Went to service a 2 year old wharf side loading crane found the untouched grease gun supplied with it still in the packaging, no grease on the slew ring rocking like grandpas old porch chair £30,000 later a new slew ring installed for the lack of £20 worth of grease.
It's rarely the $100,000 bits that fuck up on their own. It's the $10 bits no one could be arsed caring about. See: the amount of pilots on stations and out in the bush that will spend $500,000 on a plane or chopper, and then feed it gas sieved through a 30 micron diesel filter instead of a 0.5 micron av filter because a single av filter's $500 and the diesel filters were $150 for a pack of five from Dyke's Diesel Engine Warehouse. Get so many cow cockies ringing up asking for a bunch of aviation gear...but who also just so happened to buy a bunch of diesel filters along with it.
See the same thing all the time on Excavators. Driver thinks its the fitters job, fitter thinks its the drivers job. Then when its so bad it needs plating welding and boring, its my job.
@@simonsackett Ol Ball Stealthy prolly sloughed off and slewed askew...! nnnNNO Prob-lemmo! Cpl a jeezly guy wires and a good safety officer later......
Nah they’re in enginerding classes everywhere. They’re the shitheads that don’t pay attention in Solid Mechanics and steal McLovin’s assignment answers.
Correct. I've been spying on them and they're all watching some guy flying over a river with rockets strapped to his forearms, discussing fuel consumption and core strength issues. No mention of slew rings and moment loads.
I'm a retired mech. Eng. / project manager. If anything gave me anxiety, it was moving heavy objects at great heights. I always tried to avoid it, but sometimes it was unavoidable. Fortunately I was never forced to hire the cheapest contractor. I always chose a co. staffed by the old, grumpy, pedantic guys over the young gung-ho types. Yes they were more expensive, but no one got hurt on my watch.
I had a project manager that thought he could fire all the greybeards to hire younger cheaper welders. He lost the company 1.5 million in 3 months. When you're playing with exotic materials it is always cheaper to pay the Skilled hands their wages then it is to replace or cut out the youngs mistakes.
@@Slouworker Just keep trying. I had to take a job as a material handler. 6 months later I was Fitting Pipe 6 months later I was welding. 5 years after that I started the inspection side. It took me working every day harder than any other hand. I practiced on lunch break every day. Had people put me down for trying to overachieve or being a company man however those same greybeards were watching and they will give you shit and put you down because if you really want it no one is stopping you. After they feel like you're worth a damn they start teaching you instead of watching you struggle. It sucks but nothing in life is free and their knowledge came with a lot of blood and sweat, they will make you earn your spot.
In race engines we don't torque bolts, we stretch them a set amount regardless of torque. Everything affects torque, ie lube, etc, so it's more reliable stretching them.
MY question for this is why doesn't the load applied stretch the bolt the same length regardless of preload? Like if you only hand tighten the nut, you have zero preload. Thus the bolt will have 50000 pounds of force stretching it once the load is applied. If you torque the nut down, then you will have say 30000 pounds of preload stretching, PLUS the 50000 pounds of load stretching. Why would the bolt not stretch more in the second scenario?
@@temporarytelecast #2 would stretch more, with 80k force at install. #1 would be longer at the end of the test. As the previous comment stated the momentum built up by physically taking up the slack caused by no preload is likely going to exceed the 80,000 PSI of the torqued Bolt. In this scenario 30 preload 50 load would require a larger Bolt to accommodate the preload taking up three-fifths of the capacity.
I wonder what the fines are for this in Canada? If this shit happened in the states your PM logs better be godlike accurate or you're sued into oblivion and gonna be needing a new company. Hell, the Gas companies I build Compressor stations for we can't even have cranes on-site without certifications within 6 months even though they are certified yearly.
I was the only witness to a crane collapse back in 1990 that happened in Covington Georgia while at the local hospital where my very young daughter was having surgery. I stepped outside for a moment and it was storming with high winds with gusts up to 60+mph. New construction was happening and a pedestrian crosswalk/bridge was being built to accommodate the flow of people from the parking lot to the main entrance and by the way, it's the weekend with no construction workers on site. I was inside my vehicle watching the crane which was over 100 feet tall (small hospital) swaying in the wind and was thinking about if it were to fall, could it possibly be tall enough to hit my car and squish me where I sit and I thought hell yes it can! So I move my vehicle to space far enough away for safety and as soon as the vehicle is in park, I hear this boom snap at the same time, it sounded like a overly tight luggnut finally breaking loose with a breaker bar. It began to spin wildly and wobble and the rest is history, one big mangled up mess on top of the hospital and on the ground. It came no where close to where I was originally parked so I was good but it did keep me from crapping my drawers and from wear and tear on my ticker. My daughter is fine today with 4 of her own.... Yep it's a good day.
I'm from Loganville and seem to remember hearing about that collapse at Newton General. I literally just got home from Covington for a wedding about an hour ago. Small world.
You are one of the sharpest I have ever heard in this field. Another thing to watch out for is a crane system being subjected to unanticipated impact load, either in the structural system or wire rope management system. Once an unanticipated impact load is encountered, all deals are off. Take the crane immediately out of service and disassemble as a damaged structure with all worst-case safety measures in place. Every part of the system must be X-rayed, Magna-fluxed, and all fasteners replaced and wire rope replaced before return to service.
I used to work for a construction company and dealt a lot with cranes and crane compliance. Our rigging and wire rope supplier had a vendor fair where all the manufacturers came in and showed off their fancy new products. As i was looking through all the booths, i noticed the the wire rope manufacturers seemed to be unanimously German (there might have been one Austrian company, but its all the same to me.) I brought it up with one of the guys there and he was like "yeah. the Germans take wire rope and engineering pretty seriously." as it turns out, not only can students at German universities major in wire rope, but they can get a PHD in wire rope. I thought that was pretty fascinating.
A buddy of mine who builds slings tells me that for years lots of the Chinese wire is below spec or deliberately mislabled. He's rejected spools and they magically reappear.
Let's do a quick bench inventory: ✔️ Raspberry Pi ✔️ scraper blades ✔️ clapped out bike brake pads ✔️ hudrolick fittings ✔️ solenoid valve(s) ✔️cordless stapler ✔️ dial calipers ✔️drill bit index ✔️ big fucking bearing ✔️ black light? This right here, lads, is a man with a lotta irons in the fire.
I worked in a factory that built manlifts. The boom lifts used what they called ring gears between the turret and chassis. It took 2 of us to install that gear on the turret side. It had something like 40 1" diameter bolts. We had a 6' tall torque wrench, 1 guy held the head and moved it around the bolts in a star pattern. The other guy applied the torqe to the end of the handle. We torqued them in three stages ending at about 500 ft/lbs. And they were lock tight apllied. The ring to the chassis bolts were torque the same way except with one guy and a hydraulic torque unit.
Hey mate, I worked on a fleet of logging machines (Wagner log stackers) Qty. 32 wheel studs each wheel, 7/8" dia. studs, 460 ft lb torque. Almost a daily exercise. Yours and mine is only small stuff when you look into other industries. To Ave; Thank you for improving my knowledge with an entertaining, light, easy and succinct lesson.
Had a crane failure as well here in Winnipeg as well within the last year. While the operator was lifting a wall panel the crane suddenly let go. He heard the scream of the cable whipping by while his load was in free fall so he quickly disengaged and engaged the break and the load stopped. Picked the back of the crane off the ground and slammed it back down with an ear splitting crash but thankfully no one was hurt. If the load had come all the way down its very likely there would have been fatalities.
@@atom_gray As far as i know management called the cause of incident "operator error" and didn't elaborate further. If i ever run into that crane operator I'm going to ask him if the tire marks have healed yet.
Hello from Perth, Western Australia 😃😇 Who would of thought you knew ANYTHING about Australia, let alone our little town! Your knowledge divershity never ceases to amaze me!
It's always under load, front or back, lifting or nothing on that side, the counterweight then puts a load in the opposite direction. So the weight is shifting back n forth constantly.
Yup, true me and a colleague of mine were drawing a block diagram on a white board (in our brand new meeting room, in our brand new office)which resembled a dong and he decided to add details, little did we know, that someone put permanent markers next to the board :) we tried to clean it with alcohol, but it still was visible :) someone repainted the board couple of days after :)
@@ALovelyBunchOfDragonballz "The shaming of the Screw"? "Two Gentle-MEEEEN of Victoria, BC"? "The Machinist of Vancouver"? (OK, I'm running out of ideas now...)
I'd also be looking at bolt stretch as well. Nothing like slapping pre-load on those bolts over many many years and eventually you've stretched the bolt past its limit. I saw a boom crane drown itself in the Gulf of Mexico for this very reason.
Ben, In extreme applications we have bolts you can only torque once in their lifetime. If you torque them up and for some dumb luck you screwed up and have to remove them then they get tossed. Others we stamp or mark every time they are torqued. Two or three sequences and they get the boot. They get knicked or cut with s grinder so some lazy SOB won't take a short cut and dig one out of the bin.
@@christopherress6635 I doubt it given they are likely not removed to disassemble/move the crane. The manual would have said to set torque on each install but instead it says annually after an initial break-in period.
By far, my favourite most intuitive video on the channel that I've seen so far. I'm an ironworker that works in Toronto so that's why I found this so captivating
Like freshly distilled water that clear was your rubber band demonstration. Actually I "knew" that fatigue thing before, but now I know & have the power to commutate it, too. Thank you, Sifu!
Shear luck? Oh my, the puns are delightful this morning! And I still have my Broderick Wire Rope Company Yellow and Green Field Guide for Riggers that I got back in the 70's as a virgin apprentice. Dog eared, coffee stained and smeared with the tears of a dozen foremen.
Just stumbled across your channel, very witty and knowledgeable on a topic I never imagined I would spend 20 mins listening intently about. Keep up the good work 👍
I love the fact that there is someone out there just like me, intelligent enough to over think your original train of thought, get lost in it, and come right around back into the original thought without skipping a beat like nothing ever happened and everyone else around you is scratching their heads.
That digressive style of thought, if tethered to a loose leash of some intellectual discipline, can allow for one to consider what-ifs and unusual perspectives that can be creative in both design and problem-solving.
I wonder if part of the problem is the relatively new presence of luffing tower cranes in Canada. If memory serves, the first one was the parliament hill west block rehabilitation, and they've been seeing increased use since. Many mechanics still wouldn't be used to the differences, and we could be starting to see the results of their mistakes.
Never in a thousand years did I think I'd ever hear a shout out to my lil' old sleepy city of Perth! Another great video! Glad no one got hurt in this one
"Meh....a little torquey here, a little torquey there, oops forgot about chew little bolty but dont chew worry, a little moment load will get chew stiff in a hurry".
So much of this, at first glance, really demonstrates that the complacency created by the nanny safety state isn't really helping all that much at this point. New problems that never should happen
Shitty workers are almost always due to the company doing everything to piss away anyone who cares They offer atrocious working conditions and then are shocked anyone who knows what they are doing isn't sticking around
The mark of a genius like James Burke is I come to learn about French Cranes falling over in Canada and end up learning about underwater Volcanos by an German guy in Australia. Its not what I thought I was going to happen but here we are.
Another awesome video! Received your Kanuckistan tee shirts yesterday- the wife looked at them and said “ is that from the guy that swears a lot?” Ahhhh yes!
I work in manufacturing quality but I've got a background in art and it genuinely has come in handy with helping diagram things out for folks I work with
There are multitudinous reasons that these videos are so enjoyable.... for me, the primary reason is the tickling of new synapses forming neural pathways that lets me know I am learning something, followed by the re-enforcing of older pathways which brings the satisfaction of confirmation of knowledge. Add to this mix the childlike thrill of swears mixed with legit knowledge, making it feel naughty, which of course is more desirable. I posit that information learned in this format is more memorable than any college course or possibly even hands-on training, due to the multiple pleasure centers that are attached to the facts when presented in your particular style. Thank you.
At the first crane incident the operator saved a lot of people that were working under the crane . I was working at a job site several days after it happened and heard 2 inspectors talking about it. Apparently the operator noticed something wasn't going rite and rotated the crane so it would land on the roof of the building next to the job site instead of it collapsing to ground. His quick response saved many people who were working on site, and created some work for roofers and glazer's, I don't know what caused the failure but know he's a hero
Thanks 4 splainin' the metal fatigue dance. I'd had no idea why it is important to torque bolts to specific tightness. The preload prevents excess wiggle, which can wear out a tiny area, opening a notch for rust and disasters.
6:42 they're not essentially in fatigue, they're "essantially" in fatigue, much like the proofreader of that manual. Makes you wonder how many people actually read the manual instead of just doing what they're used to/what makes sense to them.
I swear when I was working a factory gig operating production equipment I was the only person in the facility that had ever read any of the manuals. Which was really sad, I basically worked 5 minutes out of a hour other then that I was just sitting between machines supervising in case something went wrong so no real reason to not read and them.
Jason W just forget the gardener/dvp and the robbers on the 407 and take the subway into the city. Crowded at rush hour sure but you’ll save yourself going bald after one or two trips on the freeways.
Bro, honestly, this makes so much sense now. This video and comments was truly a gold nugget of information. Thank goodness nobody got hurt from careless maintaining practices.
It’s amazing how often these inspections are pen whipped or not even done. It’s a lot of work to preload using torque multiplier, sequence, ect..usually done unsupervised by a apprentice that doesn’t understand the importance, or flat Ass doesn’t care.
Doesn't surprise me, I'm pretty sure it's human nature to half-ass any work they can (or think they can) get away with. Trouble is we apparently let them get away with it.
@@Broken_Yugo big part is education, they know how to tighten the bolt but dont know the why so its a "waste of time". Plenty of cars is scrap yards years before they should have been for the same reason, dont understand the "why" for the maintenance and dont think it matters much, it doesnt fall apart the first time and the effects aren't visually apparent so it it must not matter.
@@jaydunbar7538 Eh, at least with cars I find it goes the other way. Like NEVER buy a car from a mechanic unless they're some sort of enthusiast or something, they don't fix or maintain anything if they think they can get away with it (I.E. scrap or sell before catastrophe). There's a sweet spot of people that know enough to do the work right but not enough to cheat, but that's rare outside enthusiast stuff.
@@Broken_Yugo Most mechanics still fit exactly what I said, they know the "how" not the "why". I've had my pickup fixed 4 times by licensed mechanics that knew the how, but didn't know the why so I ended up with the same exact problem again since they fixed what was obviously broke and not what was causing it. Bending push rods and breaking rocker arms, 20 grand into repeated repairs and it turns out it was valve springs getting weak, $130 for a new set from comp cam and problem solved. They can take it apart and put it together, same as most people know they need to change the oil. The average mechanic knows how to replace parts, that doesnt make them enginers. The enthusiasts you speak of understand the why because people tend to learn and retain information about things they are passionate about, or they trust the enginers that designed it and follow the maintenance religiously for the same reasons. Either way its a matter of education, whether its personal education or trust in the education of the enginer that designed the maintenance schedule.
One of my construction instructors back in trade schools said one thing time and time again; "Complacency is THE killer in the workplace. And everywhere else to." A personal creed of mine since.
I learned a lotta shit that I shoulda already known. That's one of the reasons why I watch this channel - the primary reason is because I learn a lot of vulgar references to otherwise non-vulgar things - also shit I shoulda already known, but I'm from the Southeastern US and some Canadians tend to phrase things differently than us. Great video!
Picture of post accident checks out.. all the "top men" who've never been on the site or picked up a tool in 10+ years all standing around looking at each other. Check.
i worked at darlington hydro as a mechanic, we had 12 plus cranes on site strict maintenance routine. only three groups were allowed near cranes mechanics, electricians, crane operators, then all cranes had double ball bearings on slewing, not sure when they went to taper roller bearings any ideas when the change was made,worked the uk scene and offshore but still learning
You know you’re getting older when static/dynamic forces causing metal fatigue are entertaining at 6am. I have a computer engineering degree, but I recall that 35 yrs ago Statics & Dynamics was one of the best classes. The prof gave interesting examples from his years in the field.
Since you went off into the land of metal fatigue and wire ropes, do you have any comment on the suspension cable failure on the Arecibo Observatory radio telescope?
This was a good one, really liked it. The explanation of beach marks and the shear lip was fantastic. I had a cap screw come apart on me while tightening the vice jaws on the kurt a couple months ago, felt like nothing, textbook example.
Shouldn't the preload match the expected loading so there is no elastic cycling? More realistic is preload to (in your example) 50kpsi and load ( working against preload) to
I tried saying the same thing but you said it better. But I also got to thinking about the operator unloading the hook. If done suddenly, it seems like that would increase the load that the farsteners see.
That used to be the simple rule of thumb, but as AVE points out, everything is a spring, and that rule of thumb ignores the fact that the compressed members are also springs. During pre-loading (no external load) the bolts stretch and the joint squashes, both act as springs in series, and the force in the bolt spring is equal to the force in the joint member spring(s). Since the joint members are (usually) much stiffer springs than the bolt is, they only squash a small amount compared to the amount the bolt stretches under pre-loading. Key thing though is that after preloading, they are still both springs. What that means is that as external tensile load is applied to the joint, it is going into that spring system. So some of that load is reacted by reducing compression in the joint members, but some also goes into stretching the bolt. The relative amount of load taken by the compressed joint members relaxing vs the bolt stretching is determined by the ratio of stiffness of the 2 springs. A well designed structural bolt joint tries to make the bolt as unstiff (floppy??) as possible, and the compressed members as stiff as possible so that nearly all external load is taken by relieving joint compression so that the bolt sees a negligible amount of stretch/increased load, although it will always see some. This is done to prevent the vulnerable bolts from seeing fatigue cycles. Unfortunately, the design codes for bolting tend to be poorly written, opaque and hard to follow, so quite a lot of people working in engineering actually don't know how to design structural bolted joints appropriately. I see quite a lot of poorly designed joints holding up pretty big critical things (including cranes) and a lack of understanding of the implications.
Dan L. No, more like 3 or four. And it’s maddening that I can’t find video of a surviving example in operation. But at least with the further information in the video I did find, I understand the reasons why this man engine existed. I would have thought the belt man lift or other options would have been a better option. But the man engine was like a “life hack” for already existing shaft driven water pumps.
Also, you can do rolled 3A and 3B threads. We do it in critical aerospace parts because it is superior to cut thread by a fair margin since it forms the grain direction to the thread form rather than cutting through the grains. However the rollers are more expensive and they dont last very long on tougher metals.
![ถ้าพี่วุ้นท้อง แป้งจะท้องไปด้วยกัน !!!! [ดูคลิปเต็มหน้าช่อง] #Short | PANG ORNHIRA](http://i.ytimg.com/vi/FeyEnVMwitA/mqdefault.jpg)
Went to service a 2 year old wharf side loading crane found the untouched grease gun supplied with it still in the packaging, no grease on the slew ring rocking like grandpas old porch chair £30,000 later a new slew ring installed for the lack of £20 worth of grease.
Yeah but that grease gun is still frickin minty as Frick ,you could get good money for something like that ,
It's rarely the $100,000 bits that fuck up on their own. It's the $10 bits no one could be arsed caring about.
See: the amount of pilots on stations and out in the bush that will spend $500,000 on a plane or chopper, and then feed it gas sieved through a 30 micron diesel filter instead of a 0.5 micron av filter because a single av filter's $500 and the diesel filters were $150 for a pack of five from Dyke's Diesel Engine Warehouse.
Get so many cow cockies ringing up asking for a bunch of aviation gear...but who also just so happened to buy a bunch of diesel filters along with it.
See the same thing all the time on Excavators. Driver thinks its the fitters job, fitter thinks its the drivers job. Then when its so bad it needs plating welding and boring, its my job.
@ball stealthy Plenty of grease on the slew ring, I hope.
@@simonsackett
Ol Ball Stealthy prolly sloughed off and slewed askew...!
nnnNNO Prob-lemmo! Cpl a jeezly guy wires and a good safety officer later......
Psshh, let’s be honest... the cool kids were never here to begin with.
Nah they’re in enginerding classes everywhere. They’re the shitheads that don’t pay attention in Solid Mechanics and steal McLovin’s assignment answers.
Correct. I've been spying on them and they're all watching some guy flying over a river with rockets strapped to his forearms, discussing fuel consumption and core strength issues. No mention of slew rings and moment loads.
uh,,, we ARE the cool kids.
@@TheButtDr Well I know I am!
All the cool kiddos stick it to the end.
I'm a retired mech. Eng. / project manager. If anything gave me anxiety, it was moving heavy objects at great heights.
I always tried to avoid it, but sometimes it was unavoidable.
Fortunately I was never forced to hire the cheapest contractor.
I always chose a co. staffed by the old, grumpy, pedantic guys over the young gung-ho types. Yes they were more expensive, but no one got hurt on my watch.
The old grey beards know more than god, young un's learn the hard way
If you do not like heavy loads moved at height stay far away from wind energy..... we stack out loads that would make you pucker
I had a project manager that thought he could fire all the greybeards to hire younger cheaper welders. He lost the company 1.5 million in 3 months. When you're playing with exotic materials it is always cheaper to pay the Skilled hands their wages then it is to replace or cut out the youngs mistakes.
No one will notice you or your careful decisions unless you do something horribly wrong and get on the news, so as a random civilian I thank you.
@@Slouworker Just keep trying. I had to take a job as a material handler. 6 months later I was Fitting Pipe 6 months later I was welding. 5 years after that I started the inspection side. It took me working every day harder than any other hand. I practiced on lunch break every day. Had people put me down for trying to overachieve or being a company man however those same greybeards were watching and they will give you shit and put you down because if you really want it no one is stopping you. After they feel like you're worth a damn they start teaching you instead of watching you struggle. It sucks but nothing in life is free and their knowledge came with a lot of blood and sweat, they will make you earn your spot.
Hanlon's Razor: Never attribute to malice that which is adequately explained by stupidity.
I use this one daily at work.
Even the manual says to torque in a satanic ritual, no wonder the jezlus thing fell down.
Wow! I said the same.
Bruh, that's a pentagram with an extra chromosome. Double whammy with the Satanism and the mental deficiency.
0y vэy!
And make sure that the surfaces are clean before mating the surfaces.
Jesless..
That preload visual with the rubber band was perfect. I gained a brain wrinkle on that one. Thank you for that, AvE.
My thoughts exactly, keep up the good work AvE
In race engines we don't torque bolts, we stretch them a set amount regardless of torque. Everything affects torque, ie lube, etc, so it's more reliable stretching them.
MY question for this is why doesn't the load applied stretch the bolt the same length regardless of preload? Like if you only hand tighten the nut, you have zero preload. Thus the bolt will have 50000 pounds of force stretching it once the load is applied. If you torque the nut down, then you will have say 30000 pounds of preload stretching, PLUS the 50000 pounds of load stretching. Why would the bolt not stretch more in the second scenario?
@@temporarytelecast I believe the 50000 lb load has to overcome the 30000 lbs of preload, so it only adds 20000 lbs beyond the preloaded stretch.
@@temporarytelecast #2 would stretch more, with 80k force at install. #1 would be longer at the end of the test. As the previous comment stated the momentum built up by physically taking up the slack caused by no preload is likely going to exceed the 80,000 PSI of the torqued Bolt.
In this scenario 30 preload 50 load would require a larger Bolt to accommodate the preload taking up three-fifths of the capacity.
The moment load, is inversely proportional to the angle of the dangle squared by the sag of the bag.
best comment here!
dont forget to take in to account shaft yaw
@@tbled52 Hey, keep your jaw from that shaft!
😂
After all is said and done Geometry isn't that hard in the end.
"Hey, Mark. These bolts are stretched out and should be replaced."
"You know what that will cost me?!"
I wonder what the fines are for this in Canada? If this shit happened in the states your PM logs better be godlike accurate or you're sued into oblivion and gonna be needing a new company. Hell, the Gas companies I build Compressor stations for we can't even have cranes on-site without certifications within 6 months even though they are certified yearly.
@@Chris-dg6km Fines? PFF when this happens the companies just bribe the government and magically the whole problem goes away.
Can’t help but to recall an old Stooges bit:
“I want this in competent hands”
“Soit-enly, we’re all incompetent”
One that stuck with me was
Man walks in: "gentlemen"
Stooges, looking around: "...where?"
(reading contract)
"What's this?"
"That's the sanity clause."
"Oh, no... you canna fool me, there is a no Sanity Claus."
fucking timeless comedy. The stooges still holds up to this day.
quote Remind me to kill you later, why i oughter, ah wise guy hey, nuk nuk nuk
@Mike 'DeGrasse' Tyson Its on his garage underground stuff.
Fascinating, loved the meandering nerdgasm regarding metal fatigue and wire rope.
Those assholz
@@kevinH7510
Ejaculation while destructively testing samples of their own work is part of a welder's training.
Or is that just me?
@@wrongtown I love the Peth->WA->Mining in the Harz Mountains mnemonic chain :-)
I was the only witness to a crane collapse back in 1990 that happened in Covington Georgia while at the local hospital where my very young daughter was having surgery. I stepped outside for a moment and it was storming with high winds with gusts up to 60+mph. New construction was happening and a pedestrian crosswalk/bridge was being built to accommodate the flow of people from the parking lot to the main entrance and by the way, it's the weekend with no construction workers on site. I was inside my vehicle watching the crane which was over 100 feet tall (small hospital) swaying in the wind and was thinking about if it were to fall, could it possibly be tall enough to hit my car and squish me where I sit and I thought hell yes it can! So I move my vehicle to space far enough away for safety and as soon as the vehicle is in park, I hear this boom snap at the same time, it sounded like a overly tight luggnut finally breaking loose with a breaker bar. It began to spin wildly and wobble and the rest is history, one big mangled up mess on top of the hospital and on the ground. It came no where close to where I was originally parked so I was good but it did keep me from crapping my drawers and from wear and tear on my ticker. My daughter is fine today with 4 of her own.... Yep it's a good day.
I'm from Loganville and seem to remember hearing about that collapse at Newton General.
I literally just got home from Covington for a wedding about an hour ago.
Small world.
4 .... kids or cranes?
@@JohnSmith-jq9xx LOL!
man glad people like you are in the local. Ive been in covington a lot lately.
You are one of the sharpest I have ever heard in this field. Another thing to watch out for is a crane system being subjected to unanticipated impact load, either in the structural system or wire rope management system. Once an unanticipated impact load is encountered, all deals are off. Take the crane immediately out of service and disassemble as a damaged structure with all worst-case safety measures in place. Every part of the system must be X-rayed, Magna-fluxed, and all fasteners replaced and wire rope replaced before return to service.
so sharp he thinks a TOWER CRANE has a LUFFING JIB
I used to work for a construction company and dealt a lot with cranes and crane compliance. Our rigging and wire rope supplier had a vendor fair where all the manufacturers came in and showed off their fancy new products. As i was looking through all the booths, i noticed the the wire rope manufacturers seemed to be unanimously German (there might have been one Austrian company, but its all the same to me.) I brought it up with one of the guys there and he was like "yeah. the Germans take wire rope and engineering pretty seriously." as it turns out, not only can students at German universities major in wire rope, but they can get a PHD in wire rope. I thought that was pretty fascinating.
How long can you use a bolt in a crane like that? Is there a service interval?
@@CyberlightFG Check your crane service manual
Germany - the only country where you can choose between getting a PhD in Wire Rope or a PhD in Brewing Beer. What a country!
A buddy of mine who builds slings tells me that for years lots of the Chinese wire is below spec or deliberately mislabled. He's rejected spools and they magically reappear.
You can get a PhD in anything where there's original research to be done
Let's do a quick bench inventory:
✔️ Raspberry Pi
✔️ scraper blades
✔️ clapped out bike brake pads
✔️ hudrolick fittings
✔️ solenoid valve(s)
✔️cordless stapler
✔️ dial calipers
✔️drill bit index
✔️ big fucking bearing
✔️ black light?
This right here, lads, is a man with a lotta irons in the fire.
selfdriving vehicle that scrapes ice off the road? winter prep!
Well, you need the black light after having your way with the big bearing. Hopefully the dial calipers got that day off.
I for 1 would like to point out the obligatory pack of Marlboro!
Powder actuated Lead injection magazine springs.
sounds like a thursday to me...
Things you hear only here:
"Remember, everything is a spring. Frame, you fak! Remember, everything is a spring."
framing and focusing is also a spring! :D it never stays still
I worked in a factory that built manlifts. The boom lifts used what they called ring gears between the turret and chassis. It took 2 of us to install that gear on the turret side. It had something like 40 1" diameter bolts. We had a 6' tall torque wrench, 1 guy held the head and moved it around the bolts in a star pattern. The other guy applied the torqe to the end of the handle. We torqued them in three stages ending at about 500 ft/lbs. And they were lock tight apllied. The ring to the chassis bolts were torque the same way except with one guy and a hydraulic torque unit.
Hey mate, I worked on a fleet of logging machines (Wagner log stackers) Qty. 32 wheel studs each wheel, 7/8" dia. studs, 460 ft lb torque. Almost a daily exercise. Yours and mine is only small stuff when you look into other industries.
To Ave; Thank you for improving my knowledge with an entertaining, light, easy and succinct lesson.
AvE that black and white drawing of the swings perfectly represents what I do and deal every day.
You build swings.
Butadiene pendulum engineer is a prestigious gig.
I still don't see what is wrong with the third swing. It's secured to the strongest part of the tree, like it should be.
@@evictioncarpentry2628 priceless.
As a mechanical and electrical repairs worker I get that in words like the thingy is broken or the whatsit don't work.
Had a crane failure as well here in Winnipeg as well within the last year. While the operator was lifting a wall panel the crane suddenly let go. He heard the scream of the cable whipping by while his load was in free fall so he quickly disengaged and engaged the break and the load stopped. Picked the back of the crane off the ground and slammed it back down with an ear splitting crash but thankfully no one was hurt. If the load had come all the way down its very likely there would have been fatalities.
Not everyone can tell their coworkers "Remember when y'all almost got killed if it weren't for me?"
@@fredwupkensoppel8949 i hear it all too often from management...
@@atom_gray As far as i know management called the cause of incident "operator error" and didn't elaborate further. If i ever run into that crane operator I'm going to ask him if the tire marks have healed yet.
@@stickjohnny Too true...
Im always looking, no time for daydreaming.
AvE: Puts massive roller bearing on workbench.
Me: Weird flex, but OK.
Underrated ☝
Nothing wrong with using an oversized prop, easier to video.
Hello from Perth, Western Australia 😃😇 Who would of thought you knew ANYTHING about Australia, let alone our little town! Your knowledge divershity never ceases to amaze me!
The only problem with your crane drawing is it actually wasn't under load anymore, it released it's load.
Ok, I was thinking you were literal here until I remembered the drawing.😂
It's always under load, front or back, lifting or nothing on that side, the counterweight then puts a load in the opposite direction. So the weight is shifting back n forth constantly.
Release the schmoo!
Well, I'm not the only one that took your post literally, but I eventually got the joke.
in a moment
Knew I’d enjoy the tool reviews when I got here. Did not know how much I’d appreciate these honest assessments and what not. Good on ya.
Lesson learned: nobody is too old or too professional to giggle at drawing dongs.
Yup, true me and a colleague of mine were drawing a block diagram on a white board (in our brand new meeting room, in our brand new office)which resembled a dong and he decided to add details, little did we know, that someone put permanent markers next to the board :) we tried to clean it with alcohol, but it still was visible :) someone repainted the board couple of days after :)
Skeet skeet
It's like an old Top Gear episode.
God, you manage to slip in "Choctaw Bingo" into a crane failure. lol Great job as always.
AvE: **gets rid of the 'cool kids'**
AvE: Now that it's just us *NERDS* here, you gon learn today.
I fall for gravity jokes
too
@@discord2000 was it light reading?
It gave me a heavy heart
There is no gravity.
The earth sucks.
Come for the tool reviews but stay for the engineering seminars and the valuable management advice. Thank you, Papa.
7:08 unexpected diceman poetry
LOL that made me laugh!
This is like watching Shakespeare every time.. i dont understand half of it but love it
Bumblespeare
I stay past the 5-minute mark just for the innovative swearing and malapropisms.
I’m just like you, in fact, I feel smarter afterwards. Then I have something to talk about with the boys 😂
Shakespeare isn't hard, but there's a lot of dick jokes.
@@ALovelyBunchOfDragonballz "The shaming of the Screw"? "Two Gentle-MEEEEN of Victoria, BC"? "The Machinist of Vancouver"?
(OK, I'm running out of ideas now...)
I'd also be looking at bolt stretch as well. Nothing like slapping pre-load on those bolts over many many years and eventually you've stretched the bolt past its limit. I saw a boom crane drown itself in the Gulf of Mexico for this very reason.
They are supposed to be replaced.
Ben, In extreme applications we have bolts you can only torque once in their lifetime. If you torque them up and for some dumb luck you screwed up and have to remove them then they get tossed. Others we stamp or mark every time they are torqued. Two or three sequences and they get the boot. They get knicked or cut with s grinder so some lazy SOB won't take a short cut and dig one out of the bin.
Curious if they are mandated single use or not...
@@christopherress6635 I doubt it given they are likely not removed to disassemble/move the crane. The manual would have said to set torque on each install but instead it says annually after an initial break-in period.
Regular fastener replacement must be part of the maintenance procedures on any crane system.
That pause and giggle after "very carefully and gently with a rubber" pretty much is a perfect summation of why I love your videos so much.
By far, my favourite most intuitive video on the channel that I've seen so far. I'm an ironworker that works in Toronto so that's why I found this so captivating
I appreciate any reference to the north texas southern oklahoma crystal methamphetamine industry
That's a South Mexico cartels operations guided by the democrats
I think you did it fine yourself.. CHEERS TO the north texas southern oklahoma crystal methamphetamine industry !!
Yeah, they make the good shit.
The bourbon stain line at 3:35 references some other Oklahoma boys: turnpike troubadours
Give em a little bit of benadryl and some cherry coke. Uncle Slayton is waiting! And I want some sister twisters! Haha
Love these edumacational nerdgasm lecture vids. It's like khan academy for rough necks.
Con academy
Plus he gets to draw a penis, just because... reasons.
Thanks for the mention!!! Born and raised in Perth, Western Australia. Love the channel mate!
You would be suprised
ooops
Like freshly distilled water that clear was your rubber band demonstration.
Actually I "knew" that fatigue thing before, but now I know & have the power to commutate it, too. Thank you, Sifu!
Shear luck? Oh my, the puns are delightful this morning!
And I still have my Broderick Wire Rope Company Yellow and Green Field Guide for Riggers that I got back in the 70's as a virgin apprentice. Dog eared, coffee stained and smeared with the tears of a dozen foremen.
That book sure oozes magical nerd powaaah. :)
And greetings from Perth Western Australia gents. AVE if you are ever over this way, look me up. I owe you a few dozen beers.
Just stumbled across your channel, very witty and knowledgeable on a topic I never imagined I would spend 20 mins listening intently about. Keep up the good work 👍
This is one of those videos where your depth of knowledge inspires a lot of learning . I really really enjoyed this!
I love the fact that there is someone out there just like me, intelligent enough to over think your original train of thought, get lost in it, and come right around back into the original thought without skipping a beat like nothing ever happened and everyone else around you is scratching their heads.
That digressive style of thought, if tethered to a loose leash of some intellectual discipline, can allow for one to consider what-ifs and unusual perspectives that can be creative in both design and problem-solving.
5:26 "tough on those farsteners. They gotta be tough, and they've gotta be snugged up." .... and they gotta BE THERE.
Seattle crane collapse.
I need a fastener!
they gotta be there. :-) this cracked me up.
my wife and I are much happier after this lesson TY so much Love Doctor!!
One of the best channels on TH-cam. Thanks for the laughs and the lesson :)
I wonder if part of the problem is the relatively new presence of luffing tower cranes in Canada. If memory serves, the first one was the parliament hill west block rehabilitation, and they've been seeing increased use since. Many mechanics still wouldn't be used to the differences, and we could be starting to see the results of their mistakes.
Good on whoever called out the lack of bolts on the crane. Its very risky to call out safety hazards on jobsites. Maybe more now than ever
Never in a thousand years did I think I'd ever hear a shout out to my lil' old sleepy city of Perth! Another great video! Glad no one got hurt in this one
I have heard a lot of explanations on why to preload or pre stretch bolts, none of them made a lick of sense until this. Thank you.
Here in Toronto land there are rumors of company wars and that these two "accidents" weren't accidents
Yeah doesn't the mafia control canadian construction companies?
"Meh....a little torquey here, a little torquey there, oops forgot about chew little bolty but dont chew worry, a little moment load will get chew stiff in a hurry".
So much of this, at first glance, really demonstrates that the complacency created by the nanny safety state isn't really helping all that much at this point.
New problems that never should happen
More rules is a poor substitute for accountability.
Don't blame regs for shitty workers
Too many rules gets so much in the way of doing the actual work that it becomes a box ticking exercise to pretend the checks were done.
@@DogRedful Much agreed. Cheers from France, the country of many rules and little (if any) accountability.
Shitty workers are almost always due to the company doing everything to piss away anyone who cares
They offer atrocious working conditions and then are shocked anyone who knows what they are doing isn't sticking around
The mark of a genius like James Burke is I come to learn about French Cranes falling over in Canada and end up learning about underwater Volcanos by an German guy in Australia. Its not what I thought I was going to happen but here we are.
Another awesome video! Received your Kanuckistan tee shirts yesterday- the wife looked at them and said “ is that from the guy that swears a lot?” Ahhhh yes!
I like how you used the ''Octagonal'' Nut on the bottom for extra ''Holdification'' power in the drawing.
Art is important, one of the finest forms of communication. Saves on a whole ton of babble
I work in manufacturing quality but I've got a background in art and it genuinely has come in handy with helping diagram things out for folks I work with
Art is also found in @AvE's outtro. I always laugh when I hear it. I'm there. Vice is solid and cranking constantly. Send it.
I LOVE how excited you got over wire rope. I learned something today.
New words are so awesome! What a great education I get from your videos.
Hey Ave, could you do a failure analysis of the Arecibo failure from last week?
After watching these crane videos I will drive 5 miles out of my way to stay away from any crane.
Hardly ever happens.
Don't get anywhere close to mobile homes being moved, now that is seat of your pants ghetto rigged transportation.
It's kind of ironic that I ride a motorcycle every day. 1000000% more likely to kill me.
Professor Uncle bumble, such a brilliant mind. Thank you for your excellent explanation once again.
There are multitudinous reasons that these videos are so enjoyable.... for me, the primary reason is the tickling of new synapses forming neural pathways that lets me know I am learning something, followed by the re-enforcing of older pathways which brings the satisfaction of confirmation of knowledge. Add to this mix the childlike thrill of swears mixed with legit knowledge, making it feel naughty, which of course is more desirable. I posit that information learned in this format is more memorable than any college course or possibly even hands-on training, due to the multiple pleasure centers that are attached to the facts when presented in your particular style.
Thank you.
Please digress more, I love your chain of thought. This is the most interesting talk yet. Keep on:-)
Thumbs up for the Choctaw Bingo reference.
I liked the Perry Mason reference.
At the first crane incident the operator saved a lot of people that were working under the crane . I was working at a job site several days after it happened and heard 2 inspectors talking about it. Apparently the operator noticed something wasn't going rite and rotated the crane so it would land on the roof of the building next to the job site instead of it collapsing to ground. His quick response saved many people who were working on site, and created some work for roofers and glazer's, I don't know what caused the failure but know he's a hero
Thanks 4 splainin' the metal fatigue dance.
I'd had no idea why it is important to torque bolts to specific tightness. The preload prevents excess wiggle, which can wear out a tiny area, opening a notch for rust and disasters.
6:42 they're not essentially in fatigue, they're "essantially" in fatigue, much like the proofreader of that manual. Makes you wonder how many people actually read the manual instead of just doing what they're used to/what makes sense to them.
I swear when I was working a factory gig operating production equipment I was the only person in the facility that had ever read any of the manuals. Which was really sad, I basically worked 5 minutes out of a hour other then that I was just sitting between machines supervising in case something went wrong so no real reason to not read and them.
As a tourist I saw all of Canadia Toronto-Niagra! 😀 I did learn one thing it's pronounced Torondo....
When I was there, they pronounced Toronto as:
Traffic-jam
Toronto-montreal is just the Communist dross skim coming off of the libtard northeast US...
Jason W just forget the gardener/dvp and the robbers on the 407 and take the subway into the city. Crowded at rush hour sure but you’ll save yourself going bald after one or two trips on the freeways.
I live in barrie, north of Toronto. We pronounce it trono most of the time here.
It's actually Tronno
I learn so much watching your vids thank you so much
Bro, honestly, this makes so much sense now. This video and comments was truly a gold nugget of information. Thank goodness nobody got hurt from careless maintaining practices.
Wait i thought the entiry building was an apiary... you know, to accomodate us apes....
Bee serious, honey.
It’s amazing how often these inspections are pen whipped or not even done. It’s a lot of work to preload using torque multiplier, sequence, ect..usually done unsupervised by a apprentice that doesn’t understand the importance, or flat Ass doesn’t care.
Doesn't surprise me, I'm pretty sure it's human nature to half-ass any work they can (or think they can) get away with. Trouble is we apparently let them get away with it.
@@Broken_Yugo we never half ass anything unless quarter assing doesnt work.
@@Broken_Yugo big part is education, they know how to tighten the bolt but dont know the why so its a "waste of time". Plenty of cars is scrap yards years before they should have been for the same reason, dont understand the "why" for the maintenance and dont think it matters much, it doesnt fall apart the first time and the effects aren't visually apparent so it it must not matter.
@@jaydunbar7538 Eh, at least with cars I find it goes the other way. Like NEVER buy a car from a mechanic unless they're some sort of enthusiast or something, they don't fix or maintain anything if they think they can get away with it (I.E. scrap or sell before catastrophe). There's a sweet spot of people that know enough to do the work right but not enough to cheat, but that's rare outside enthusiast stuff.
@@Broken_Yugo Most mechanics still fit exactly what I said, they know the "how" not the "why". I've had my pickup fixed 4 times by licensed mechanics that knew the how, but didn't know the why so I ended up with the same exact problem again since they fixed what was obviously broke and not what was causing it. Bending push rods and breaking rocker arms, 20 grand into repeated repairs and it turns out it was valve springs getting weak, $130 for a new set from comp cam and problem solved. They can take it apart and put it together, same as most people know they need to change the oil. The average mechanic knows how to replace parts, that doesnt make them enginers. The enthusiasts you speak of understand the why because people tend to learn and retain information about things they are passionate about, or they trust the enginers that designed it and follow the maintenance religiously for the same reasons. Either way its a matter of education, whether its personal education or trust in the education of the enginer that designed the maintenance schedule.
Once again I have learned something and many things, new! Thanks!
One of my construction instructors back in trade schools said one thing time and time again; "Complacency is THE killer in the workplace. And everywhere else to."
A personal creed of mine since.
Love that tree swing enginerding evolution.
So what you're saying is that if I limit the length of my stroke, my bolt will last longer?
Tanks for break’ in down the nuts and bolts of failure sir.
I learned a lotta shit that I shoulda already known.
That's one of the reasons why I watch this channel - the primary reason is because I learn a lot of vulgar references to otherwise non-vulgar things - also shit I shoulda already known, but I'm from the Southeastern US and some Canadians tend to phrase things differently than us.
Great video!
"the front fell off”...
..."tow it out of the environment "
A little Andrew Dice Clay nursery rhyme on my Saturday goes a long way. Badda Bing.
Very helpful to have the spring diagram. Not that I ever considered torquing bolts irrelevant, but understanding the why helps solidify the importance
You are a master teacher. I have learned so much from you.
Unfortunate on the cranes.
Picture of post accident checks out.. all the "top men" who've never been on the site or picked up a tool in 10+ years all standing around looking at each other. Check.
They are the ones that stand out as they are mostly to wear a tie on site.
i worked at darlington hydro as a mechanic, we had 12 plus cranes on site strict maintenance routine. only three groups were allowed near cranes
mechanics, electricians, crane operators, then all cranes had double ball bearings on slewing, not sure when they went to taper roller bearings
any ideas when the change was made,worked the uk scene and offshore but still learning
Videos like this is why I'm subscribed and watch every one.
I enjoyed how 3/4 of the frame was filled with unrelated stuff.
I would LOVE to get the AvE assessment on the old Arecibo radio telescope cable failure.
Wonder if it got overloaded past elastic yield on one of the hurricanes or earthquake ?
Nothing made sense, until the last drawing and it hits me...ive seen this in every bolt I've snapped by over tightening it.
You know you’re getting older when static/dynamic forces causing metal fatigue are entertaining at 6am.
I have a computer engineering degree, but I recall that 35 yrs ago Statics & Dynamics was one of the best classes. The prof gave interesting examples from his years in the field.
AvE has to be the only Canadian able to quote Choctaw bingo,and Easton and Main let alone within a minute of eachother,this okie approves 🤘🏼
I think what we really need is Justin Trudeau to save us all by banning cranes! Enough is enough!
;)
No one should have cranes of war!
Shawn West 🤦🏻♂️. Sarcasm is requesting your location
Shawn West poor Shawn.......did your dad not play catch with you as a child? Just angry at everybody, aren’t ya!
Since you went off into the land of metal fatigue and wire ropes, do you have any comment on the suspension cable failure on the Arecibo Observatory radio telescope?
We JUST replaced those cables 27 years ago!
"roscoe tried to miss him, but he didn't quite" great song reference very appropriate
This was a good one, really liked it. The explanation of beach marks and the shear lip was fantastic.
I had a cap screw come apart on me while tightening the vice jaws on the kurt a couple months ago, felt like nothing, textbook example.
Shouldn't the preload match the expected loading so there is no elastic cycling? More realistic is preload to (in your example) 50kpsi and load ( working against preload) to
Enginerding theory is lazy (and I mean that in a good way) and real world outcomes are more dynamic than many engineers seem to remember.
I tried saying the same thing but you said it better.
But I also got to thinking about the operator unloading the hook. If done suddenly, it seems like that would increase the load that the farsteners see.
00:00
That used to be the simple rule of thumb, but as AVE points out, everything is a spring, and that rule of thumb ignores the fact that the compressed members are also springs. During pre-loading (no external load) the bolts stretch and the joint squashes, both act as springs in series, and the force in the bolt spring is equal to the force in the joint member spring(s). Since the joint members are (usually) much stiffer springs than the bolt is, they only squash a small amount compared to the amount the bolt stretches under pre-loading.
Key thing though is that after preloading, they are still both springs. What that means is that as external tensile load is applied to the joint, it is going into that spring system. So some of that load is reacted by reducing compression in the joint members, but some also goes into stretching the bolt. The relative amount of load taken by the compressed joint members relaxing vs the bolt stretching is determined by the ratio of stiffness of the 2 springs.
A well designed structural bolt joint tries to make the bolt as unstiff (floppy??) as possible, and the compressed members as stiff as possible so that nearly all external load is taken by relieving joint compression so that the bolt sees a negligible amount of stretch/increased load, although it will always see some. This is done to prevent the vulnerable bolts from seeing fatigue cycles.
Unfortunately, the design codes for bolting tend to be poorly written, opaque and hard to follow, so quite a lot of people working in engineering actually don't know how to design structural bolted joints appropriately.
I see quite a lot of poorly designed joints holding up pretty big critical things (including cranes) and a lack of understanding of the implications.
Preload stress is generally 60-80% of anticipated stress
Wtf, tell me more about that “man engine” lift system.
I too was curious...looks to be an early elevator? en.wikipedia.org/wiki/Man_engine
HA! The old jazz hands haven’t failed me: th-cam.com/video/smgJagniub4/w-d-xo.html
Water falls down, which lets people go up.lol
Did you replay that part 15 times like I did?
Dan L. No, more like 3 or four. And it’s maddening that I can’t find video of a surviving example in operation. But at least with the further information in the video I did find, I understand the reasons why this man engine existed. I would have thought the belt man lift or other options would have been a better option. But the man engine was like a “life hack” for already existing shaft driven water pumps.
WOW! You've made my brain happy. Thanks!
Also, you can do rolled 3A and 3B threads. We do it in critical aerospace parts because it is superior to cut thread by a fair margin since it forms the grain direction to the thread form rather than cutting through the grains. However the rollers are more expensive and they dont last very long on tougher metals.
That was a long way around the horn just to say, Maintenance foreman needs a new torque wrench.
He's talking about my home land.
I'm in Perth WA. Born and raised.
Same..
Greetings from the "Western Awwwstralia - lots of mining" area :)
No place better,
Me to
@Thomas Williams Hell yeh👍🇦🇺
I've been waiting for your 2 cents on this. Thanks.