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Fifty Three posted:I don't think my brain is properly appreciating the scale of that thing. Same, what is the diameter of the piece being worked? I get that it's massive as a motherfucker, but knowing the size would help. e: is it more than a meter in diameter? Holy poo poo, please don't say yes.
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May 22, 2014 05:39
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The chuck itself is 1600mm so yeah that workpiece is a big fuckin' piece of metal. Taking .750 cuts with a lathe is no mean feat either, those chips must come off the workpiece practically molten. Unless he's talking .750mm which is somewhat less impressive  Mother of god that must have shaken the whole building when it came unglued.
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May 22, 2014 06:24
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It says it's capable of holding up to 1600mm, and the chunk of metal looks like it might be taking up around half of the turntable.. So maybe about a meter across? Give or take.
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May 22, 2014 06:24
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Oh gently caress I read that 1600mm as 160.0mm. Joining the  crew then, thanks.
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May 22, 2014 06:35
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kastein posted:jesus christ At my former university, the physics lab had some sort of flywheel device blow up thanks to a hairline crack in the rotor. I don't remember the exact numbers, but the rotor was about the size of a beer keg and it spun well over 100,000 RPM. It let go while they were still spinning it up, so it hadn't reached maximum energy yet. The 250-pound steel "containment" cover of the machine was launched through the ceiling of the lab into the classroom above, and they later found shrapnel from the incident in a parking lot more than two hundred feet away.
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May 22, 2014 06:48
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Noeland posted:Not too horrible, but this is what a decade of cavitation looks like.
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May 22, 2014 07:06
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Fire Storm posted:What was the reason for service or replacement? Was it working just fine and it was decided to remove it for maintenance and saw the damage? Nah, the pump shat itself and we found the pitting after we pulled it off. Short story a littler longer: We replaced a check valve on the suction side of the pump, the spring on the old one corroded away letting the system to drain back into the sump and lose its prime when it was shut down. With the new check valve in place, the suction head on the pump was just too much for that impeller and the pump cavitated for several hours as soon as the water got warm enough. Cavitate a pump long enough and the motor will burn out. So now because we fixed a 100 dollar valve we have to replace a whole $8000 pump. This kind of thing has been par for the course lately due to our current team of operators/maintenance personnel actually doing their jobs. Its amazing how long some of the equipment around here has lasted with the kind of neglect that it has seen.
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May 22, 2014 07:51
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Noeland posted:So now because we fixed a 100 dollar valve we have to replace a whole $8000 pump. I loving love this kind of bullshit. We've recently had new owners come in, and start replacing stuff that's been running past it's prime for years, if not decades. We'll replace one thing, it will break two other things, and they'll get pissy. "Why did you do that? It was working fine before!" No! It was not working fine before! It was two coughs and an ant-fart from bringing down loving everything, and the failure that did occur was an order of magnitude less catastrophic than what would have happened if we didn't do poo poo at all! 
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May 22, 2014 07:59
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Nothing to major but my st185 celica gt4. Destroyed its rear diff recently. It's had a. Fir bit of abuse over the years. Engine making 300kw at all 4. Sad part was. Was just driving when this happened. No shenanigans involved Looks like the center cracked and allowed all the spider gears to strip themselves Got a st 205 diff to replace it I popped the cover off the old one so heres some blurry carnage shots   
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May 22, 2014 10:36
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kastein posted:jesus christ https://www.youtube.com/watch?v=736O4Hz4Nk4&t=165s edit: here's nine minutes of a man with a soothing voice talking about rotors https://www.youtube.com/watch?v=L3MK8Euz3HQ atomicthumbs fucked around with this message at 11:18 on May 22, 2014 |
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May 22, 2014 11:06
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Fucknag posted:I did not catch the 7,000 pounds bit the first time around. Kind of makes me sad the gyrobus never caught on. A 6600lb flywheel spinning at 3000 RPM, the outer edge of which is traveling at 560mph driving down the road in a vehicle loaded with fleshy humans. What could be more exciting than that? Even better, if the flywheel is mounted horizontally, the bus could do a wheelie if the flywheel was at full speed and you crested a hill!
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May 22, 2014 11:20
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Powershift posted:Even better, if the flywheel is mounted horizontally, the bus could do a wheelie if the flywheel was at full speed and you crested a hill! Very stable ride! *nodnod*
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May 22, 2014 11:57
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atomicthumbs posted:edit: here's nine minutes of a man with a soothing voice talking about rotors That is one soothing-rear end voice edit: Thanks, Bill O' Connor an AOL chatroom fucked around with this message at 15:25 on May 22, 2014 |
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May 22, 2014 15:14
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Sagebrush posted:At my former university, the physics lab had some sort of flywheel device blow up thanks to a hairline crack in the rotor. I don't remember the exact numbers, but the rotor was about the size of a beer keg and it spun well over 100,000 RPM. It let go while they were still spinning it up, so it hadn't reached maximum energy yet. A few years ago at Texas A&M one of the big liquid nitrogen dewars let go because at some point along the line some genius had replaced the relief valve and the rupture disk with pipe plugs.   I like that it stripped the tile off the floor.
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May 22, 2014 15:30
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Liquid nitrogen actually cleans linoleum really nicely, you just splash it down and it sorta flash-freeze-flushes everything off. We used to use that to clean the kitchen floor in my college apartment. It doesn't take go-kart burnout marks up though, because they melt into the floor wax.
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May 22, 2014 16:09
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Oh are we talking nerd failures now? Here's one from the Tevatron (the retired particle accelerator at Fermilab): That piece of metal with a hole in it is tungsten, which melts at 3400 degrees celsius. The hole was made by the device holding the tungsten being unintentionally inserted into the beam. Layman's backstory is there was movable sensors installed on the accelerator for collecting data. These sensors needed to be super close to the beamline, within millimeters. So they had a lot of precision hardware to position close to the beam and get their data, but the engineers didn't pay as close attention to the retraction process. If the device fully retracted and hit a limit switch, it would enter a failure mode and fully extend.. right into the beam line. In this case they believe it failed because a LVDT gave a bad reading and multiple retract commands were sent to the device, causing it to hit the limit switch and trigger a full extension. The fix? Along with circuitry repairs to address the failure condition, they installed this high tech solution:  A hard stop to prevent it from extending into the beamline again. The whole incident is known as the "16 house quench." A quench is when the temperature of superconducting magnets raises to the point they're not superconductive anymore, and safety systems engage to dump the massive amounts of current before the sudden resistance causes the magnet to burn itself up.. this has to happen in under a second. A "house" is a structure on the ring that contains the cryogenic cooling equipment to cool the magnets, each house cools 40 magnets and there's 24 of these houses. So quenching "16 houses" means well over half the four mile ring had to shut down in fractions of a second. I've never heard exactly how much the failure ended up costing but the rumor has always been it was in the millions. I wasn't on site when it happened but apparently it made a lovely boom when the liquid helium suddenly warmed up and sought a path to atmosphere.
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May 22, 2014 16:35
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I'm sure everyone here knows about 24 Hours of Lemons. I guess this could be both a mechanical triumph and failure at the same time. http://jalopnik.com/5524236/never-give-up-one-cylinder-fiero-one-speed-thunderbird Included is the description of an Iron Duke-powered Fiero, a 1.25 liter 2-cylinder engine, and a direct drive one speed transmission.
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May 22, 2014 18:13
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Amykinz posted:I'm sure everyone here knows about 24 Hours of Lemons. I guess this could be both a mechanical triumph and failure at the same time. Those were some absolutely heroic bodge-jobs 
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May 22, 2014 18:20
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KozmoNaut posted:Those were some absolutely heroic bodge-jobs My favorite is how the plugs from the wasted cylinders kept igniting the crankcase gasses and blowing the oil pan gasket, they didn't want to just remove them and change the resistive load to the coil, so they ran them to the trunk.
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May 22, 2014 18:26
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This was in the lemons race a couple years ago: https://www.youtube.com/watch?v=Cxqq22sD67A I think it did like 4 laps in two days.
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May 22, 2014 18:59
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So I had this terrible dream last night, where I went to check the oil on my BMW and everything I touched became a BL product. The rust...the endless rust... What does it mean?
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May 23, 2014 01:55
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Vindolanda posted:So I had this terrible dream last night, where I went to check the oil on my BMW and everything I touched became a BL product. The rust...the endless rust... You must acquire the finest piece of BL machinery listed on Craigslist at the moment and slay the demons of rust and shoddy build quality. It's destiny
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May 23, 2014 02:36
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That lathe hold down failure video made me cringe. I'd be cleaning my shorts for a week if I was near that bastard letting go. Even a fairly standard-sized lathe has a massive amount of rotational energy, and fixture failures are always terrifying. A lot of older engine lathes use a large threaded end on the spindle to hold the chuck on the machine. More modern lathes tend to use something like a cam-lock system, but the older style is just hilariously dangerous waiting to happen. When the machine runs a 12" diameter steel chuck up to speed and the operator suddenly drops it into reverse, you know what happens? The chuck keeps wanting to spin the original direction and unthreads. And if it comes off the machine, it's not going to stop if it runs over your foot, the tool cart, and probably the wall. There's a lot of machninist horror stories of this kind of thing happening. Hell, at the college I went to an experienced instructor admitted he almost did this one day. He was in the shop trying to bang out a personal project before his classes, and was using one of the older thread-on Leblond lathes. He dumped the machine into reverse from full forward, and said he noticed "something odd" and shut the machine down. When he looked he said the chuck had unthreaded itself about an inch off the spindle.
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May 23, 2014 19:29
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Amykinz posted:I'm sure everyone here knows about 24 Hours of Lemons. I guess this could be both a mechanical triumph and failure at the same time. I am sitting in the pub giggling like a maniac. This is beautiful.
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May 23, 2014 19:34
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kastein posted:It doesn't take go-kart burnout marks up though, because they melt into the floor wax. This is now the baseline measurement for any cleaning products I may need in the future. "Yes, it seems really great, but will it...?"
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May 24, 2014 03:52
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I think my Big end bearings have seen better days... Still made 38psi of oil pressure hot! 
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May 24, 2014 05:24
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1hdt?
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May 25, 2014 10:44
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1HD-FTE... I cooked it 
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May 25, 2014 11:08
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Ooh. Bummer. I didn't think they suffered the big end problem or is there more to the story. I still want one to shove in my 80. 1hz is making GBS threads me these days.
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May 25, 2014 11:31
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Realistically they don't- the HD-T shat big ends with alarming recurrence, the HD-FT used to lose valve retainers if you didn't follow the adjustment procedure EXACTLY to the letter but the FTE motor had them all ironed out. What caused that on mine was dunking it into a bog hole, clogging the radiator solid and then having to spend several hours in a mild overheat driving to the nearest water supply to get enough water to wash the radiator out enough to stop an overheat. I absolutely cooked the poo poo out of the oil - Killed the turbo bearings too. I think I'll be doing a light overhaul on this engine around the 250K mark, mostly to replace bearings since it's a girdle crank you can't just easily drop the main bearings caps and swap them out.
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May 25, 2014 14:05
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Acid Reflux posted:This is now the baseline measurement for any cleaning products I may need in the future. "Yes, it seems really great, but will it...?" If you ever need to get tire marks from winter tires out of cork kitchen flooring, use orange cleaner AND generic magic erasers in combination.
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May 25, 2014 15:07
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Jeherrin posted:I am sitting in the pub giggling like a maniac. This is beautiful. quote:Every time you remove a piston, you need some way of blocking the flow of oil to that journal on the crank. Strips from a pop can and a hose clamp around the journal works fine.
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May 25, 2014 15:22
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Rev. Dr. Moses P. Lester posted:Some great stuff in there.
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May 26, 2014 13:36
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This is one of the more impressive punctures i've seen!  
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May 26, 2014 14:29
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Holy poo poo! That's a railroad spike, isn't it?
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May 26, 2014 14:32
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I bet that made a noise. Shortly following by a slightly wetter noise in the driver's underpants.
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May 26, 2014 14:37
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Sure is a railroad spike. Into a Toyota prado tyre at around 100kph on ball bearing iron stone gravel by the looks of that photo. I'd love to see the face of the tyre bloke when you rolled in with that!
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May 26, 2014 14:57
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I don't think I'd even bother except as a "hey will ya look at that!" show and tell type thing... nothing salvageable in that picture! Did the end of the spike end up behind the brake rotor and hold the whole wheel captive, or have a party with the caliper, brake line, and suspension/steering parts? Because it looks like it could have, and that's the only way I can think of that things could be worse. So it probably happened.
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May 26, 2014 15:28
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Who was it here that did that to an L322 Range Rover?
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May 26, 2014 15:42
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Noeland posted:Not too horrible, but this is what a decade of cavitation looks like. Discharge cavitation. Someone needs to increase their filter PM's.
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May 26, 2014 19:50
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