rubber kitchen gloves and if you douse it with water it gets immediately deactivated and changes from a thick liquid to something that very closely resembles mucus. If you get it on your skin it starts to burn in a weird way, almost like very strong menthol. I'm pretty sure it's called aircraft remover because it was developed for use on aircraft where sandblasting would be too abrasive on the aluminum. Also, picture of a small mechanical failure that caused the particularly horrific mechanical failure at Reno: something something joke about aircraft remover i own every Bionicle fucked around with this message at 14:10 on Sep 19, 2011 |
# ? Sep 19, 2011 14:07 |
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Wojcigitty posted:Also, picture of a small mechanical failure that caused the particularly horrific mechanical failure at Reno: Isn't that like an aileron for the aileron? It's hard to believe that something that minor could cause such trouble, but I guess when you're 100 feet off the ground going 400 mph there is no such thing as a minor problem...
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# ? Sep 19, 2011 15:12 |
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JD Brickmeister posted:Isn't that like an aileron for the aileron? It's hard to believe that something that minor could cause such trouble, but I guess when you're 100 feet off the ground going 400 mph there is no such thing as a minor problem... ailerons are on the wings and control direction... that is (was) an elevator flap. You lose one of those and you lose the ability control whether you are going straight ahead, up, or down. That's how he ended up going straight into the ground in the middle of the crowd instead of flying over them.
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# ? Sep 19, 2011 15:24 |
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JD Brickmeister posted:Isn't that like an aileron for the aileron? It's hard to believe that something that minor could cause such trouble, but I guess when you're 100 feet off the ground going 400 mph there is no such thing as a minor problem... It's a trim tab for the elevator. By adjusting the angle that that tab has with the elevator, you adjust where the elevator wants to stay with no pressure on the stick. When it broke like that it became impossible for the elevator to be moved...or at least that's what I read elsewhere on the internet.
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# ? Sep 19, 2011 15:36 |
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Aircraft paint remover doesn't have any free hydrogen ,so it doesn't embrittle metals it touches. IIRC YMMV et.al
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# ? Sep 19, 2011 16:02 |
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Why don't they just use crushed walnut shells instead? Interesting fact about crushed walnut shells: http://en.wikipedia.org/wiki/Boeing_CH-47_Chinook#Notable_accidents_and_incidents posted:On 11 September 1982, at an airshow in Mannheim, Germany a United States Army Chinook (serial number 74-22292) carrying parachutists crashed, killing 46 people. The crash was later found to be caused by an accumulation of ground walnut shells that had been used to clean the machinery.[79][80][81] They were using them to clean certain hydraulic control parts and they clogged up the hydraulic lines, causing that incident. So they don't use 'em for that purpose no mo.* *edit: actually not, see 2 post down VVVV whose tuggin fucked around with this message at 17:56 on Sep 19, 2011 |
# ? Sep 19, 2011 16:27 |
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Plain old FOD there. Someone didn't do their inspection properly.
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# ? Sep 19, 2011 17:03 |
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The Scientist posted:
No, they used them to clean transmissions during overhauls, and they didn't clean this one out enough when they were done with it, for whatever reason, and the grit blocked the lubrication channels, leading to failure of a journal bearing for the input pinion. The hydraulic system wasn't involved at all.
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# ? Sep 19, 2011 17:21 |
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Phanatic posted:No, they used them to clean transmissions during overhauls, and they didn't clean this one out enough when they were done with it, for whatever reason, and the grit blocked the lubrication channels, leading to failure of a journal bearing for the input pinion. The hydraulic system wasn't involved at all. Oh ok, thanks for that. I was trying to find the episode of the History channel's "Modern Marvels: Engineering Disasters" that I first saw it on, but couldn't so just used that wiki article referencing it. Does anyone recall a similar crash attributed to walnut shells involving a blackhawk instead of a chinook? Maybe I'm mis-remembering that part, as well.
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# ? Sep 19, 2011 17:55 |
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The Scientist posted:walnut shells Peanuts are bad luck at auto races for some reason.
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# ? Sep 19, 2011 18:22 |
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thelightguy posted:You mean hydrofluoric acid, the stuff that penetrates your skin without a mark and then eats your bones? Yes, you should probably wear gloves. He was making fun of people for using aircraft remover without gloves (I hope)
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# ? Sep 19, 2011 19:09 |
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# ? Sep 19, 2011 20:37 |
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heat posted:He was making fun of people for using aircraft remover without gloves (I hope) We have a winner! Actually, skin and eye protection are a good idea with pretty much any cleaning agent/solvent stronger than ammonia, especially where prolonged or repeated exposure is involved.
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# ? Sep 19, 2011 21:23 |
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Shroomie posted:Pinion bearing failure?
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# ? Sep 19, 2011 21:25 |
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DJ Commie posted:Pinion bearing failure? Something along those lines, I don't really remember. I just found it while digging through a pile of old, useless car parts.
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# ? Sep 19, 2011 21:31 |
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Looks like an outer pinion bearing failure to me.
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# ? Sep 19, 2011 22:11 |
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DJ Commie posted:Pinion bearing failure? I have seen this a few times. Pinion bearing failure, even the pinion nut backing off can cause this.
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# ? Sep 19, 2011 22:34 |
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Coasterphreak posted:We have a winner! Protip: Brake cleaner destroys nitrile gloves. The typical blue gloves shrivel up and look like they have goosebumps before falling apart. DELETED fucked around with this message at 23:18 on Sep 19, 2011 |
# ? Sep 19, 2011 23:04 |
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DELETED posted:Protip: Brake cleaner destroys latex gloves. The typical blue gloves shrivel up and look like they have goosebumps before falling apart. What about nitrile gloves?
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# ? Sep 19, 2011 23:09 |
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EightBit posted:What about nitrile gloves? Nitrile are a good "base" glove. I wear a pair of either latex or nitrile under my acid gloves not only out of practice from work, but preventative measure in the event the acid gloves had a pinhole or other tear.
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# ? Sep 19, 2011 23:11 |
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EightBit posted:What about nitrile gloves? Scratch that, I meant nitrile.
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# ? Sep 19, 2011 23:18 |
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DELETED posted:Scratch that, I meant nitrile. Good thing I don't brush my teeth with that stuff, unlike some of you guys.
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# ? Sep 19, 2011 23:58 |
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B4Ctom1 posted:I have seen this a few times. Pinion bearing failure, even the pinion nut backing off can cause this. forgot that one, yeah that can cause it too... ALWAYS USE A BRAND NEW PINION NUT FOR FINAL ASSEMBLY! Hell, you should probably use a new one for setup as well, though it can be a regular grade 8 or ISO PC 10.9 not one of the special staked all-metal locknuts specifically for pinion usage. A friend of mine wrecked a brand new gearset trying to save a few bucks by doing his setup using the old factory nut, it rounded off a couple threads and then stripped out.
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# ? Sep 20, 2011 03:15 |
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The talk of HF reminded me of this blog post on some other "interesting" chemistry involving fluorine: http://pipeline.corante.com/archives/2010/02/23/things_i_wont_work_with_dioxygen_difluoride.phpquote:Even Streng had to give up on some of the planned experiments, though (bonus dormitat Strengus?). Sulfur compounds defeated him, because the thermodynamics were just too titanic. Hydrogen sulfide, for example, reacts with four molecules of FOOF to give sulfur hexafluoride, 2 molecules of HF and four oxygens. . .and 433 kcal, which is the kind of every-man-for-himself exotherm that you want to avoid at all cost. The sulfur chemistry of FOOF remains unexplored, so if you feel like whipping up a batch of Satan's kimchi, go right ahead.
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# ? Sep 20, 2011 05:27 |
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# ? Sep 20, 2011 05:38 |
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The Electronaut posted:The talk of HF reminded me of this blog post on some other "interesting" chemistry involving fluorine: http://pipeline.corante.com/archives/2010/02/23/things_i_wont_work_with_dioxygen_difluoride.php One of my favorite blogs... PS, ClF3 (yup, holy poo poo, you can start running now) is even worse than FOOF. It's a stronger oxidizer than oxygen and will spontaneously combust on contact with such reactive things as wet sand, asbestos fireproofing, cement, rock, glassware, lab assistants, etc. Same guy has a pretty good article on it, I think it's titled "wet sand won't save you now". During one of the world wars (iirc) they had mixed up A TON OF IT (literally) and somehow (unsurprisingly) it got spilled or the containment was broken. As a result it ate a significant hole through a thick cement floor and consumed the sand and gravel under the floor leaving approximately a 1 meter deep crater, and spewed wonderful fluorine and chlorine based chemical vapors and acid fogs everywhere in the process. I wish I had pictures of this... e: http://pipeline.corante.com/archives/2008/02/26/sand_wont_save_you_this_time.php kastein fucked around with this message at 06:33 on Sep 20, 2011 |
# ? Sep 20, 2011 06:15 |
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kastein posted:One of my favorite blogs... PS, ClF3 (yup, holy poo poo, you can start running now) is even worse than FOOF. It's a stronger oxidizer than oxygen and will spontaneously combust on contact with such reactive things as wet sand, asbestos fireproofing, cement, rock, glassware, lab assistants, etc. Same guy has a pretty good article on it, I think it's titled "wet sand won't save you now". All this talk of horrible sulphur and flouride compounds, and yet sulphur hexaflouride is inert and completely harmless. Hell, think about how dangerous "sodium chloride" sounds for a second.
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# ? Sep 20, 2011 09:59 |
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KozmoNaut posted:All this talk of horrible sulphur and flouride compounds, and yet sulphur hexaflouride is inert and completely harmless. Yeah, but it exists in equilibrium with S2F10, which is really NOT harmless. Those guys doing the anti-helium voice thing with SF6 on youtube? They're idiots.
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# ? Sep 20, 2011 12:32 |
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Captain Postal posted:Yeah, but it exists in equilibrium with S2F10, which is really NOT harmless. Those guys doing the anti-helium voice thing with SF6 on youtube? They're idiots. Yeah, but it's still hilarious and you can do it with xenon instead, which just works kinda like nitrous oxide. I love how Wikipedia states that S2F10 is a possibly by-product of electrically decomposed SF6 and that SF6 is an essentially inert insulator used in high voltage systems such as transmission lines, substations and switchgear.
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# ? Sep 20, 2011 12:35 |
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KozmoNaut posted:Yeah, but it's still hilarious and you can do it with xenon instead, which just works kinda like nitrous oxide. Its also what they inject into your eyeball if your retina detaches. The pressure holds it in place while it hopefully regrows. The SF6 eventually works its way out via osmosis.
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# ? Sep 20, 2011 13:54 |
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kastein posted:One of my favorite blogs... PS, ClF3. That quote from Ignition! is great: quote: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.
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# ? Sep 20, 2011 14:48 |
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KozmoNaut posted:All this talk of horrible sulphur and flouride compounds, and yet sulphur hexaflouride is inert and completely harmless. Hell, think about how dangerous "sodium chloride" sounds for a second. Speaking as someone who has a disciplinary action in my employee file that says, essentially, "stop labeling bottles as "dihydrogen monoxide" and leaving them places where inter-departmental auditors can see them", I can attest that otherwise-educated people will freak the gently caress out over chemical names. As far as SF6 being harmless, I wish someone had told the EPA and the NRC before they made us both replace all of our gas-insulated switchgear and promise to never, ever use SF6 as a tracer gas for air inleakage ever again.
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# ? Sep 20, 2011 15:17 |
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Ossetepo posted:As far as SF6 being harmless, I wish someone had told the EPA and the NRC before they made us both replace all of our gas-insulated switchgear and promise to never, ever use SF6 as a tracer gas for air inleakage ever again. That may have something to do with SF6 being a greenhouse gas more than 22,000 times more potent than CO2
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# ? Sep 20, 2011 15:44 |
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# ? Jun 8, 2024 06:53 |
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We use a ton of SF6 in radar operations.
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# ? Sep 20, 2011 18:39 |