WEBVTT - SYSK Selects: How Jackhammers Work 0:00:00.880 --> 0:00:04.480 Hey, everybody, this is Chuck here on a Saturday. It's beautiful, 0:00:04.559 --> 0:00:07.920 it's sunny. It's actually rainy and cold. But maybe by 0:00:07.920 --> 0:00:10.080 the time this rolls around it will be beautiful and sunny. 0:00:10.360 --> 0:00:12.760 But I know in February six two sixteen, it was 0:00:12.800 --> 0:00:17.079 not beautiful and sunny because we released an episode that 0:00:17.120 --> 0:00:20.040 has gone down and stuff you should know history as uh, 0:00:20.160 --> 0:00:23.600 from our point of view, quite possibly the most boring, 0:00:23.640 --> 0:00:27.120 worst one. So I thought I would pick this one 0:00:27.320 --> 0:00:30.440 and rerelease it into the world and just see if 0:00:30.440 --> 0:00:32.479 it's as bad as I thought it was. This is 0:00:32.479 --> 0:00:36.839 our very very infamous episode on Jackhammers. Yes, we did 0:00:36.880 --> 0:00:40.199 an entire episode on Jackhammers and here it is right now. 0:00:43.960 --> 0:00:46.240 Welcome to Stuff You should Know, a production of My 0:00:46.400 --> 0:00:55.120 Heart Radios How Stuff Works. Hey, welcome to the podcast. 0:00:55.200 --> 0:00:59.760 I'm Josh Clark. There's Charles w Chuck Bryant, and Jerry's 0:00:59.800 --> 0:01:02.800 over there, which means time for Stuff you should know. 0:01:03.400 --> 0:01:08.880 The Jackhammer edition coming at you. That's right, the most annoying, 0:01:09.760 --> 0:01:11.840 one of the most annoying sounds. And I know you 0:01:11.880 --> 0:01:15.720 hate the leaf blower. Yeah, it's established. I think the 0:01:16.480 --> 0:01:20.040 camera up there. Sure, yeah, but we don't live in 0:01:20.040 --> 0:01:21.840 New York if we lived in New York Jackhammer b 0:01:22.040 --> 0:01:24.200 number one. I feel like I've never stayed in a 0:01:24.280 --> 0:01:26.720 hotel in New York where there wasn't a jack below me, 0:01:27.680 --> 0:01:33.240 not even a chance. Every single time leaf blower. It's 0:01:33.240 --> 0:01:36.600 a lot more frequent down here in Atlanta than the jackhammer. 0:01:36.720 --> 0:01:38.080 Not a lot of leaf blowers in New York City, 0:01:38.760 --> 0:01:41.560 not a lot of leaves. Well, that's not necessarily true. 0:01:41.840 --> 0:01:44.679 You've been somewhere you are. Uh So we don't usually 0:01:44.880 --> 0:01:47.920 um shout out to thank you at the beginning of 0:01:47.920 --> 0:01:51.240 an episode, but we got a couple of gifts that 0:01:51.280 --> 0:01:55.360 are so special we want to do that. So Peter 0:01:55.440 --> 0:01:58.840 O'Donnell in the gang at built Sharp Knives b I 0:01:59.080 --> 0:02:03.880 l T Sharp out of Philly. H sent us, sent 0:02:04.000 --> 0:02:07.120 me a chef's knife, sent you a filet knife beat 0:02:08.000 --> 0:02:12.160 and it's one of the most gorgeous pieces of like 0:02:12.760 --> 0:02:17.600 handmade craftsmanship I've ever seen. It's amazing. I cannot wait 0:02:18.080 --> 0:02:20.320 to catch a fish. Oh dude, I can't wait for 0:02:20.320 --> 0:02:24.520 that for you cut that thing open, yeah, after it's dead. 0:02:25.800 --> 0:02:28.720 Uh really, you can't lock the head off while it's 0:02:28.720 --> 0:02:32.079 still alive. They think you're supposed to you're supposed to 0:02:32.120 --> 0:02:35.800 hit it with a hammer. I think some people do. Um, 0:02:35.880 --> 0:02:38.200 I do not. These things are gorgeous. I mean the 0:02:38.200 --> 0:02:40.519 blade itself, I mean the hand make these, the handle, 0:02:40.600 --> 0:02:43.520 the weight, it's just it's a piece of art. And 0:02:43.560 --> 0:02:46.560 not only that, it is the sharpest thing I've ever 0:02:46.600 --> 0:02:50.400 seen in my life. It's like dangerous. Um, but I 0:02:50.440 --> 0:02:53.680 don't want to you know, it's dangerous. They're knives. They're 0:02:53.680 --> 0:02:58.760 supposed to be sharp, but wield it with respect. Well yeah, 0:02:58.919 --> 0:03:02.840 well they're respectable. Live so um that you can actually 0:03:02.840 --> 0:03:06.360 go into tumbler. You can just search hashtag knives. You 0:03:06.400 --> 0:03:10.800 should know one word and it uh it chronicles and 0:03:10.919 --> 0:03:15.240 pictures and short captions or brief captions the process of 0:03:15.280 --> 0:03:17.720 them making our knives. It's awesome. Yeah, it's just really 0:03:17.720 --> 0:03:21.000 neat and I just love like handcrafting and forging steel, 0:03:21.160 --> 0:03:23.760 like those are lost arts in a lot of ways, 0:03:23.880 --> 0:03:26.119 and um, they're doing it right man, they're really beautiful. 0:03:26.200 --> 0:03:30.079 Cool man. So anyway, thank you, Yeah, thank you guys. Thanks. 0:03:30.360 --> 0:03:33.760 It was really cool. So jack hammers, yeah, jack hammers. 0:03:33.760 --> 0:03:36.520 If they were sharpest built sharp knives, they'd be onto something. 0:03:37.120 --> 0:03:39.720 But I don't know if it would work. Quite the same, 0:03:39.800 --> 0:03:43.960 Probably not so. Um, Yes, it's true we are actually 0:03:43.960 --> 0:03:48.080 talking about jack hammers, and yes, it's true that jack 0:03:48.120 --> 0:03:51.119 hammers are about what you think they are, but they're 0:03:51.160 --> 0:03:54.000 also kind of interesting when you start to look into them. Right. 0:03:54.040 --> 0:03:56.800 Oh yeah, well yes, so think about I didn't realize this. 0:03:56.920 --> 0:03:59.960 This article points it out. Jack hammer is a hammer 0:04:00.200 --> 0:04:05.080 and a chisel, but it's a hardcore hammer and chisel. Yeah, 0:04:05.120 --> 0:04:07.840 and it takes out of the equation largely the human 0:04:08.320 --> 0:04:12.040 who's back and shoulder muscles have to be involved in 0:04:12.120 --> 0:04:14.680 every single strike of that hammer and chisel. You're talking 0:04:14.800 --> 0:04:19.120 John Henry and the sledge hammer, Yes, exactly, because prior 0:04:19.240 --> 0:04:24.200 to the advent of the jackhammer about eight fifties, by 0:04:24.480 --> 0:04:27.760 the turn of the last century, we had jackhammers kind 0:04:27.760 --> 0:04:32.760 of down pat um. It was sledge hammers and pick 0:04:32.800 --> 0:04:37.520 axes to remove rock. It was a real deal that 0:04:37.640 --> 0:04:41.680 was like killed people like it literally could kill you 0:04:41.920 --> 0:04:44.320 with that kind of work. Yeah. I mean, mining is 0:04:44.520 --> 0:04:48.840 still a very dangerous job, but pre Industrial Revolution mining 0:04:49.600 --> 0:04:55.760 was no fun um, dangerous, deadly, and even if you 0:04:55.760 --> 0:04:59.839 didn't die, it's just brutal, brutal back baking work, baking work, slinging, 0:04:59.839 --> 0:05:03.440 as sledgehammer. Yeah, you ever slung a sledge it's the worst. 0:05:03.680 --> 0:05:06.800 It's it's hard work. You ever used the jackhammer? No, 0:05:06.839 --> 0:05:10.400 I haven't. It's awful. Well, that's the thing. It's better 0:05:10.440 --> 0:05:13.680 than the sledgehammer. Yeah, well in some ways. But it's 0:05:13.720 --> 0:05:16.640 brutally difficult. It is. It's probably one of the most 0:05:16.640 --> 0:05:19.839 brutal tools you can use on any kind of site 0:05:20.080 --> 0:05:22.520 and for any kind of project. There aren't that many 0:05:22.520 --> 0:05:24.440 tools that there. They're gonna take as much out of 0:05:24.440 --> 0:05:28.240 you as the jackhammers on your body. Yeah, because they 0:05:28.240 --> 0:05:31.600 weigh about a hundred pounds, like a normal heavy duty 0:05:31.720 --> 0:05:34.719 jackhammer weighs about a hundred pounds. You have to hold 0:05:34.720 --> 0:05:37.679 it in place upright, because you don't want to jumping around, 0:05:37.680 --> 0:05:40.200 although it's probably not going to anyway. It's it's designed 0:05:40.200 --> 0:05:43.400 not to jump around, but you still have to. Um. 0:05:43.560 --> 0:05:45.400 You want to kind of keep it in a fairly 0:05:45.440 --> 0:05:48.200 confined area, which means you're using your muscles to study 0:05:48.240 --> 0:05:51.760 it while it's going up and down at a very 0:05:51.880 --> 0:05:55.719 very fast rate. Some of those things UM impact with 0:05:55.800 --> 0:06:00.640 the ground one thousand to forty times a minute. It's tough. 0:06:00.680 --> 0:06:05.039 It's it's the only tool that and the hardwood floor, 0:06:05.839 --> 0:06:10.919 um skimmer, you know, like the orbital floor cleaner. You 0:06:10.920 --> 0:06:12.640 can use that on like put a standing pad on 0:06:12.680 --> 0:06:16.200 a hardwood floor, and that thing. And the sledge hammer. 0:06:16.240 --> 0:06:18.000 The only time I've ever used tools that I felt 0:06:18.040 --> 0:06:21.520 like we're controlling me and not me, not controlling the 0:06:21.560 --> 0:06:24.560 tool until you get it. Once you get it, it's 0:06:24.680 --> 0:06:26.920 a little better. But at first, when you first start 0:06:26.960 --> 0:06:30.479 to use it. You can rent a jackhammer, you know. Yeah, 0:06:30.480 --> 0:06:32.039 I mean, if you want to bust up your driveway, 0:06:32.080 --> 0:06:34.440 you can go do it yourself. If you're a fool, 0:06:34.760 --> 0:06:37.640 make sure that you don't need the driveway anymore before 0:06:37.640 --> 0:06:39.640 you do that. Yeah. Yeah. But um, once you get 0:06:39.680 --> 0:06:41.240 the hang of it, you kind of can wield it 0:06:41.240 --> 0:06:44.280 a little bit. But it's tough. I mean, it feels 0:06:44.320 --> 0:06:47.840 like I have no power or control over this thing, right, 0:06:47.920 --> 0:06:52.039 I can imagine you know. So, Um, it is a 0:06:52.120 --> 0:06:56.679 very difficult tool. But again, the alternative is early death, 0:06:57.680 --> 0:06:59.839 and the other alternative, which is to call someone to 0:06:59.839 --> 0:07:02.960 do it for you, is the best option of the three. 0:07:03.520 --> 0:07:07.919 But so say that you are um King Carlo Alberto 0:07:08.000 --> 0:07:11.880 of Sardinia and the years about eighteen thirty something, eighteen 0:07:11.960 --> 0:07:18.239 forty and you want a train tunnel built through a mountain, 0:07:18.520 --> 0:07:21.040 and the tunnel is gonna need to be twelve kilometers long. 0:07:22.600 --> 0:07:25.320 You do call somebody else, but that somebody else you 0:07:25.360 --> 0:07:28.480 call goes. I don't know what to tell you, buddy. 0:07:28.920 --> 0:07:31.040 We could try pick axes or whatever, but you're not 0:07:31.080 --> 0:07:33.480 still gonna be alive by the time we finished. What 0:07:33.560 --> 0:07:36.280 can we do? And actually this call for a twelve 0:07:36.360 --> 0:07:40.560 kilometer long tunnel through a mountain in Sardinia prompted the 0:07:40.680 --> 0:07:45.800 early um the early forays into developing pneumatic tools like 0:07:45.840 --> 0:07:48.560 a jackhammer. Yeah, in eighteen forty eight it got named 0:07:48.600 --> 0:07:52.720 Jonathan Couch built a what he called a percussion drill, 0:07:53.320 --> 0:07:56.240 and this had a bit that was it went through 0:07:56.360 --> 0:07:59.320 the piston of a steam engine, so it was piston driven. 0:08:00.240 --> 0:08:03.800 Then uh contemporary Joseph Foul actually attached it to the 0:08:03.800 --> 0:08:07.840 piston and then he started in eightf one using air 0:08:08.000 --> 0:08:11.720 which is pneumatic to power it. But these were still 0:08:11.760 --> 0:08:17.360 attached to a piston. And it wasn't until Charles Brady 0:08:17.440 --> 0:08:21.440 King when he actually has given credit for inventing the 0:08:22.320 --> 0:08:28.160 traditional looking handheld modern jack modern pneumatic powered jackhammer, right, 0:08:28.200 --> 0:08:30.080 and he gets a lot of credit for stuff that 0:08:30.440 --> 0:08:32.920 was already built. Like a lot of people say he 0:08:33.080 --> 0:08:35.800 was actually the inventor of the automobile. No he wasn't. 0:08:36.120 --> 0:08:38.920 Oh well, he was the inventor of the gasoline powered automobile. 0:08:39.120 --> 0:08:41.160 No he wasn't. He was the first guy in Detroit 0:08:41.200 --> 0:08:43.800 to build and drive one around. Yeah, and he did 0:08:43.960 --> 0:08:47.480 end up inspiring and mentoring Ransom Olds and Henry Ford 0:08:47.520 --> 0:08:50.920 and some other early car manufacturers and is almost single 0:08:50.960 --> 0:08:55.520 handily responsible for making Detroit motor city. This guy, but 0:08:55.600 --> 0:08:59.680 he also Stanley right? Uh? And what's from his eights? Freely? 0:09:00.200 --> 0:09:02.240 I like that guy's stuff? What do you mean didn't 0:09:02.240 --> 0:09:04.640 he get kicked out of Kiss? Oh? I think he 0:09:04.760 --> 0:09:08.760 was sort of not invited back. Yeah. I think it's 0:09:08.760 --> 0:09:11.280 a money move. They don't have to pay the nameless 0:09:12.120 --> 0:09:14.440 other guitar player nearly as well. He was a founder 0:09:14.440 --> 0:09:16.960 of the band. Right, How do you get kicked out 0:09:17.000 --> 0:09:20.000 like that for money? I think Paul Stanley and Jean 0:09:20.080 --> 0:09:28.360 Simmons probably own Kiss Incorporated. I know. Anyway, Um, Charles 0:09:28.400 --> 0:09:31.679 Brady King Uh, he put Detroit on the map as 0:09:31.679 --> 0:09:34.720 far as auto manufacturer goes. And he did do a 0:09:34.720 --> 0:09:37.920 lot of refining of pneumatic tools, including the jack hammer. 0:09:38.000 --> 0:09:39.559 And he does hold the pattern, he did hold the 0:09:39.600 --> 0:09:41.360 patent for it. Yeah, and he had been a lot 0:09:41.400 --> 0:09:44.520 of stuff. He was a sharp guy. And the pneumatic, 0:09:45.160 --> 0:09:48.480 the fact that it's pneumatic, which means air powered, compressed 0:09:48.520 --> 0:09:53.599 air powered UM is the reason why most jackhammers today 0:09:53.720 --> 0:09:59.360 are still compressed air powered. It's because of the mining 0:09:59.400 --> 0:10:03.800 application an it. Yeah, like when you mind, you're releasing 0:10:03.840 --> 0:10:09.280 a lot of potentially explosive gases and uh, you can't 0:10:09.320 --> 0:10:13.760 have something like a steam engine that's combustion powered down there, yeah, 0:10:13.880 --> 0:10:18.680 or you can't have an engine in there releasing exhaust. Um. 0:10:18.760 --> 0:10:24.160 And you can't have a jackhammer that will spark a rock. Um. 0:10:24.240 --> 0:10:26.959 Well that might happen no matter what. Right, Well, no, 0:10:27.080 --> 0:10:29.880 that's what I'm saying. You can't have that among volatile gases. 0:10:30.440 --> 0:10:33.920 So you've air driven is the perfect key, because it 0:10:33.960 --> 0:10:37.480 doesn't matter if that hoses a thousand feet long. You're 0:10:37.520 --> 0:10:40.240 not gonna lose power because it's gonna be Yeah, it's 0:10:40.240 --> 0:10:43.040 gonna be compressed air up against compressed air, and up 0:10:43.080 --> 0:10:45.720 on the surface. You've got a diesel engine that's powering 0:10:45.760 --> 0:10:48.200 a piston just like in your car, and the piston 0:10:48.280 --> 0:10:50.400 moves up and down the cylinder. As it moves down, 0:10:50.760 --> 0:10:54.120 it compresses the air in the cylinder and pushes it 0:10:54.160 --> 0:10:56.559 down into a storage tank where it sits a compressed 0:10:56.559 --> 0:10:58.680 air and that's released out the other end through the 0:10:58.720 --> 0:11:01.280 hose and it ends up into the jackhammer. And yeah, 0:11:01.320 --> 0:11:03.240 no matter how far away it is, it's still going 0:11:03.320 --> 0:11:08.000 to be just as powerful. And that compressed air is inflammable, 0:11:08.040 --> 0:11:09.719 so you can be a happy miner all the live 0:11:09.760 --> 0:11:12.600 long day. Well, buddy, you're getting excited, so that means 0:11:12.600 --> 0:11:15.120 we need to take a break and put this pill 0:11:15.200 --> 0:11:22.559 under your tongue and we'll come back right after this story. 0:11:37.600 --> 0:11:43.280 How you feeling now, relaxed? Good? I love the title 0:11:43.320 --> 0:11:47.679 of this next section, Air powered destruction. Um, you can 0:11:47.800 --> 0:11:50.880 get an electric jackhamer. If you've ever gone to a 0:11:50.920 --> 0:11:55.959 hardware store, they have these kind of smaller handheld jack 0:11:55.960 --> 0:11:59.200 hammers that, um, you can take up like your bathroom 0:11:59.240 --> 0:12:02.199 floor tile pretty well with it plugging into the wall. 0:12:02.800 --> 0:12:05.959 Has a little chisel bit on the end of it. Um, 0:12:06.080 --> 0:12:10.040 But that's small. Beans. You can't do a driveway or 0:12:10.120 --> 0:12:12.319 concrete or asphalt with with something like that, or a 0:12:12.400 --> 0:12:15.360 twelve kilometer tunnel through a mountain in Sardinia. No, you 0:12:15.400 --> 0:12:19.280 need the big T shaped jack camera. And here's one 0:12:19.320 --> 0:12:21.439 of the things that didn't really occur to me. One 0:12:21.480 --> 0:12:24.040 of the reasons it works so well is because it's 0:12:24.040 --> 0:12:26.920 so heavy. Right. It's not like things say, well, let's 0:12:26.920 --> 0:12:29.480 make this thing way fifteen pounds or twenty pounds to 0:12:29.559 --> 0:12:32.200 make it easier to run, which they probably could. Yeah, 0:12:32.240 --> 0:12:34.320 you maybe could do that, but it would jump all 0:12:34.320 --> 0:12:36.360 over the place. Yeah, you want that thing super super 0:12:36.360 --> 0:12:39.040 heavy because that's part of the power and forced behind it. 0:12:39.080 --> 0:12:41.400 That's right. So these things are pneumatic, right, And just 0:12:41.440 --> 0:12:46.000 like on the compressed air compressor up on the surface 0:12:46.040 --> 0:12:48.680 when you're done in the mine, they actually have a 0:12:48.840 --> 0:12:53.000 jackhammer has a piston in a piston in a cylinder 0:12:53.040 --> 0:12:56.440 in it, right, Okay, And it's it's actually a really 0:12:56.520 --> 0:12:59.520 kind of simple when you cut the thing open and 0:13:00.200 --> 0:13:02.960 draw a cross section of it, which we did, yeah, 0:13:03.160 --> 0:13:07.640 on our hands for crib sheets. Um you you you 0:13:07.679 --> 0:13:10.160 can see that. Really the whole mechanism comes down to 0:13:10.440 --> 0:13:14.040 a trigger valve, right, that's right. So what you have 0:13:14.080 --> 0:13:16.560 here is you got the pressure chamber. The compressed air 0:13:16.679 --> 0:13:20.760 enters that chamber activates the trigger valve. And it just 0:13:21.320 --> 0:13:24.000 because of the compressed air opens and shuts really fast, right, 0:13:24.040 --> 0:13:27.760 and so the trigger valve moves the air either above 0:13:27.800 --> 0:13:31.360 the piston or when it closes, the air goes down 0:13:31.520 --> 0:13:35.160 below the piston, which means chisel goes up, chisel goes down, right, 0:13:35.160 --> 0:13:39.160 because the piston is striking the top of that chisel bit, 0:13:39.360 --> 0:13:42.200 driving it downward when the compressed air comes in and 0:13:42.200 --> 0:13:45.839 pushes the piston down. And then when the valve closes 0:13:46.200 --> 0:13:48.760 and the air goes underneath the piston, there's also a 0:13:48.800 --> 0:13:52.000 spring in there that brings the drill bit back up. 0:13:52.240 --> 0:13:55.240 Because it wouldn't work very well if you knock it down. 0:13:55.520 --> 0:13:57.600 They had to go down and reset it. And apparently 0:13:57.920 --> 0:14:03.280 the earliest um, the earliest Jackhammeer had that very designed 0:14:03.400 --> 0:14:06.520 that feature. That was it like it go bam and 0:14:06.559 --> 0:14:09.079 then you definitely like reset it bam and then reset 0:14:09.080 --> 0:14:11.400 it and they're like, this isn't gonna work. Yeah, that's 0:14:11.440 --> 0:14:16.440 sort of like the pneumatic cattle punch that they that 0:14:17.120 --> 0:14:19.120 what's his face used in no Country for old men. 0:14:19.560 --> 0:14:22.360 One way, it's exactly like that. Not very good if 0:14:22.360 --> 0:14:24.960 you're trying to bust up concrete, but good if you 0:14:25.000 --> 0:14:28.360 want to put on a cow. That's right. It doesn't 0:14:28.360 --> 0:14:31.360 stunn them. It does the eternal stunt. I think it 0:14:31.520 --> 0:14:35.280 stuns a cow and then they kill them. Oh I 0:14:35.320 --> 0:14:37.520 thought it they put it into the brain to kill 0:14:37.560 --> 0:14:39.880 the cow. I don't think it actually. I think it 0:14:40.000 --> 0:14:42.600 can and probably does sometimes, but I think the main 0:14:42.640 --> 0:14:44.760 purpose of it is to stun the cow, so it's 0:14:44.800 --> 0:14:47.200 not like it's just dazed and out of it when 0:14:47.240 --> 0:14:51.320 it when it, they kill it. Oh yeah, yeah. Uh. 0:14:51.680 --> 0:14:55.600 Hydraulic jackhammers, it's the same. Uh jackhammer would kill a cow. 0:14:57.040 --> 0:15:01.160 Hydraulics use fluid, same principle, but it doesn't use air. 0:15:01.360 --> 0:15:04.640 And if you've ever seen the they have jackhammers you 0:15:04.640 --> 0:15:07.040 can that are really large that you can't handle as 0:15:07.280 --> 0:15:09.800 a person, but it's like attached to a backhoe or 0:15:09.840 --> 0:15:12.840 something that's for big, big jobs. And those are usually 0:15:13.040 --> 0:15:16.440 um hydraulic and pneumatic. Right, but probably not every time. 0:15:17.320 --> 0:15:19.960 I'm sure someone in the construction industry will correct me 0:15:20.000 --> 0:15:22.040 on that. Well. I went and looked, and if you 0:15:22.120 --> 0:15:25.760 go on Alibaba that you know that's I has everything 0:15:26.360 --> 0:15:29.720 and they have hydraulic jack hammers for sale. What's ali 0:15:29.760 --> 0:15:33.560 baba is that like Skymall. It's like China's Amazon, but 0:15:33.680 --> 0:15:38.520 they sell everything on it. It's nothing like Skymall. Do 0:15:38.600 --> 0:15:41.120 you think everything's like skymallers because you want a skymall 0:15:41.200 --> 0:15:44.400 to come back? I sure do. Um, but they it 0:15:44.520 --> 0:15:47.760 did seem like all of the back hoe attached um 0:15:47.960 --> 0:15:53.600 jack hammers were hydraulic that I saw. Okay, all right, well, um, 0:15:53.760 --> 0:15:58.200 here's what happens at a thousand hits per minute. That 0:15:58.320 --> 0:16:01.480 chisel bit and if you're breaking up rock. They're different 0:16:01.520 --> 0:16:04.160 kinds of bits. A pointy bit if you're breaking up 0:16:04.200 --> 0:16:07.320 like a driveway or something is really good, or you 0:16:07.360 --> 0:16:10.440 can use a flat bit for other applications. So yeah, 0:16:10.480 --> 0:16:12.400 if you're breaking up a driveway and all you want 0:16:12.480 --> 0:16:14.960 is for the driveway to go bye by, Yeah, the 0:16:15.040 --> 0:16:17.080 pointy bits the one you want because it's not a 0:16:17.120 --> 0:16:22.040 controlled cut. The the the like a flathead screw driver 0:16:22.200 --> 0:16:24.720 style bit is the kind that where you can really 0:16:24.800 --> 0:16:27.800 kind of control where the cracking goes right or if 0:16:27.840 --> 0:16:30.320 you wanna, uh, like I said, if you're taking up 0:16:30.320 --> 0:16:32.960 your floor tile and you have the handheld version, that's 0:16:33.000 --> 0:16:35.640 what you want to scoot it underneath the tile and 0:16:35.720 --> 0:16:38.720 chip it up and there's actually there's like, um, some 0:16:39.480 --> 0:16:43.880 insane mathematicians have actually like tried to figure out how 0:16:43.920 --> 0:16:48.600 you can predict how cracks propagate. Yeah, there's like um 0:16:48.640 --> 0:16:51.800 for the most efficient jackhammering pretty much like what bit 0:16:51.880 --> 0:16:53.840 will work best, and like where to place it and 0:16:53.880 --> 0:16:56.840 how to how to use it. But um, one of 0:16:56.880 --> 0:17:00.880 the things that I didn't understand before is that when 0:17:01.080 --> 0:17:06.560 you are jackhammering, you you are creating different types of 0:17:07.320 --> 0:17:13.160 uh uh flaws basically in this solid say, concrete structure, right, 0:17:13.640 --> 0:17:15.800 And when you're doing that, the first flaw you're doing, 0:17:15.840 --> 0:17:18.679 the first flaw you're creating is this um kind of 0:17:18.760 --> 0:17:22.479 surface powder that the the initial chips you're making are 0:17:22.520 --> 0:17:27.240 actually powder izing and and congealing around the drill bit, right, 0:17:27.520 --> 0:17:32.760 And that powder actually transmits the impact of the jackhammer 0:17:33.280 --> 0:17:36.840 throughout the rest of the concrete pad in that immediate area, 0:17:37.200 --> 0:17:40.119 and that actually starts to create cracks. So you think, well, 0:17:40.920 --> 0:17:43.359 it's just the drill bit creating crack. It gets in 0:17:43.400 --> 0:17:47.440 there enough. Actually no, it's it's generating like these different 0:17:47.480 --> 0:17:51.400 materials from the very concrete itself, and it's using those 0:17:51.400 --> 0:17:56.040 materials to distribute the force and create cracks that ultimately 0:17:56.080 --> 0:17:59.240 start to spread and propagate, and as they spread and propagate, 0:17:59.320 --> 0:18:01.520 they get bigger and bigger, and then a chip comes off. 0:18:01.920 --> 0:18:04.240 And when the chip comes off, the amount of force 0:18:04.280 --> 0:18:06.960 that's generated and there goes down again and you have 0:18:07.000 --> 0:18:09.359 to build it back up by more jackhammering. But eventually 0:18:09.600 --> 0:18:12.680 these larger cracks that you're making come together and then 0:18:12.760 --> 0:18:15.960 big chunks break off. And then when a big chunk 0:18:16.000 --> 0:18:18.600 breaks off, you want somebody to come in and clear 0:18:18.640 --> 0:18:21.600 the chunks away while you move the jackhammer, because you're 0:18:21.600 --> 0:18:23.760 just gonna be breaking up those chunks. And that's not 0:18:23.840 --> 0:18:26.280 the point of jackhammer anymore. Now. The point is you're 0:18:26.320 --> 0:18:30.480 trying to remove whatever material in his bigger pieces as 0:18:30.640 --> 0:18:34.359 can be removed, you know, right, like by like a 0:18:34.359 --> 0:18:37.720 bacco with a bucket or something. Um. Obviously it can't 0:18:37.720 --> 0:18:39.159 be too big because you might have to break up 0:18:39.160 --> 0:18:41.720 in a smaller bits. If you don't want a three 0:18:41.760 --> 0:18:43.919 million little tiny rocks at the end of it, right, 0:18:43.920 --> 0:18:46.600 you're not breaking it into gravel. No, the machines that 0:18:46.720 --> 0:18:52.040 do that. Um, some of these things actually when when 0:18:52.040 --> 0:18:54.760 you create a crater, that's good, but you don't want 0:18:54.800 --> 0:18:57.680 your crater full of junk. So some of them actually 0:18:58.119 --> 0:19:01.880 have air water that blast the stuff clear as you're going, 0:19:02.520 --> 0:19:05.120 which is pretty neat too, Yeah, which is a it's 0:19:05.160 --> 0:19:08.880 a big that's an issue because the stuff that that 0:19:09.000 --> 0:19:13.320 dust that accumulates that forms what's called the crushed zone, 0:19:13.400 --> 0:19:18.560 that powder that distributes the force um is actually can 0:19:18.600 --> 0:19:20.760 be a health hazard. And there's actually a lot of 0:19:20.800 --> 0:19:24.320 health hazards with jack hammers. Uh. And we'll talk about 0:19:24.359 --> 0:19:47.119 them right after this, all right, Josh, health hazards of 0:19:47.200 --> 0:19:52.159 jackhammering um that dust is no joke. Well, before we 0:19:52.240 --> 0:19:54.240 go to health hazards, let me say this. What you 0:19:54.960 --> 0:19:56.760 and actually can be a health hazard. It can be 0:19:56.840 --> 0:20:00.479 dangerous when you get your bits stuck. Uh. And the 0:20:00.520 --> 0:20:02.880 general rule of thumb is you don't want to put 0:20:02.960 --> 0:20:05.960 the bit farther down. You don't want to keep going 0:20:06.040 --> 0:20:09.040 down farther than the length of the bit, because if 0:20:09.040 --> 0:20:11.240 you get your bit stuck, then it's really tough to 0:20:11.240 --> 0:20:13.800 get back out. Yeah. And while it may give you 0:20:13.840 --> 0:20:16.960 a little break, your boss didn't gonna be happy, or 0:20:17.000 --> 0:20:19.160 if you're renting that thing by the hour at your house, yeah, 0:20:19.240 --> 0:20:21.560 you're not gonna be happy. Yeah, because you just used 0:20:21.600 --> 0:20:24.200 all of the force of that compressed air to jam 0:20:24.280 --> 0:20:30.400 that that chisel bit several inches into concrete. Yes, it's not. 0:20:30.920 --> 0:20:33.000 You need like King Arthur to get that out. Yeah, 0:20:33.040 --> 0:20:35.879 so move it around, um inches at a time so 0:20:35.920 --> 0:20:38.159 it doesn't go straight down into one spot. And you 0:20:38.240 --> 0:20:40.960 want a sharp bit as well. Obviously a dull bit 0:20:41.119 --> 0:20:42.840 is gonna get stuck easier and it's not going to 0:20:42.920 --> 0:20:47.159 break up the material as well. Um. And like you 0:20:47.200 --> 0:20:50.800 said at the beginning that the jackhammers one of the 0:20:50.840 --> 0:20:53.679 noisiest tools around, it's the worst. It might be the 0:20:53.840 --> 0:20:59.720 noisiest tool. Jack hammers um create a noise at about 0:21:00.080 --> 0:21:03.240 hundred and thirty decibels from why this article says, Yeah, 0:21:03.320 --> 0:21:06.320 that is the that is the sound of a jet 0:21:06.320 --> 0:21:10.520 engine taking off. That's how that's how loud those things 0:21:10.520 --> 0:21:14.240 are and driving here, no joke. I passed a dude 0:21:14.640 --> 0:21:18.160 using a jack camera, huh. And he wasn't wearing your protection, 0:21:18.359 --> 0:21:19.760 you know. I was just about to say, is I 0:21:19.800 --> 0:21:24.160 bet you've never seen a jackhammer operator not use your protection? 0:21:24.920 --> 0:21:27.480 I never have until today. That's nuts. Isn't that a 0:21:27.520 --> 0:21:31.359 weird coincidence? Though? It is totally weird and like just dumb. 0:21:31.520 --> 0:21:36.000 He's like screwed, I got health insurance. Uh, construction headphones 0:21:36.040 --> 0:21:38.919 are a must. Um. And because we're talking about how 0:21:38.960 --> 0:21:41.119 how much it wears you out. If you're on a 0:21:41.240 --> 0:21:46.040 road crew, Um, you're probably gonna be rotating out jackhammer duty. Yeah, 0:21:46.080 --> 0:21:49.120 it's not like Chuck, You're on the jackhammer for ten 0:21:49.160 --> 0:21:52.320 hours today for the rest of your life. Yeah. Yeah, 0:21:52.320 --> 0:21:55.040 And it's a it's a real thing. Like people who 0:21:55.320 --> 0:22:00.240 use jackhammers as their profession, they do face a lot 0:22:00.280 --> 0:22:03.600 of problems. That dust is you know already mentioned that, 0:22:03.640 --> 0:22:06.439 but concrete has a silica and that's been proven to 0:22:06.520 --> 0:22:10.080 cause lung cancer. And so a lot of these jackhammers 0:22:10.080 --> 0:22:12.919 will have a like a water sprayer at the end 0:22:12.960 --> 0:22:16.080 of them that just constantly is introducing water that keeps 0:22:16.160 --> 0:22:19.320 the dust on the ground and like a puddle. All right, 0:22:19.359 --> 0:22:21.479 And what's the different or the deal with this. I 0:22:21.520 --> 0:22:23.479 know you didn't get a chance to look at it, 0:22:23.520 --> 0:22:27.679 but you sent a pretty interesting thing on the negative 0:22:27.680 --> 0:22:30.399 effects of vibration on the human body. Yeah, it's weird. 0:22:30.840 --> 0:22:34.160 What's the deal there? So vibrations are very odd. They 0:22:34.240 --> 0:22:38.000 used to belong in the realm of Eastern Europe behind 0:22:38.040 --> 0:22:40.520 the Iron Curtain. They did a lot of research in 0:22:40.920 --> 0:22:44.040 the effects of vibration on the body, and it does 0:22:44.080 --> 0:22:49.920 everything from cause insomnia to digestive issues to motion sickness. 0:22:50.000 --> 0:22:51.960 And this is bad vibration. I mean there's also like 0:22:51.960 --> 0:22:56.240 good vibration. There's also good, good, good vibration. There's there's 0:22:56.320 --> 0:23:01.639 vibrations that that that that vibrated a certain frequency certain 0:23:01.720 --> 0:23:03.640 hurts and I don't remember what it is, but it's 0:23:03.640 --> 0:23:07.720 like a low it's like a low frequency vibration. And 0:23:08.119 --> 0:23:12.800 there's there's something called whole whole body vibration which UM 0:23:12.840 --> 0:23:15.560 apparently GM is dealing with a problem right now. They 0:23:15.560 --> 0:23:20.840 have like their their largest UM I guess maybe they're 0:23:20.880 --> 0:23:24.439 Tahoe or something, but they're large SUVs. They had to 0:23:24.520 --> 0:23:28.640 really strengthen the cage so that if it rolled over, 0:23:28.680 --> 0:23:32.000 it wouldn't crush the bottom of the truck, wouldn't crush 0:23:32.040 --> 0:23:35.680 the roof. But the thing is so rigid that when 0:23:35.680 --> 0:23:38.879 it goes at like highway speeds, it vibrates at this 0:23:38.880 --> 0:23:42.880 this frequency that's perfect, and it's giving the driver's motion sickness. 0:23:43.320 --> 0:23:45.760 So yeah, there's all this weird stuff that happens from 0:23:45.880 --> 0:23:49.879