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

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

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We’re working on a time-series problem called a Sequence Classification. Recurrent Neural Networks called Long Short-Term Memory (LSTM) networks are good for that. It’s what they use for natural language processing because it can remember context from the sentence you’ve just spoken. In this case its used to analyze not just the current timestamp of data, but what has been happening for the last 20 – 250 ms, which helps to reject false alarms.

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67 Responses

  1. animalmother556x45 says:

    ……….am I the only one disappointed that they removed the safety guard? I really wanted to see how quickly that will fall into place.

    • animalmother556x45 says:

      +iOS gameplays …..ummmmm…I literally know ZERO people that have taken the blade guard off. That includes about 15 contractors who use one professionally.

    • John H Baumgaertner says:

      +iOS gameplays Maybe people you know do that. I would not call that a “normal” practice.

    • scott morgan says:

      animalmother556x45 usually framers or a dedicated cut man will wedge the guard up. Sometimes thin or profile cuts can’t be done without the guard being manually held open. The angle of approach makes the guard push the saw over instead of opening the guard.

    • Fix It says:

      You’re not the only one man

    • Fix It says:

      iOS gameplays If someone removed that while working for me would be FIRED!!

  2. jlhillmann79 says:

    Can you now direct your brain power towards the mandated “spill proof” gas can nozzles? It’s an infuriating example of safety bureaucracy run amuck! I’m all about safety, and understand the hazard they’re trying to eliminate, but every “solution” I’ve seen/used actually causes more spillage.

  3. Mike Forsythe says:

    I see you have the blade guard locked back…. OHSA is not going to be happy!!!

  4. Shanda Feuchtenberger says:

    Just out of curiosity why is the blade gaurd disengaged? I worked carpentry for a while and as long as you are paying attention and using the saw properly (both hands!) kickback can’t over power you (you would have to be very very weak).

    • elninonitro says:

      I think this is really good. Any device that increases the safety without infringing on operability is excellent. Yes if treated with respect the tool is much less likely to become an amputation tool but every bit helps, especially when it comes to less experienced operators. Think anti-collision on cars. People have used brakes with great success over the years to avoid collisions but a bit of extra tech helps reduce these occurrences even further.

    • Florian Mickler says:

      I guess it is a safeguard so that you don’t have to be a professional to use a circular saw…

    • ILikeWafflz says:

      +elninonitro I understand the logic behind trying to develop features to increase safety in the usage of inherently dangerous things, like saws and vehicles. However, aside from basic and obvious stuff like crumple zones in car frames and blade guards on saws, if you start going too far, you run the risk of operators becoming too comfortable and relying on the safety features (which can and absolutely will eventually fail) instead of developing a feel and operational sense for the tool or machinery, which might lead to _more_ accidents than if it was never implemented. I feel like the most egregious example of going too far is all of the automatic braking being put in vehicles. A skilled operator is much more reliable than a piece of technology.
      Yes, you can tell people “be careful and pay attention anyway” but the stupidity intrinsic to standard human psyche is going to take that with a grain of salt.

    • J Salameh. says:

      Usually the material kicks back not the saw.

    • Shakrii says:

      Would like to point out that while you can normally resist the kick-back with two hands on a circular saw, there are times where I am forced to make a cut with some of my saws where I could not stop (although my position means that an occurring kickback wouldn’t actually threaten me). Also the cost of the sensors they are talking about are very cheep (although the cost due to patent and design *shrug*) and you already have integrated circuit boards into the saw. You want to look at waste of money look at some of the current building codes. Now I will agree that cuts I make with my circ saws are not the ones where I am normally concerned about my safety.

  5. Deacon Konc says:

    Nice to see a plug for Seveneves here. Heartily recommend this book or any by Neal Stephenson

    • peteman1000 says:

      Same. I listened to it over the second half of last year. It was amazing. All I could think about was what a good a TV show (or movie series) it would make.

    • guitarchitectural says:

      +peteman1000 i though the same while reading the three body problem trilogy!

    • peteman1000 says:

      +guitarchitectural I’ve heard really good things about those books, but I have too much of a backlog to get through first. Listening to the Dark Tower series now (drawing of the three atm). That’s one that could be amazing on screen, but the movie was very disappointing.

  6. Bored.In.California says:

    Now there’s a fun word to say.

  7. electronicsNmore says:

    A very useful invention! Great work.

  8. Dynamic Unreality says:

    This is absolutely amazing, I love getting to see practical science alongside some of the other, more ethereal topics on your channel. This will save lives, congratulations. And your enthusiasm is infectious, it makes me want to share every single video.

  9. Tony Tuite says:

    “Gonadular region” is now part of my vernacular. But more importantly, this may save countless Gonadular regions from unexpected saw-based intrusion…

    • Deoxal says:

      I’m curious to see what the firmware looks like as well as their framework that compares that analyzes incoming the incoming data. Guess I’ll just have to wait for the next video.

    • John Razor says:

      …’saw-based intrusion” —— nice!

    • Tony Tuite says:

      +John Razor the only thing worse than saw-based intrusion is unexpected saw-based intrusion!

    • Sam DubbleU says:

      Couldn’t you have also installed a safety button at the base of the saw that when set of the wood, would allow the blade to spin, and when released would trigger the braking system. Maybe the placement of said safety would be a problem, but otherwise I feel this would work.
      Please correct me if I’m wrong.

    • Bruce Leadbetter says:

      It will heretofore be in mine as well…

  10. FetchQuestAssigner4423 says:

    I totally downloaded audible to read that book lol

  11. ShadowZone says:

    I absolutely LOVED Seveneves! One of the best books I ever read.

    • SmarterEveryDay says:

      I think about it ALL THE TIME

    • Kirill Iartsev says:

      Would’ve been nice to connect machine learning to Ksp, right? If cracken starts to become angry just start a timewarp. Like, similar thing to this, i think.

    • ShadowZone says:

      +SmarterEveryDay I can totally get that. The wonderful thing about it is not only the fantastic world building and feasibly technology, but also how optimistic it is about human perseverance despite all our flaws, which it still addresses.

    • SilentProgram says:

      +ShadowZone I really loved the first half of the book, but then the uninvited guest really crushed my enjoyment with her destructive politics. I fought my way through another chapter or so, but then I couldn’t muster any more motivation to continue. Does the positive mindset (despite the extinction-level event) of the first half come back later in the book?

  12. ALIVE845 says:

    There’s also supposed to be a spring loaded gaurd to cover the blade when its removed from what youre cutting.

    • VladZ says:

      That’s what I was wondering, pretty sure they made that for this purpose and when you you accidentally press the trigger when not I position. They should of recorded a slow motion of how fast the cover responds to a kick back.

    • Shakrii says:

      While the guard should be enabled there are times during kickback that the spring is way to slow to return the guard to rest position (have run into the issue although never with an injury). Secondly this idea would help protect the user in the case that you have to disable or manually hold the guard open (which happens quit a bit in construction.)

    • Mykl Langridge says:

      +VladZ Good to see I’m not the only one wondering about that!

  13. MonkeyspankO says:

    cool, when can we buy it?

  14. Sam Christopher says:

    Man, this is so cool. My dad and I have woodworking tools in our garage, and I’ve worked on countless service project(and Eagle Projects) and this would be so freaking useful. Just knowing that there’s a safety mechanism implemented digitally as well as mechanically already makes this 10 times more useful than one of those “smart fridges”

  15. K1ngjulien_ says:

    *Sawstop wants to know your location*

    • Aravzil says:

      Isn’t sawstop used when flesh is touching the blade? If you were to combine those two systems it could be amazing.

  16. आदित्य Aditya मेहेंदळे Mehendale says:

    Wouldn’t a more robust detection come from sensing the load on the sole-plate of the saw? It _is_ lifting off..

    • Mike Guitar says:

      Great idea. Just use a little “microswitch” as an “interlock”. I guess it could go in front.

      Now *this* is affordable enough to add to a circular saw.

  17. Jttv says:

    I may or may not work at one of the major tool brands. I am impressed. All I can say is if you sell, sell to all the brands so it does not get stifled in the courts like the 2 sawstop technologies.

  18. Jay Malone says:

    Please tell me that that isn’t blood splatter on the ceiling at 4:04 lol

  19. Chad Green says:

    Also, #gonadularregion is safe!

    • Chad Green says:

      +ramzekeleviathan You’re right, it’s always the back edge of the blade. That’s where the blade starts digging in and lifting the saw off the table. And yes, there are passive solutions, like you say, like a riving knife. This doesn’t replace those. Why not use both? Once you see it work, it just kind of seems dumb that it’s not already there.

    • ramzekeleviathan says:

      +Chad Green of course! I never meant to make it seem what you have done so far to be stupid, its pure genius and I applaud you for your efforts so far!

    • Bakaneko says:

      This type of kick back prevention has been used in some hand drills. Older ones use only torque spikes to detect drill jams, but new ones have also acceleration sensor. Bosch DDH181X is one example.

    • Sethjxl says:

      Very interesting. My Metabo brushless drill set have anti kick back where they detect acceleration and cut power straight away. One of the issues is you cant tell if it has torqued out or if it just stopped a kick back event which gets annoying. However, they don’t have anything like this in their saws and they easily could….

  20. Fix It says:

    Why did you disable the blade guard? Saw comes out of the work and the guard covers the blade, simple, no electronics to fail. My saw had it from the factory.

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