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Isn't there a video floating around of someone smashing the ceramics on a spark plug and using that to shatter a side window? I forget the specifics of the technique but apparently the impossibly sharp edges that are produced make safety glass just fall apart.
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Aug 11, 2014 23:11
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xzzy posted:Isn't there a video floating around of someone smashing the ceramics on a spark plug and using that to shatter a side window? I forget the specifics of the technique but apparently the impossibly sharp edges that are produced make safety glass just fall apart. Yup. Tempered glass is a funny thing. Spark plug: https://www.youtube.com/watch?v=QhlmKHbPFhU hammer: https://www.youtube.com/watch?v=wbOF11mQTjs
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Aug 11, 2014 23:25
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they're called ninja stars and apparently they're illegal in california (lol)
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Aug 11, 2014 23:40
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I was able to kick the rear side window out of a Passat wagon while simultaneously drunk, hypothermic and pretty badly concussed. Just gotta hit it right.
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Aug 11, 2014 23:42
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Powershift posted:Yup. Tempered glass is a funny thing. yeah years ago I heard that certain shady motorcyclists/bikers would carry pocketfuls of these things to get back at lovely drivers. seems fair to me.
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Aug 11, 2014 23:50
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I've shattered the driver's window in the 244 by just shutting the door too hard while the window was off-track. I've also hurled old brake rotors at windows like a discus thrower and watched them just bounce right off, multiple times. Windows are loving strange. Fire-chat: I always try to carry an extinguisher with me ever since my friend's 1976 Celica fastback tried to burn itself down the first time I drove it, a few days after he bought the car. The PO had done some ghetto rear end fuel pump wiring with a toggle switch in the cabin as a sort of theft-deterrent. Except he had used too small a gauge of wire, and while he had remembered to put a fuse in the circuit, he had installed it on the ground side  Cue the wiring melting all of it's insulation off mid-drive, setting the carpet between the front seats on fire. That was loving exciting. Thankfully it went out easily and the only real damage was some carpet, but man, I would have loving cried if that car had burnt to the ground. (it was stolen 4 months later anyway  )
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Aug 11, 2014 23:56
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Terrible Robot posted:while he had remembered to put a fuse in the circuit, he had installed it on the ground side Maybe I'm misunderstanding, but this doesn't really change anything. There are probably standards and best practices and stuff, but a fuse doesn't care which wire it's on.
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Aug 12, 2014 00:26
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Slanderer posted:Maybe I'm misunderstanding, but this doesn't really change anything. There are probably standards and best practices and stuff, but a fuse doesn't care which wire it's on. It does if there's another path to ground that doesn't include the fuse, which is what sounds like happened. In an ideal circuit with only one possible path it shouldn't matter, but you want your shut off valve on the supply side even though it should still work on the discharge side.
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Aug 12, 2014 00:28
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drzrma posted:It does if there's another path to ground that doesn't include the fuse, which is what sounds like happened. In an ideal circuit with only one possible path it shouldn't matter. If there was another path to ground then the switch shouldn't have worked at all 
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Aug 12, 2014 00:29
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Slanderer posted:If there was another path to ground then the switch shouldn't have worked at all The switch was likely in the correct place, on the positive side. Insulation melts before the fuse, shorts to chassis avoiding the fuse. Switched supply is still providing power, now directly to the chassis/negative side. Edit: Hopefully the fuse is before the actual short, but undersize wires are lovely no matter what. Still better to have the fuse on the positive side assuming negative ground. drzrma fucked around with this message at 00:47 on Aug 12, 2014 |
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Aug 12, 2014 00:32
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drzrma posted:The switch was likely in the correct place, on the positive side. Insulation melts before the fuse, shorts to chassis avoiding the fuse. Switched supply is still providing power, now directly to the chassis/negative side. If the insulation is melting off your wires, then it still matter where your fuse is, since you'd potentially have uninsulated wire on both sides of the fuse.
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Aug 12, 2014 00:34
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Yeah, in this case the fuse wouldn't have helped at all, it was just one of the "oh, what the gently caress" things we found while post-incident inspecting the car.
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Aug 12, 2014 00:36
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Slanderer posted:If the insulation is melting off your wires, then it still matter where your fuse is, since you'd potentially have uninsulated wire on both sides of the fuse. True, but the closer the fuse is to the +12V source, the less likely there is to be a short-to-ground on that side of it.
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Aug 12, 2014 00:49
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IOwnCalculus posted:True, but the closer the fuse is to the +12V source, the less likely there is to be a short-to-ground on that side of it. Oh most definitely, it just seemed like the fuse was a total red herring in this instance.
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Aug 12, 2014 00:51
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  The doors still work 
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Aug 12, 2014 00:51
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That's why I try not to talk bad about unibody. 
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Aug 12, 2014 00:53
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That rollbar they weld into the middle of the unibody sure doesn't hurt. 
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Aug 12, 2014 00:53
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Powershift posted:
Sounds like a hell of a mechanical success to me. Engineering at work.
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Aug 12, 2014 02:03
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So this has to be the most Volkswagen-y situation ever. On my way home from work today, the map lights on my Passat started randomly flickering. The switches also got really wonky; hitting the left light button caused the right light to turn on, and hitting the right button caused both to turn off.  See that little screw on the left? It's located directly above the electrical contact for the left light, so if it works itself a little loose (no idea why that happened), it shorts the whole loving thing out.
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Aug 12, 2014 02:15
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kastein posted:A fire extinguisher is just gonna bounce off unless you hit it REALLY hard. The canisters are made from ~16ga aluminum. I've had a 1/2" ratchet bounce off an auto side window when I was trying to break it. I tossed a minimag in through the open driver's window...it bounced and broke the passenger window. Edit: Woah, that porcelain thing...what the gently caress? Godholio fucked around with this message at 02:31 on Aug 12, 2014 |
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Aug 12, 2014 02:25
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The porcelain thing works because safety glass has incredible surface tension built into it by the annealing/treating process. It holds up amazingly until you scratch the surface, creating a stress riser and blam, the glass shatters. The porcelain is harder than the glass and very sharp so it scratches/pierces the surface easily. This is how a rescue hammer works too, they are carbide tipped. The other way is to hit the glass on the edge. Safety glass edges are vulnerable.
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Aug 12, 2014 02:37
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Powershift posted:
I found a corolla like this at the yard this weekend. Front and back end just completely pulverized, engine trapped against the windshield in this bundle of twisted metal. Inside the cabin was totally normal. The only indication that something had happened was the blown airbags everywhere.
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Aug 12, 2014 02:49
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Powershift posted:
holy gently caress
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Aug 12, 2014 03:44
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They lived. Tm subaru.
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Aug 12, 2014 03:46
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Seat Safety Switch posted:That rollbar they weld into the middle of the unibody sure doesn't hurt. That's neat. Does everyone do this, or just Subaru?
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Aug 12, 2014 05:04
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xzzy posted:Isn't there a video floating around of someone smashing the ceramics on a spark plug and using that to shatter a side window? I forget the specifics of the technique but apparently the impossibly sharp edges that are produced make safety glass just fall apart. Breaking tempered glass is super easy with anything pointy, you just have to remember that glass is strongest at the center. Find something with a point, press it against the window, and smack it with the palm of the opposite hand. Before modern cars came with cool antennas, you used to be able to lay the antenna lengthwise along the glass, so the little ball on top was in the corner of the window. Pick the end of the antenna up, bend it like a bow, and let go.
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Aug 12, 2014 05:10
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Augmented Dickey posted:That's neat. Does everyone do this, or just Subaru? Just Subaru, as far as I know (though almost everyone seems to be going to high-boron steel for at least part of their unibodies, which should offer similar side-impact protection). They offer special guidance and training for firefighters to teach them how to cut through the frame with the jaws of life, but early on they didn't do that, leading to firefighters having to figure it out the hard way:  
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Aug 12, 2014 05:21
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kastein posted:The porcelain is harder than the glass and very sharp so it scratches/pierces the surface easily. the reason for this is that it's not porcelain, it's alumina (aka aluminum oxide, corundum, sapphires, etc.) 
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Aug 12, 2014 09:22
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Seat Safety Switch posted:Just Subaru, as far as I know (though almost everyone seems to be going to high-boron steel for at least part of their unibodies, which should offer similar side-impact protection). They offer special guidance and training for firefighters to teach them how to cut through the frame with the jaws of life, but early on they didn't do that, leading to firefighters having to figure it out the hard way: Yeah this makes a ton of sense why my B pillar didn't move but my C pillar section got what the gently caress owned.
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Aug 12, 2014 15:16
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Boaz MacPhereson posted:Sounds like a hell of a mechanical success to me. Engineering at work. Back seat passengers? gently caress 'em
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Aug 12, 2014 19:49
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Slavvy posted:Back seat passengers? gently caress 'em Once the kids get squashed, take that auto insurance payment right to the dealer and get a nice two-seater sports car.
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Aug 12, 2014 20:34
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inkmoth posted:Once the kids get squashed, take that auto insurance payment right to the dealer and get a nice two-seater sports car.
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Aug 12, 2014 20:44
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Installation is the reverse of removal:
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Aug 13, 2014 20:46
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   Random T-A that caught on fire next door last night   Never seen a set of digital calipers fail so that they display exactly half the actual value. The first picture is a .050" block and the second one is a 4" block.
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Aug 13, 2014 22:13
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rscott posted:
poor trans am
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Aug 13, 2014 23:16
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Crossposting from the GBS OSHA thread:
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Aug 14, 2014 02:47
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I think it's safe to say that's a total loss.
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Aug 14, 2014 02:52
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What the gently caress were they expecting?
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Aug 14, 2014 03:02
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Certainly not the truck equivalent of sucking your own dick.
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Aug 14, 2014 03:38
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Why would it fold like that anyways? I know they were expecting it flip end over end, but is the frame really that weak?
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Aug 14, 2014 03:45
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