Can Face Shield Stop Exploding 9'' Grinding Disc? Work Safety Experiment
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- Опубликовано: 2 окт 2024
- Can high end polycarbonate face shield stop exploding grinder disc in case of an accident where disc spins way too fast? We will try out on our concrete bunker. Don't try this at home and don't never remove your grinder guard!
Link to part 1 • Metal Cutting Disc Exp...
"You can clearly see that the helmet really does something"
-Tell it to the watermelon!
He, it dies with the comfortable feeling that no other watermelon was killed with that piece of shrapnel! xD
It does !!
It catches the disc fragment INSIDE your head !!
@@thetorchchannel357 Exactly what I want to happen in this kind of situation!
Yep it really failed.
The helmet, it does nothing!
If Kevin McCalister had access to his dad's power tools, Home Alone would be over in 2 minutes (and look more like Saw).
There needs to be a R rated remake
I think in the 2nd one, he was stuck in a home that was being renovated and had lots of tools. Also, didn't he use a tool chest to chase them down the stairs? (One wonders how he got a 150+ pound chest with hundreds of pounds of tools up to the second floor alone....)
@@Sky-qd2mf oh but there is a R rated version ruclips.net/video/ZgLqxSPIhR0/видео.html
honestly in the two movies they made for that series (the first and Lost in New York) most of his antics would have looked like Saw if the movies were not meant to be family angled with Loony Tunes style injuries. I do not remember where it was posted but a trauma surgeon did once go over Home Alone and the results were pretty much Saw.
@@filanfyretracker yeah, that's what I mean. You don't need to make Kevin a psychopath, just let the injuries be real.
Need to try this with Military Helmet and Motorcycle Helmet
Yes! Seems like this normal safety gear does not offer much protection. Would be interesting if those helmets would actually work.
I could also think of bullet proof vest, how many layers of paper and - once the lake is frozen, how much ice you need to stop the disk.
@@stoffls ice is strong!
and purple helmet
I should have a British army composite helmet somewhere for Lauri and Anni.
Actually I like the idea of testing all sorts of various safety gear in these types of situations just to see how well they help even beyond their rating.
I think it's important to realize that these tests are what happens when an undamaged disk is run at a speed greater than its design. Normal failures occur when a disk is damaged during use and flies apart as a result. I would love to see the damages that occur from a normal "within its design speed" test but with damage due to misuse or other. I love seeing how the differing material behave on impacts like this. Great video. You guys put a lot of great thought and planning into your videos. Keep up the great work!
Exactly my thoughts. A normal grinder would never spin fast enough even if your disk did explode on a normal grinder it would not damage near as much as this video shows. 5X less speed therefor force.
@@isaacodegard740 2x speed means 4x energy
There was a really good annotation on the video though, referring to the fact that the biggest issue is people using this big disks on small grinders without a shield. The small grinders spin faster than big grinders, because they're calibrated to have the same velocity at the circumference of the disk, but with a smaller disk. He measured that they tended to explode at around the same RPM that small grinders spin, so the danger is very, very high
I'm sure they could build a rig that pushes steel against the grinding/cutting disk using springs. Just leave it running until the disk wears down enough to fracture.
@@station240 You wouldn't even need to do that, just clamp it in a bench vise too tight, or else clamp it and hit it with a soft mallet a few times, enough to crack, but not enough to bust it in two.
CIRCULAR SAW CANNON
its like you know exactly what we want :)
I know right? When he said to make suggestions for what to do next, the first thing that popped into my head was pretty much exactly what they showed in the teaser.
On Sunday's Twitch stream, discussions about what other items could be launched from that new air cannon barrel. PIZZA was the #1 answer. Like those stereotypical small, cheap, frozen ones.
Lauri seemed to really like that idea.😊🍕🍕🍕
This is exactly what I wanted👍
Also, a RUclips trick I just recently learned: You can pause a video and step forward and backward frame by frame with the period and comma keys. Makes BTP and HPC videos 1000 times better!
Great idea!
@@garywheeler7039 Thanks :-)
Or more descriptively, the "" keys.
Thanks for that!
Yay!!! Finally learned how to do it!
I'll be right back guys, gotta go put the guard back on my grinder real quick.
Lmao
Good idea. :D
And never ever remove it again
Don Johnson
Yeah good idea.. I had a 5 inch disc explode and despite the guard I still ended up with a dozen stitches in my upper leg. Hate to think what it would have been like without the guard.
@@jimmyj2563 I had a nine inch cutting disc kick back, still don't know how it happened but it cut the back of my hand to the bone and severed two tendons, about six months in plaster and physiotherapy to get the use of my hand back and a six inch scar, I was lucky as I have the use of my hand back, and yes the guard was fitted, nine inch grinders are now just for that.
9:37
You can see the part than went through the plywood still had enough energy to bounce off the wall, and in the other camera you can see that it lands next to the other camera at 7:35
This shows how important it is to stand far away, because even though it bounced off a wall it still had a lot of energy.
It flies like that's what it was made for
Sl4yerkid thank god you put this in the comments or someone could’ve gotten hurt
Sl4yerkid i'm pretty sure the part where they attached a grinding wheel to a 30krpm router showed how important it was to stand far away but ok lol.
@@totalcontrol2025 I know you're being sarcastic, but I fail to see what you're trying to say. Obviously my comment has no effect on the past..
Yeah that thing skipped off the ground and just kept on a-going.
Can you guys try with a shield on the grinder and see how well it protects?
It would just fly over the shield...
@Mr T @10x the operating speed it wont be just twisted/distorted, it'll be torn apart. now, hopefully it'll have absorbed some of that lethal energy.
That is actually the situation which shield meant for. Distance between shield and disk is really close, so it shouldn't be dangerous. I mean exploded disk will not be able gain its lethal perspective, shield will absorb most of the disk fragments and even could not get any damage(bending or etc) . So probably fragments will ricochet out of user
on an actual grinder, speaking as the lucky jackass who DIDN'T take the guard off, I got pelted with tiny shrapnel out of the wheel's plane of rotation, but the guard held and was fine. Big bits were redirected away from me (one came almost tragically close to another coworker 20 feet away, but he was missed and was fine after he changed his undies). On this router, the blades are being spun up to 5 times faster than they're designed to, and I'm not sure how you'd go about attaching a guard for testing, but I would surmise the guard would be destroyed (ruined beyond reuse, not shredded) but it would mostly contain and redirect the parts exploding outward. a theoretical user would be safe, but no one else in the area would be.
@@tashkiira7838 my dad got his hand fucked when the grinding wheel exploded
"Frozen Ice." ~Lauri 2019
“The watermelon really didn’t like the grinding disk” lol
It really looks like the other way around. Of two grinding discs, both preferentially targeted a watermelon.
Quickest way to cut a watermelon that I've ever seen. 😀
The grinding disk doesn't like water melons, that's why.
Better hide behind the water bottles 😆 not a single scratch 👍
Awesome you can try to spin a wire wheel the ones you put on a grinder those are dangerous on a grinder itself pieces of the wire fly off sticking you all the time wonder what it would look like a high-speed they all fly off like little darts of death
Exactly, and put the chronos so we see a top view looking down. The chronos videos in the lab were really cool, one videos looked like blue fire or something like that, I love these videos!
Yeah like you don’t wear sleeves and you have to pull wires out of your arms all day and if you do wear sleeves you run the risk of it getting caught and fucking up your arm
They stick in eyes particularly nicely, I knew an idiot who thought his reading glasses were adequate PPE
Netyr my father?
I left a comment elsewhere before I saw this one. I've had a wire brush wheel catastrophically come apart on me before. Had wires stuck all over my arms and torso. Even had 3 wires pin my sack to my thigh
Your guy's entire channel should be shown at OSHA briefings
Clearly it's bottles of molten ice. This inevitably happens during summer.
Those discs really, really wanted to kill watermelons that day!
How about spinning a carbide tipped saw blade at 30,000 R.P.M.Lauri and Annie??.
Something like a 10" table saw blade!
@@IceBergGeo That would be fun and if it doesn't explode at 30,000 R.P.M.,build a device that will spin it up to 100,000 R.P.M..HAHA!!.
I was going to suggest that too. I feel it would be very mayhem!
And cut through the neighbors house ? Or the one behind it
@@nz5123 HAHA!!.How about the whole block?.
Not proving anything here, spinning a grinding wheel at twice the rated rpm give four times the force.
I'd love to see a diamond cutting disc for concrete explode!
Same idea here. Some of them shake like shit. But hard part will be to spin them fast enough. That small electric motor won't do it. Maybe with gearbox of some kind.
And that silage pit is also no go for this. Metal pieces from concrete disk will bounce fly in any direction.
@@soundspark yes they do, my thought exactly.
Don't know about the diamond tipped ones but I've seen a composite disc explode from a walk behind saw. My uncle was running it. A piece of the disc nearly the size of my hand shot clean through his calf so fast that he didn't even know it till we informed him that he was bleeding
that would be a wonderful and terrible idea both. First off, those blades are very expensive. Second, they're made of metal, not fused particulate like the grinding disks. That means they weigh almost as much per unit volume, and are less likely to snap. Third, those things are HEAVY compared to even a 9-inch grinding disk, simply because they're over a foot across ('small' ones for masonry saws are 14 inches. if you mean the huge monsters used for street work, those are up to 36 inches) and as such have a lot of material to make them. A home router like Lauri was using won't get those things up to speed without the motor failing--I'd be surprised if it got up to 100rpm. So it's a FUN idea but entirely impractical to try.
I love how at 9:44 the part of the disk that went through the plywood is coming back
And then goes right under the legs of the camera tripod at the back of the bunker. A near miss for that camera and tripod.
Nice catch. I didn't notice that until you mentioned it.
I would like to see some more overpowered kitchen appliances. The "Ridiculously fast way to peel an apple with power tools"-video is still one of my favorites! :)
How fast can you make whipped cream?
Would a 10 kW toaster be practical?
Can you instantly boil an egg?
photonic induction!
"The goggles do nothing!" - Rainier Wolfecastle
Soo friggin funny! “ real acid?” - Rainer wolfcastle
Ice or water, frozen ice
-Lauri, 2019
Did you realize that the disc shard that went through the plywood bounced off the concrete and came back? It passes right by the helmet.
"That didn't sound good."
"That was terrible sound."
"Absolutely terrible."
"I think it's going to be really bad."
But....It was really good. Lesson learned. Don't hide behind the plywood.
you get it as well.Hahahaha! I;m not hiding behind the plywood anymore
Lauri: I need another three of those cheap grinders.
Clerk: What are you DOING with these things??
You invented the Amputation Device 5 Million.
Quick and painless :D
Gearloose well... dunno about painless! 🤣
When I see things like this, it makes me think of a guy we knew from auto racing in the late 1990s who raced as a privateer against our factory-backed team, and one summer we didn't see him out for several races. When he did come again, he had a particularly nasty scar in his neck and went on to explain that he had suffered a very serious injury working in his shop alone one night, doing something with a grinder that he shouldn't have been doing. He had to drive himself to the hospital while bleeding rather profusely. He was a very nice guy and we were glad to see him back and thankful that he had survived this terrible incident.
4:54 the damagecheese is overwhelming
"What is the tables name?"
"Block"
Also, damages/dammit cheese😂
Actually is Lack, but Block could be a better name for it, after this..
@@taurielv it's lack of block :D
@@idvarhurd7804 Yes, just that!
I thought Annie said "Black", ie: IKEA just calls it the colour.
6:06 I love how the polycarbonate looks like water when the disc hits it!
that is the key to its strength. force absorption
Standing to the left is still the winning strategy. 3 for 3.
I love how much respect you have for your wife ❤️
Explode a disk with a guard on to see how good it is at protecting you and everyone else
You have pin point accuracy with your grinder shots. 😁
He's 3 for 3; goggles, facemask and helmet.
Think he's using aimbot?
"Frozen ice" well Lauri. I like my Unfrozen ice :P
Un frozen ice here in R Kansas is known as METH.
y'all still drink unfrozen ice? where i live we drink condensed humidity
Remove it from the freezer to Un-thaw.
So many people say that stupid shit. Even after explaining it they just don't get it.
@@rogermarshall8991 Is that like "hot water heater"....? 🤔🤦🏻♂️🤣
Could you weaken a disk and se what damage it does at right operational speed.
The sound of these exploding watermelons is a bit disturbing!
I'm not sure if I like this... lol
Yes, your measurements are quite precise because according to industrial safety standards maximum rotation speed is exactly twice lower than explosion speed. 13600 and 6800.
Is that a safety factor of 4.
@@Apjooz that is results in safety factor of 4 since the centrifugal force goes up in square of speed
Beyond the press : Tip for next test, paint a white line on the disc for easier see the rpm in slo mo.
Lession learned: Forget Helmets, get a 2x2m plastic shield.
I hope the safety people at SAE,ASTM,UL,etc. are watching and taking 📝 notes on this video.
If a worker has one of these"go off"in his or her face,the hard-hat is a joke,that disk makes tossed salad out of your brain and stuffs it in WHATS LEFT of the 👷 hard-hat.
Keep doing all these amazing videos, love all the dedication and skill you guys have put into your content.
Excellent safety warning videos. Don't stop this is "preeetty goood" content
@@midoctor I hope the kinds of people who remove the gaurd and only wear safety glasses with angle grinders will watch this and have a second thoughts. A little bit of convenience or comfort isnt worth the increased risk.
So if you work with a grinding disk, always put a water melon next to you. So if the grinder disk explodes it will go straight for the water melon and you are save.
I love how the disks kill only the safety stuff, in order of how horrifying the wounds would be. Eyes, hairline....
Also, I used a grinder at a job once that didn't have the guard. I immediately hit my finger. The guard is clearly needed as evidenced by these really cool videos, and it should only move to rotate to a better place to protect you.
Yeah. I would have expected the safety stuff to do better than it did. It seemed to slice right through without slowing down significantly. I guess I should get a slab of poly-carbonate and make a face shield out of that!
@@ACat1255 I think the problem is that the energy here is too high for any wearable protection. Even if the face shield stops the disk, all that energy gets mechanically transferred to your head and will probably snap your neck.
@@ACat1255 let's be reasonable here. Those wheels are being spun up by a router with a modified chuck Lauri cooked up. in normal use on a grinder they won't get to HALF that speed. Use your guard, use PPE and don't use dodgy wheels.
@@tashkiira7838 "dodgy wheels"... meaning: don't purchase chinaseum wheels from harbor freight. consider yourself warned.
I'd love to see a collaboration between these guys and Colin Furze.
I've learned 2 things from this video:
1. Face-shields wont do shit if a grinder disc explodes.
2. Exploding grinder discs seem really attracted to helmets.
Today was a good day. 😁
You could always set up a watermelon decoy in the workshop. Any exploding discs should head straight for it🤣
Just like mobile home parks are tornado magnets! :-)
the absolute best moment of this is watching that piece of the 2nd disk that tore through the plywood ricochet off the bunker wall at about 9:38 to 9:54
So, are you saying that I shouldn't run my grinding disk on my router while wearing a standard face shield?
This is really all anyone needs to know about effing around whilst grinding.
I had a hand grinder ( wen I was a kid ). And I hooked it up to a drill & wen it came apart one piece hit me right above my eye ( very lucky ). But boy it felt like it cracked my skull 💀. Knocked me back about 10 feet. Always where safety gear. Cool video. & nice country in the back ground. Looks cold
can't believe they didnt mention the piece that flew directly into the tripod
Lauri and Anni!! You're living on the edge of disaster!!! Stay Safe!!! But Have Fun... It's fun to watch destruction. The only thing I destroy in my home is my cooking LOL... *DON'T TRY THIS AT HOME!!!*
the polycarb looks like a bubble membrane when impacted
A small hit of contrasting spray paint can help monitor rpm. A rheostat to achieve desired speeds. Very informative content... you may be able to sell footage to safety program promoters that cater to workplace training 😃 thank you and good luck
It's worth noting that the fragments appeared to preferentially target "heads".
not really no... if you watch the replays large bits of saw went in all directions
I've had Gouda cheese, Swiss cheese, but not Dammit cheese. Good vid.
"polycarponate"
At least they spelled it like they said it
It's made of lots of carp.
Polin Karpo-naatilla on asiaa.
"Rue-in-ed"
Kyy-4
For the 2nd test, the disk was spinning at 210RPS, 12600RPM when it exploded.
Edited to add: the diameter of the disk is 230mm, so the edge speed would have been 340MPH (Mach 0.46)
Only in Finland can you find frozen ice! Lol
Youve just discovered a new way to play russian roulette 😂 (DONT TRY AT HOME)
Holy shit that thing destroys what ever it touches and doesn't even slow down
Holy sweet Jesus!
And that kids, is why wearing PPE is NOT an excuse to operate tools the wrong way. PPE won’t do any good if you’re using the tool wrong anyway.
One piece from second try was flying to the cars, even passed the camera stand. at 7:20
I had an experience where I had a 230mm blade disintegrate on a 115mm grinder. No blade guard on it, I had on thick gauntlets and the face shield. When it broke, a decent size chunk hit all four fingers on my left hand. The gauntlet prevented a bad injury from being a crippling injury. My fingers were zig zag..
Do not do stupid shit with grinders. They are not your friend irrespective of how skilled you may be with one. I have enough scars minor and not so minor to prove it.
Great informative video!!
Much respect from 🇿🇦
I wish the polycarb would have been hit by the big chunk that sailed easily through the plywood. Would it have survived?
No, it would have shattered. Even the first impact tore the bottom loose from the mounting.
The thing with the wood vs polycarbonate is that the wood didn't flex and couldn't absorb the impact, where the plastic did deflect and absorb energy, so it didn't allow it to go through.
Oh man this video really was way better, and the first one was pretty good!!
I love Anni's cap too -that looks almost exactly like the flame from a flammable liquids warning label that I have!
This channel rocks!
42 seconds after upload. Nice!
I have calculated the speed of the shrapnel (assuming a 9" disc and 10000-14000 rpm)
at 10000 rpm:
119.7 m/s (267.7 mph or 430.9 km/h)
at 14000 rpm
167.6 m/s (374.9 mph or 603.4 km/h)
I'm not a big shop guy but I had to sharpen some drill bits with a wheel at work cuz we were shorthanded. On the last bit, the wheel broke and got me in the mouth. Only took out 3 teeth and chipped 3 others. 60 something stitches in my lip. Turns out maintenance guy had put a wheel in rated for half the rpms that we were running at. Its been a long recovery but definitely feel lucky to be alive. Check your wheels!
Circular saw, whipper snipper blades, grass trimmers and would be even better👍👍👍👍
So here's me thinking at the end of the video "Well maybe you could put a saw blade in, no that's too dangerousm even they aren't that crazy"... then I see the preview for next week's video. Wow. Bonkers xD
Try some metal disks with sharp edges, machine it the way that at around 20000 rpm the disk will get split into pieces and will cut anything on it way. This would be the most dangerous weapon in the world
Can you set it up next to the concrete wall? I want to see the results
I just ordered the best poly carbonate face shield I could find. Gonna get another for my son. We don't use a 9" grinder but I had a 41/2" disc grenade on me. The guard ate the explosion but it could have been a really bad day. Face shields are cheap compared to plastic surgery and glass eyeballs.
You should start playing the lottery!
How high are the chances of hitting the most interesting target THREE times?
I am just really good on aiming with my grinders :D
Love your videos! I had an experience with a bad collet in a router. The 3/4" (19mm) router bit came out at top rpm and shot out, it went through a 2x12, 2 meters away and was never found again.
Wow what a mess...
Its OK Most of the shrapnel is in my face.
Is wondering what the semi square concrete walled areas was originally for.
Ooh do the blast sheild, car door and other stuff vs a stone grinding wheel..
I've seen a grinding stone explode from grinding aluminium and it's brutal... 🤔
Can you get a skull (ex., of one of your enemies - or failing that maybe a pig) and see what happens when a disc hits it directly and when it hits it after going through a helmet or face shield? The helmet was pretty much destroyed, but it may have reduced the speed of the disc enough to prevent it from going through bone.
what about 14in blades. We use them all the time with our gas saw. Those are nasty when they explode!
Have you exploded the thicker bench grinding wheels?
Just as a suggestion, if you're doing this sort of thing, some white paint in a stripe on one side would let you calculate the RPM easier, with luck.
Did you notice the piece of disc that went through the plywood and bounced off the concrete wall came back under the safety helmet?
You can clearly see watermelon abuse! I have reported them to the fruit labor industry head dude!
(Haven't made it through the video yet)
But perhaps you should see how the grinder shield would handle this over speed also
I want to see what happens with the guard ON! If a hard hat and a face shield can't stop the disks, can the guard ???
you should also have a shot with the guard on to demonstrate how much more effective the guard is for safety.
Try a 14" cutting disk from metal chop saw 😈😂
what is the chance that the grinder guard will last? Put on the grinder guard and check that it can withstand.
Paint a white spot on your disks. You will be able to calculate the fail rpm.
I love these grinding disk videos! Fantastic!
I love the Finnish accent. its such a unique sounding thing.
Replace that router with a grinder and "overclock" it with a variac and it'll spin much faster before breaking.
The vibrations of this janky setup is keeping it from reaching its true potential :)
Wish there was a way you could design a device that can harness that energy and launch them at objects or distance somewhat accurately. Awesome video and very educational. Kind of a eye opener for anyone who underestimates the damage a cutting or grinding disc can do.
If i calculated correctly, the shrapnel, which hit the blast shield plastic, took 23 frames (0,00644 seconds) from breakage to hit. Calculating from the disc diameter (230 mm) the distance from breaking point to the shield is about 1,2 m. So the shrapnel flew about the speed of 186 m/s, which is 670 km/h or 416 mph. Double-checking 13600 rpm (227/sec) and 0,72 m circumference makes 163 m/s, 587 km/h or 365 mph, which makes sense.
...And if a third of the disc weighs about 200 grams, the momentum in 163 m/s would be 32,6 Ns, which is quite equal to direct rifle shot. en.wikipedia.org/wiki/Newton_second
I would like to see some of the large, 25mm thick grinding wheels overspeed, they are massive compared to cutting discs.
Gonna go put the guard back on my grinder now!!
put an angle grinder shield on and spin it and see if it really protects
This is why you ALWAYS need to check for the maximum safety rating when using personal protection equipment (aka PPE) when working and replace them after an indecent, even a small one. I've seen people using a yard trimmer/weed-eater without safety glasses and worse; another person I saw wasn't wearing safety chaps while using a large chain saw......
I've honestly never seen anyone wear safety equipment while using a weed eater or chainsaw (aside from cheap sunglasses sometimes) *and I'm a professional landscaper* lol
Fun with centrifuges? Just an idea; not sure it's a good one.
damnit cheese?....oh, damages. love the videos