Circular Saw Kickback Killer (We used science to make tools safer) - Smarter Every Day 209

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  • Xuất bản 17 Th02, 2019
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NHẬN XÉT • 5 997

  • Chad Green
    Chad Green 3 tháng trước +1727

    Also, #gonadularregion is safe!

    • Antonio Claudio Michael
      Antonio Claudio Michael 8 ngày trước

      +ramzekeleviathan knots in wood can cause kickback

    • jay dellinger
      jay dellinger 12 ngày trước

      +Schwurbel kickback is the result of the saw flinging wood or the saw it's self back or forward. 🤦

    • John Doe
      John Doe Tháng trước +1

      a riving knife or wedges are far simpler solutions. likely safer too as they wotn fail

    • Photon
      Photon 2 tháng trước

      This is a neat idea! If I may ask, what does the hardware look like on the inside of the saw? Does it somehow transmit the data from the sensors or does it run the algorithm locally? Does this massively increase the price of the saw? Finally, how would you prevent it from learning about jostling during shipping? Does it just wait for power to start, and then stay on for some amount of time after the trigger is let go?
      Sorry, it's a lot of questions. But again this is a really neat example of how ML can be applied to devices we've had for decades. Cool stuff!

    • Shaun Jeffs
      Shaun Jeffs 2 tháng trước +1

      It seemed that the built-in saw brake had a significant delay before the blade actually came to a stop. Those blades can be very dangerous even if not spinning at full speed. I'd be interested to know from your HS data whether the brake is capable of stopping the blade before it reaches flesh. It looked like at 80-100 ms, the blade is already in a position to do some damage if you had and ill-placed finger in the blade path. (And yes, I know folks, you should not have your hand there in the first place, but guess what, people do it anyway, and they pay the rest of their lives for it). This is an interesting approach that is quite different from SawStop. You are attempting to prevent the dangerous contact in the first place as opposed to minimizing the damage once contact does occur. There are also many comments on here about the spring-loaded blade guard. I'd like to see in your video how quickly a guard would respond under a kickback scenario. My guess is it probably won't be able to retract in time, as this is a very quick, chaotic event. Good research though!

  • garycsfunlife
    garycsfunlife 5 giờ trước

    Don't take off the blade guard and hang on with a little muscle and problem solved and it's free 😁

  • Jwk Johnston
    Jwk Johnston 9 giờ trước

    So awesome can hardly wait

  • Sledge Hammer
    Sledge Hammer 19 giờ trước

    Great! They'll be even more money now

  • Orlev Novel
    Orlev Novel 20 giờ trước


  • Crazy Funny Cats
    Crazy Funny Cats 21 giờ trước

    No gloves 🧤 ?7:55?
    Crazy Russian Hacker has cool dogs 🐕
    Safety number 1 pwiowity

  • Jonathan Mellodge
    Jonathan Mellodge Ngày trước

    Is it a cost effective alternative to common sense?

  • John Gilmour
    John Gilmour Ngày trước

    How about measuring rate of change of motor current. A ROC 《 x = brake.

  • smiley
    smiley Ngày trước

    How much more would it cost.

  • ChaosTherum
    ChaosTherum Ngày trước

    I want one of these now. My uncle does a lot of woodworking and would love something like this. Honestly, something like this should never be patented it should be open source but here comes me and my open source ranting.

  • IsaacandCorrine Collura
    IsaacandCorrine Collura Ngày trước

    I’ve been in carpentry for 16 yrs... I can run my cordless skill saw in either hand hanging upside down by my toe nails 30’ up while talkin on the phone (ok slight exaggeration and safety is important to me, but I’m like a 39 yr old essential craftsman!!) and there’s some really dumb stuff out there to make everything so safe you can’t ever get anything done... but THIS IS AWESOME!!! That’s a money maker right there. Love the channel... so do my kids!!!

  • Bill the traveler
    Bill the traveler 2 ngày trước

    ☡ I've had a kickback. I didn't like it. Once the thrill is gone then it's time to turn and puke.
    You are the Heros of Hardware. 👍

  • Suma_ket
    Suma_ket 2 ngày trước

    ok, so i used to work these in europe, and the saw itself is turning the other way around basically...i don't know who would be stupid enough to use one of those..indeed very dangerous.. just make the blade go the other way and its already 50% safer no ? i'm almost a 100% positive it's the first time i see a saw like that spin towards the user..haha incredible.

  • BomberTheGreat
    BomberTheGreat 2 ngày trước

    Patent and License it!
    And do it quick before someone is stealing that

  • robin Pletcher
    robin Pletcher 2 ngày trước +1

    Does this happen if the blade spins the other way? Is it a worse cut if it spins the other way? Am I missing something here? The way my skill saw spins it would kick forward, it also has a guard. Never experienced this.

  • Bob Young
    Bob Young 3 ngày trước

    some of the best inventions ever were made in a gurage.

  • Tin Man
    Tin Man 3 ngày trước

    Perhaps this has already been mentioned, I admit to not having read ALL the previous comments but while this is a great additional safety feature (that is completely transparent to the user in normal use - bonus!) my personal rule as an occasional user is to never let the saw out of the cut until the blade has stopped. My would-be kickback events simply become smoky black areas of the cut as the bound up blade bogs out the saw.

  • Goldeye666 Hellfish
    Goldeye666 Hellfish 3 ngày trước

    Mine has a blade guard on it, I'm not sure that I would have to worry about this situation from happening. As soon as the blade gets pushed out of the wood, the guard closes

  • mike Cummings
    mike Cummings 3 ngày trước

    Dewalt has this already

  • Parimal Udapurkar
    Parimal Udapurkar 3 ngày trước

    Why not simply have the blade turning in the opposite direction so that the "kickback" just pulls the saw further into the wood?

    • mattystewart8
      mattystewart8 2 ngày trước +1

      Because then the saw wants to flip over while youre using it. As well as the saw wanting to come away from you while youre cutting meaning you could loose it

  • Blue Pearl
    Blue Pearl 4 ngày trước

    I really could have used that safety when my finger was cut in half & my employee lost his finger due to kickback

  • Joe Conforti
    Joe Conforti 4 ngày trước

    Every circular saw I ever bought has a guard on it that keeps the blade from cutting you. If you remove
    the guard your asking for a trip to the emergency room. This invention is reinventing the wheel.
    Sounds like you took a $39.95 saw and made it a $59.95. Reminds me of the paperless office.

  • Dona Harrell
    Dona Harrell 4 ngày trước

    Holy cow!

  • Lukas Götz
    Lukas Götz 4 ngày trước

    Great video, but i dont understand why a neural network would be the right approach for this kind of task

  • Robert Spencer
    Robert Spencer 5 ngày trước

    No, for real, this guy deserves to be a millionaire!

  • SlushEye
    SlushEye 5 ngày trước

    Thats not even a strong kickback, im a carpenter from germany and we have circular saws with 18 inch blades or 45 zentimeters, these saws have a real kickback if you handle them wrong.

  • I'llOnlyLet UDown
    I'llOnlyLet UDown 5 ngày trước


  • philricotta
    philricotta 5 ngày trước

    I don't make many comments on videos but I had to say that THIS IS VERY IMPRESSIVE. If you never had a kickback event with this option installed you would never know it was even there protecting you....which is the ideal situation for any safety device.

  • Homeless Canadian
    Homeless Canadian 6 ngày trước

    Mine comes with something like this- it doesn't have enough torque to kick back enough to be a threat

  • Kyle Johnson
    Kyle Johnson 6 ngày trước

    I would not like this it will only make it harder to do your jobe it has a gard ill take my chance

  • mgunter
    mgunter 6 ngày trước +2

    Can't you just tie it to a pressure switch on the guard plate so if it's not pressed down it shuts off faster than human reaction which is about .5 second for NHRA drivers.

  • natetaylor23
    natetaylor23 6 ngày trước

    OK Kick back is not that big of a deal.

  • Bruce Alan
    Bruce Alan 6 ngày trước

    So, would this prevent me from dragging the saw sideways, hogging out a lot of material. Im pretty sure it would. This is a weekend warriors safety mechanism. Cool video though! Remember folks, safety is between your ears :)

  • dracoslayer16
    dracoslayer16 6 ngày trước

    I like the idea of this but I don't have high hopes of it being adopted into major tool brands. Circular and worm-drive saws have several systems already in place for this issue, plus safely operating the saw calls for always using two hands on the saw, never having anything behind the saw, and always support your work piece. It's even required by law in the US that all saws not only have guards in place but that "any saw ever made" will always have replacement guards available from part manufacturers. Even 25+ year old chop saws you can still get brand new guards for.

  • Max Chill
    Max Chill 6 ngày trước

    I'm a carpenter, kickback is user error. Little innovations like this are neat, but every time you experience kick back it is your own fault. Personally I much prefer left sided blades that are battery operated with electric brakes over the old side winders. Your blade should never pinch when cutting plywood, the smaller piece always needs to fall away from you to avoid it.

  • Dennis Lubert
    Dennis Lubert 6 ngày trước

    did you seriously blur out the code?

  • Corey Black
    Corey Black 6 ngày trước

    Who else can actually smell the wood they're cutting?

  • Griffin Finnane
    Griffin Finnane 6 ngày trước +1

    please make this for a chainsaw

  • CyBa SinBad380
    CyBa SinBad380 7 ngày trước

    Why doesn’t it spin the blade the other way so it runs away from the persons body

    • nota virgin
      nota virgin 6 ngày trước

      Pulling the wood towards you is safer than pushing it.

  • duitfoto duit
    duitfoto duit 7 ngày trước

    Riving knife

  • Abu Bakr
    Abu Bakr 7 ngày trước

    why the 1.7k dislikes? i honestly dont understand

  • J B
    J B 7 ngày trước

    Call it Madds Mikkelsen for short

  • Axl Mizzi
    Axl Mizzi 8 ngày trước

    Isn't there already a spring loaded guard on them for this reason?

  • Isch bin de Kalle
    Isch bin de Kalle 8 ngày trước

    Fake. Completely fake

  • jackass315
    jackass315 8 ngày trước

    i love it , i want one , i hope yall get some money for this , this would be great on routers too , dangerous little buggers when you hit a knot , would save some otherwise broken wrists for sure

  • Tom R
    Tom R 8 ngày trước

    2:40 are we forgetting the user is still holding the device?
    Surely the saw can't jump the distances you've portrayed.
    Either you tense up and of course still hold the saw, or you let go of the button/saw - You can't have your cake and eat it

  • Antonio Claudio Michael
    Antonio Claudio Michael 8 ngày trước +1

    Amazing video guys

  • Antonio Claudio Michael
    Antonio Claudio Michael 8 ngày trước +1

    I think this technology would be amazing in dewalt and Milwaukee cordless brushless circular saws

  • conexant51
    conexant51 8 ngày trước

    Watching the first 3 minutes made me think up a much simpler solution, and it's gonna cost just a fraction of this.

  • Wolfgang Amadeus Van Beethoven

    What about the fact, that circular saws, come with a guards. Which is a solution for the problem already and way cheaper to produce.
    Would love to see comparisons of guards vs your brake.
    A real test to see if the brake is worth the extra money in development, production as well as at the store for the consumer.
    Love what you do keep up the good work.

    • Roderick Spiteri
      Roderick Spiteri 6 ngày trước

      When a kickback lodged the blade in my finger, the saw came at me faster than the guard spring could do its job... lucky the finger bone got between the wide saw teeth and jammed the motor... and only then did I realise I was still holding on to the switch. 5 stitches later and all was good. I was really lucky!

  • Star Kicker
    Star Kicker 8 ngày trước

    would be more useful in a chainsaw

  • Star Kicker
    Star Kicker 8 ngày trước

    that happened to me while i was 2.5 stories off the ground on a pitched roof with no safety harness or anyone around...but i just forced the saw to stay where it was. because im a man? lol

  • Patrick Connolly
    Patrick Connolly 9 ngày trước

    porter cable made a circular saw many years ago(i have one) called a "Speedtronic'' used a microprocessor that regulated the speed of the blade relative to it's resistance in the would speed up or slow down as was necessary and you never had ''kickback'' but it was not popular with most carpenters and they wisely put a switch so they could bypass the microprocessor.....most liked the higher revving unregulated speed that they were familiar with.....i found it to be the best saw i ever used and use but alas it was and is will out cut most of the modern cordless saws still...lotsa torque

  • Nerevar22g
    Nerevar22g 9 ngày trước

    i use a handsaw

  • Number White
    Number White 9 ngày trước

    I got 5 deep scars on my right thigh due to kickback on one of these saws. Had to borrow skin from my left thigh for 2 of the scars. It's pretty dangerious even for a full grown man. I want you to licence this for tool manufactures. ;)

  • Jack Caven
    Jack Caven 9 ngày trước

    Bullshit .... the only reason it's rising out of the wood is because nobody is holding it ! been using them for years and know people who have and ... no problem

  • Tbnrkaden
    Tbnrkaden 9 ngày trước

    You don’t cut that way

  • Abteilol
    Abteilol 9 ngày trước +2

    You first demonstrated with a saw that is missing its blade guard, something most saws these day come with, you then showed a modified saw WITH a bladeguard. why didnt you show kickback behavior with a saw that has the bladeguard installed? is it also not quick enough? i understand that aditional safety is nice, and i imagine the sensor is small enough and cheap that the added safety feature would not impact the final costs of a saw with this feature, still, would like to know how the original feature performs to kickback.

  • GuiltyMalice
    GuiltyMalice 9 ngày trước

    I’m a little late to this video but guys this is friggin awesome. There are obviously some safety features already implicated in these saws main on being the spring assisted blade guard, but they don’t always save fingers because if they did we wouldn’t here or see people missing a digit or so from any mishaps pertaining to the use of the tool. I myself have luckily stayed safe enough not to have this happen but witnessed my uncle ripping a sheet of plywood and the saw kicked back severing his thumb. Now he can hitch around corners due to it being sewn back on crooked lol. I know it’s awful and I wouldn’t be laughing if it were me. Truthfully I couldn’t laugh about it for quite a while due to witnessing the event first hand. It was awful but I’m happy to say his thumb was saved and he is still very much in the business today as this had happened some years ago now. I’m rambling now so I’ll stop. I just mean to say that this is incredible and if the technology were in the saw that day he wouldn’t be wearing that scar and he’d have to hail a cab like everyone else. Awesome work guys I really hope to see this tech implicated in future circular saws as well as many other tools. Thanks for sharing.

  • UserName117
    UserName117 10 ngày trước

    all that matters is 1 thing. How much does it cost to add it to the tool? If it turns a $200 saw to a $400 saw i'll pass.

  • Bryn Dunbrack
    Bryn Dunbrack 10 ngày trước

    I know your aware of this already, but you are brilliant !

  • AJ Ramos
    AJ Ramos 10 ngày trước

    If manufacturers don't snatch that up, would y'all consider offering a service in which we send in our saws and you guys install your device and send the saws back to us? Or is it something you could sell as a standalone product that the user can install? This just seems like an incredible leap forward in the reduction of workplace injuries.

  • AJ Ramos
    AJ Ramos 10 ngày trước

    5:12 wow great job guys

  • David Tuttle
    David Tuttle 10 ngày trước

    The unfortunate thing about this is it’s going to jump the prices of the circular saw like $200

  • Rafal D
    Rafal D 10 ngày trước

    This might have been a mistake to pit on youtube, someone could beet you to a patent.

  • Christoph Rittweger
    Christoph Rittweger 10 ngày trước

    please google "Spaltkeil Handkreissäge"

  • ncsugray90
    ncsugray90 10 ngày trước

    Seems like something that would fit great into SawStops products, even though it uses an entirely different method of detection

  • soberhippie
    soberhippie 10 ngày trước

    Just out of interest, why not add a switch that is activated when the saw is pressed to the surface of the wood, in the lower plate?

  • pyroarchy
    pyroarchy 10 ngày trước

    some ppl just dont need to use tools at all lol

  • mastershake42019
    mastershake42019 10 ngày trước

    Best prevention is to never have anything in the line with the front or back of the blade. Having a habit of gripping it good also helps.

  • Danny M
    Danny M 10 ngày trước

    grinders are worse.

  • Robert Hachten
    Robert Hachten 10 ngày trước

    They make a tool for ripping long lengths....its called a table saw.

  • RidgeLine Design
    RidgeLine Design 10 ngày trước

    Nice but you could just not be a dumbass and never have a problem. Why don't you guys work on something important and meaningful like a cure for liberalism.

  • Dee L
    Dee L 10 ngày trước +1

    That wasn't a piece of Plywood, It was a piece of 2x8 Preasure Treated

  • William Arrington
    William Arrington 10 ngày trước

    We normally just lay it on the ground ontop of foam insulation. It cant sag and you can walk the middle of the board behind the saw as it goes

  • Dan R. Graham
    Dan R. Graham 10 ngày trước

    What is a wide clamp style was applied to the back end of the board to keep it from closing in on the saw blade?

  • Kevin Scott
    Kevin Scott 10 ngày trước

    And u do have a good idea sir. Im not trying to interrupted. Clutch. In circulation saw is a dam. Scarest thing in hand..

  • Kevin Scott
    Kevin Scott 10 ngày trước

    Tabel saw. Only diamond bits. Cop saw. Radio alarm?. If u go cheap this will be..

  • Kevin Scott
    Kevin Scott 10 ngày trước

    I have used a worm saw my hole life. No never kick back. Them says r. No good

  • Ip sissimus
    Ip sissimus 10 ngày trước

    Yeah, this would have saved me a few brown trouser events. Now if we can just apply something like this to surfacers and spindle moulders then even I might hit retirement with all of my fingers. I've already mangled the end of both thumbs, and at 46 I've still got way too many years to go. It ain't looking good, people. Not terrible, but not great either.

  • the D. Willy
    the D. Willy 10 ngày trước

    Lots of tests run in that garage. You can tell by the blood on the ceiling at 7:59. Great invention, guys! Cool video, too.

  • Aaron Degerstrom
    Aaron Degerstrom 10 ngày trước

    I think if you actually know how to use one this is not an issue

  • Austin Steingrube
    Austin Steingrube 10 ngày trước

    I guess I'm a bit lost in why ANN were used for this. Neat idea, but this can be done with some pretty simple DSP techniques with much higher certainty without the risk of biasing the behavior via human samples.

  • Josh Bean
    Josh Bean 11 ngày trước

    Could something similar be developed for a table saw?

  • Rogelio Muñoz
    Rogelio Muñoz 11 ngày trước

    This is cool but I only see homeowners buying this, not any companies or actual Carpenters and that's where the money would be if you make a tool you will need to sell it to industrial companies to make the big bucks

  • Guns and Wood
    Guns and Wood 11 ngày trước

    And up go the prices of saws. Yippy.

  • tankerboysabot
    tankerboysabot 11 ngày trước

    So lets say i take the saw without being on wood and jerk it forwards would it stop it from working?

  • The Satanic Gamer From Hell
    The Satanic Gamer From Hell 11 ngày trước

    But what if the jig saw killer wants kick back in his saws ? ;)

  • Phillip Roc
    Phillip Roc 11 ngày trước +1

    No, you just need to stop holding the saw like your little sister. Is something my dad would say.

    • Tom R
      Tom R 8 ngày trước +1

      Exactly, or in this case a free flowing chain with next to no resistance 😂

  • mhphotography08
    mhphotography08 11 ngày trước

    super stupid video

  • Flashulence
    Flashulence 11 ngày trước

    Why isn’t there just like a guard that holds it down to the wood. Like it’s adjustable loose clamp

  • sam hill
    sam hill 11 ngày trước

    A firm grip on the saw works pretty good too.

  • Yoru Hana
    Yoru Hana 11 ngày trước

    Or maybe put a contact switch under the plate cheap easy and can be even put on exsisting saws.

    • Tom R
      Tom R 8 ngày trước

      Bad idea

  • John Arizona
    John Arizona 11 ngày trước

    Running a circ through a cheap power strip HAHAHA 2funny

  • Anthony Diaz
    Anthony Diaz 11 ngày trước

    But the blade garde. Do it with the blade garde active.

  • Adam Manley Densmore
    Adam Manley Densmore 11 ngày trước +1

    May I suggest you work on Angle Grinders next. The blade broke on one, produced kickback and now my brother looks like Tyrion Lannister.

  • Joshua Earl
    Joshua Earl 11 ngày trước

    I like the thought behind your idea but imho it's unnecessary and will just add more expense. I've always been taught to stand to one side when using a skill saw and to make sure I don't trap the blade when cutting using appropriate cutting bench & clamps. You're trying to make a tool idiot proof that should never be used by an idiot. The only half decent use case for this would be in schools.

  • MyCatInABox
    MyCatInABox 11 ngày trước

    This is...really, REALLY good science.

  • woppini
    woppini 11 ngày trước

    12 years when really all one need's is common sense and two hands on the saw. If one can't figure this out they shouldn't be using the saw to begin with

  • Shawn Blanchette
    Shawn Blanchette 11 ngày trước +3

    Being a general contractor, I've felt my heart stop a few times while using saws! Saws (including table saws and reciprocating saws) are very dangerous -- even when used correctly.
    I use DeWALT, and my business partner uses Milwaukee, and we would both like this technology in our saws! All of our saws. I named those brands specifically so this comment may show up on their radars!
    Now, if only these guys could come up with a hammer that doesn't hurt when you hit your finger! Fortunately, that's rare for me nowadays.

    • Max Chill
      Max Chill 6 ngày trước

      Yes please, hammers with electric brakes!