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I thought it was weird because even bigger bucket-wheel excavators use treads (a whole lot of treads). But thanks for the explanations.luxury handset posted:the rocket pad crawler thing they use in spaceflight only has to go on a certain known route and you can pave that route The route is actually covered with specially optimized gravel quote:Each Crawlerway is 2 m (7 ft) deep and covered with Alabama and Tennessee river rock for its low friction properties to reduce the possibility of sparks.
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Jul 21, 2020 06:30
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GotLag posted:As an example, here's a tank destroying a cobblestone road (and jamming its tracks) by turning in place: The rocks disintegrating in the treads was amazing to watch. And then the dude pokes his hand in there... (Btw, what language is the audience speaking-?)
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Jul 21, 2020 07:19
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Tree Bucket posted:(Btw, what language is the audience speaking-?) German
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Jul 21, 2020 07:30
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If treads were better than walking then we’d have treads, not legs. Duh.
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Jul 21, 2020 07:34
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https://i.imgur.com/ZlgUEIw.mp4
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Jul 21, 2020 07:35
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Something something mecha anime.
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Jul 21, 2020 07:46
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Jul 21, 2020 08:32
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Inside a walking excavator as it moves. Very cool and more than a little unsettling. https://www.youtube.com/watch?v=9KOW36gNZtM&t=36s
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Jul 21, 2020 08:37
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even He-Man knew the truth https://www.youtube.com/watch?v=Nn14qt9wFE8
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Jul 21, 2020 09:01
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AceClown posted:even He-Man knew the truth Oh holy poo poo, I had that. I didn’t have any other He-Man related toys. Just that noisy monstrosity. It definitely could handle weird terrain, tho, including carpet, which is where most other moving toys would get tripped up, making this topic come full circle somehow.
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Jul 21, 2020 10:13
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Saw this in the local news.
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Jul 21, 2020 12:42
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he was 100% loving the woodchips
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Jul 21, 2020 12:44
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https://i.imgur.com/xbnnBoY.mp4 Thought for sure the pile of rocks was gonna finally get him after all that.
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Jul 21, 2020 14:07
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GotLag posted:As an example, here's a tank destroying a cobblestone road (and jamming its tracks) by turning in place: Oh God he's putting his hands in the track area to remove rocks
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Jul 21, 2020 14:17
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Cartoon Man posted:https://i.imgur.com/xbnnBoY.mp4 Fuuuuuuuuuuuck
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Jul 21, 2020 14:43
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https://twitter.com/KylePlantEmoji/status/1285367473064181761
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Jul 21, 2020 15:40
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Went to a trackday with a friend I haven't seen in years. Someone had weird noises coming from the diff so of course...
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Jul 21, 2020 17:01
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mobby_6kl posted:Went to a trackday with a friend I haven't seen in years. Someone had weird noises coming from the diff so of course... Lmao, quick way to crush your skull.
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Jul 21, 2020 17:12
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I mean, he could use a backup jackstand, but that's a pretty standard way to do quick oil changes / repair work on the underside of your car?
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Jul 21, 2020 17:21
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Bobulus posted:I mean, he could use a backup jackstand, but that's a pretty standard way to do quick oil changes / repair work on the underside of your car? a lot of people do the dangerous thing, yes
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Jul 21, 2020 17:23
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Bobulus posted:I mean, he could use a backup jackstand, but that's a pretty standard way to do quick oil changes / repair work on the underside of your car? To stick your body under your vehicle supported only by a single hydraulic jack stand and nothing else would seem insane to most safety minded people, myself included. I would never crawl under my car supported by only that.
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Jul 21, 2020 17:24
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Bobulus posted:I mean, he could use a backup jackstand, but that's a pretty standard way to do quick oil changes / repair work on the underside of your car? What? I'm very concerned that you feel working under something supported only by a jack is somehow "standard". You're putting your entire life in the hands of a single hydraulic cylinder not failing at an inopportune time, and no-one passing by accidentally bumping the release. The safe way to do it is to jack it up, lower it onto your jack stands, and remove the jack. The only time you can consider leaving it on the jack is if you're swapping a wheel or something and aren't actually going to be underneath it at any point.
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Jul 21, 2020 17:26
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Bobulus posted:I mean, he could use a backup jackstand, but that's a pretty standard way to do quick oil changes / repair work on the underside of your car? A jackstand is not a backup; it is the correct way to support the vehicle while you're working underneath. The jack is a lifting device used only to raise the car up enough to put it on the stands. Please consider that the jack is (1) explicitly designed to collapse, (2) on wheels, (3) cantilevered, with nothing preventing it from slipping off if the car shifts slightly away from the jack, and (4) sticking out from the car in a way that makes it easy to knock out of position. A jack is not a stand. A jack is only a lifting device.
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Jul 21, 2020 17:28
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Jabor posted:What? I'm very concerned that you feel working under something supported only by a jack is somehow "standard". You're putting your entire life in the hands of a single hydraulic cylinder not failing at an inopportune time, and no-one passing by accidentally bumping the release. I did mention a jack-stand. My logic (as told to me by my father) was always that you could either have just a jackstand, or a jackstand plus a second point of support, so the latter was better. I get why just the jack is a bad idea, but I guess I wasn't thinking about it being a busy environment. My bad.
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Jul 21, 2020 17:31
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Bobulus posted:I mean, he could use a backup jackstand, but that's a pretty standard way to do quick oil changes / repair work on the underside of your car? You never, EVER crawl under a car only held up by the hydraulic jack unless you long for death from having the breath crushed out of you or your skull crushed. Jackstands are a must. Even if you only have one. Even when totally closed, those jack valves tend to eventually start leaking, and there's a long list of people killed when their jack started very slowly lowering the car on top of them, or very quickly if the o-rings fail.
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Jul 21, 2020 17:32
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I would add any kind of jack. Anything that can lower a car can lower a car onto you. Only go under a car that is supported by something that can't be lowered without first taking the load off of it.
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Jul 21, 2020 17:36
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That's not really how your post came across. The problem with leaving it on the jack as a second point of support is that this "second point of support" is unreliable - if it fails, suddenly your vehicle is supported to a different degree in different places, which could make it shift or even fall off the remaining supports. But since you're probably just eyeballing this rather than rigorously measuring your setup, how do you know that the jackstands are even bearing any load at all? The reason you remove the jack entirely is so that you know the vehicle's weight is securely on the jackstands, and it isn't going to suddenly change.
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Jul 21, 2020 17:37
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Also, don't use a jack stand from harbor freight
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Jul 21, 2020 17:45
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For a long time, I used to imagine that a car falling on you would be like this: Then I read a few reports and actually it is a slow process where you can't move your ribcage and so take a breath. Which seems more terrifying to me.
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Jul 21, 2020 17:52
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Desert Bus posted:I know the bridge is ancient and seems strong but I seriously doubt it can take the weight of all those cathedrals. I just want you to know I got that and appreciated it.
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Jul 21, 2020 18:02
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minato posted:When you go to change the batteries on a hibernating bear's radio collar, make sure it's actually asleep. so how do collars charge? usb-A, micro, C, some new new standard , some ancient thing that only animal scientist use ?
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Jul 21, 2020 18:11
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PhazonLink posted:so how do collars charge? usb-A, micro, C, some new new standard , some ancient thing that only animal scientist use ? Batteries sized for the collar so you can swap them in the field without removing the collar.
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Jul 21, 2020 18:16
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What if they just turned the entire bear cave into an induction charger. Come on scientists, I thought you were smart.
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Jul 21, 2020 18:26
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Moo the cow posted:For a long time, I used to imagine that a car falling on you would be like this: It can be both!
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Jul 21, 2020 18:47
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PhazonLink posted:so how do collars charge? usb-A, micro, C, some new new standard , some ancient thing that only animal scientist use ? You just install the new battery rectally
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Jul 21, 2020 19:48
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Moo the cow posted:For a long time, I used to imagine that a car falling on you would be like this: Diaphragm chokes are a real thing in grappling competitions, also. For example, Dean Lister vs Josh Barnett. At the end of the match, Barnett gets Lister into basically a judo scarf hold. He then puts all his weight on Lister's chest and the compression between the two makes it so once Lister exhaled, he could not inhale again. It's a very different kind of choke than most people are used to, and Barnett made the big guy tap as a result. https://www.youtube.com/watch?v=fE2TC9-oEk4&t=1237s e: and Barnett explaining the choke step by step: https://www.youtube.com/watch?v=2s0VxxSNu-g
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Jul 21, 2020 20:00
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Bobulus posted:I mean, he could use a backup jackstand, but that's a pretty standard way to do quick oil changes / repair work on the underside of your car? I knew someone in high school who thought it was ok too. He has one less eye now because the jack failed.
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Jul 21, 2020 20:27
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Necrosaro posted:I knew someone in high school who thought it was ok too. He has one less eye now because the jack failed. Is his nickname 'One-eyed Jack'?
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Jul 21, 2020 20:47
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Facebook link https://www.facebook.com/OCSDMissionViejo/videos/615947049327675/ 
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Jul 21, 2020 20:58
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Jabor posted:That's not really how your post came across. I always lower the jack out of contact then pump it back up to just enough contact that friction is holding it in place. That way the stand is fully engaged but if it fractures under load there's some chance of the jack catching the car.
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Jul 21, 2020 21:02
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