How The SawStop Safety Feature Works - WOOD magazine
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- Опубліковано 3 лип 2020
- The SawStop safety system is designed to keep the operator safe from injury in case of physical contact with the saw blade. To date, this is one of the safest table saws on the market but just how does it work. WOOD magazine's Bob Hunter explains the mechanism, how it works and sacrifices a blade and cartridge to show you exactly how fast it reacts. Hotdog, you're going to like this!
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This is one of the most creative and innovative mechanisms out there. It almost seems like sci-fi considering how well it works.
Agreed 👍
the author does like to from scratch, shaping and trimming wood from large blocks into fine finished products. ua-cam.com/users/postUgkxD-QRFQz730FJEh4f9BYSf-nkIMIC9hL_ as another reviewer mentioned, most projects require a lot of high-dollar equipment that most of us dont have the room or budget for. But, knowing how to do these things, even if we wont be able to practice the full stack project, is still great.
that is great.. won't stop the sudden slip with force from cutting your hand but it was so fast that a slip like that will probably take a few stitches instead the loss of a few fingers.. God has been good to me over the last 68 years (50 of them working with wood) I still have all my fingers and toes..
Must have been a great pride and honor in that, sir
@@colinhenry__ not at all.. just luck and a little divine providence ..
@@tinkmarshino was there any day that when you reflected on, it was like "man I almost lost a finger when my hand slipped"?
@@lethaihien12345 Not really.. I was always aware of the possibility so I always made sure I was as safe as I could be.. Never "almost" lost one.. Not in over 50 years of using many different saws.. Even when I was in a position of a possible saw buck (and that has happened) I made sure it was safe for me. Though accidents can happen. Thanks for asking.
why would you lose a toe?
Bought this for my friend for his birthday, and he loves it. Father-in-law was a little jealous, even. :) Built solid, but light enough to move around for projects. Easy to use ua-cam.com/users/postUgkxPeGkHOMe05FySypTOvYumxMn-xi39oRe and makes great precision cuts. Doesn't come with a laser mount, but the fence is straight as an arrow and if you measure carefully, it's not a problem. Can handle dimensional lumber with ease, but of course, there's a limit to how thick. Handled a 4x4" post without a problem, but 4x6" we had to flip and cut twice. Only thing we've noticed is make sure to tighten the nut that holds the saw blade when you take it out of the box and maybe check up on it occasionally. For some, this is probably a no-brainer, but we neglected to do this and a few months in, found the motor running but the blade spinning at about half speed or less. Tightened the nut, and problem was solved. Very happy with this purchase. Dewalt makes sturdy stuff.
The video “sawstop saved my finger” popped up in my recommended and showed where he only got a little nick bc of this. I was curious bc I had never heard of it so thank you for the great explanation. I’ll have to tell my dad about this.
Exact same situation
Same lmao
Same wtf hahaha
Same lmfao
Same
Genius and certainly a need for it. I hope the inventor makes tons of money
and rightfully so!!!
If the brake cartridge is activated due to skin contact, SawStop will replace the cartridge at no cost to you, so really the only cost to you is a new blade (and the cost of sending the cartridge to SawStop). They have the technology to determine if it was skin contact or something else, like a nail, staple, miter gauge, wet wood, etc.
Yeah the ones that are gonna get bit with a bill are the social media dudes activating it on purpose as a demonstration.
I imagine that voids the repair clause pretty quickly.
I had a shop teacher missing half of his index finger. I once asked him how many years he's been teaching and he said 2 and a half while holding up 2 and a half fingers. One of my favorite teachers, can't even remember his name now
I had one of these saws trigger the brake yesterday in our local makerspace shop. It was almost a non-event. I didn't touch the blade in any manner, but I was working with wet wood. There was no loud noise, and no sparks. The sound was about as loud as that here in this video, and the blade was suddenly... gone.
Amazing how quickly it works.
@working_country ___ I'm not upset at all. I know the tool is safer than a regular table saw, and if we do have an accident, it's not likely to be something involving an amputation. Besides, $200 for a blade cartridge assembly is trivial compared to the cost of microsurgery to attach a digit, and the time off work while it heals. I'd call it a bargain.
Super clear explanation and demo. Thanks so much for that.
This is amazing and so clever, always wondered how this works!
This is absolutely fascinating! My first time ever seeing a video related to woodworking, but I really love what I’m seeing 😊🙌📚
Great and simple explanation, I've always wondered how it works, thank you.
Thank you! Was wondering how it works. Glad i found you!
Fantastic explanation!
I'm in awe... Thanks for explaining
That's a great idea! 👍
So does that mean it will also be triggered if the blade encounters a nail or a staple in a piece of wood?
Most likely not. Strange thing is it depends on how conductive it is. So a thin nail like a brad nail most likely no but I thicker nail probably yes.
I think it would need to be grounded for the current to flow so as long as the nail only touches the wood and the saw it wouldn‘t stop
Disclaimer I know very little about physics
@@Evokans Good estimate, but this is not the case. Sawstop uses a low charge on the saw to detect the finger/hand. The saw realised the difference in charge, and then activated the breaks within 5 milliseconds the saw will stop. The person doesn’t need to be grounded from what I know, as it works with charge just like how static charge works.
Essentially it’s just the charge trying to spread out (like charges repel) and once it has the chance to go to a different body (in this case your body) the charge changes, some being lost to your body.
Going back to the answer about a nail, Sawstop say to turn it off when cutting wet lumber as it will conduct current, tripping the system. It really depends on the time of contact, size and metal.
@@tonyhollerz6958 thx for the reply, sounds like you know your stuff
@@tonyhollerz6958 just for the record, sawstop has ABSOLUTELY no problems cutting wood that is wet or pressure treated....the wood would have to be sooo wet that water would be flying off when you are cutting it, aka a situation you would NEVER be in lol. the wood would essentially have to be actively leaking water as you cut to stop the saw. you seen to act like you know how the sawstop works but you really dont lol.
I purchased a job site saw stop about a year ago. I have sawed wet wood no problems. I have momentarily disabled the safety feature to cut wet wood and then cutting the same wet wood forgot to disable it, but it did not trip the safety device. I accidentally sawed through a metal screw in a piece of reclaimed lumber and did not know it until I examined the off cut which had 1/2 of a screw showing from the cut edge. . I am very satisfied with the ridiculous amount of money it cost.
Very Cool product !!!!!!!!! Thanks for showing this SawStop, Sir !!!!! Also, everybody have a Happy independence Day weekend !!!!!!!!!!!!
Really interesting to see exactly how the system works.
Great video!
What a unique and extremely valuable tool, cool mechanics behind how it works!
Absolutely brilliant 👏
thanks for great explaining everything how sawstop works! now i know how. kudos sir!
What an amazing invention.
Thanks for the video, i always wondered how it worked.
I dont know much about table saws but i know a cool thing when i see one. This is awesome
That is incredible.
Amazing!
Didn't know HOW it worked but now I do.... THANKS!!!!
Greatest invention
Oh I see! So it’s like an extreme version of the touch lamp, but instead of turning off a light, it just turns off the saw!
Yep!
Always was confused how it worked with still running with wood but stopping with your finger
Holy... That acted so fast it sueprised me! What a life saving device.
A lot of people argue that the cost and potential wasted blades aren't worth the money. I'd like those same people to have a conversation with two of my coworkers who lost fingers to tablesaws, one having lasting never damage to their hand.
Secondly, for people who say they can't cut PT wood (including this video), take a look at "Debunking the Sawstop Myth" by Stumpy Nubs. At the 3 minute mark he demonstrates a soaking wet piece of lumber being cut by the saw without it falsely activating.
Long comment short: The extra $1500 is a PITTANCE to pay if it means saving your hand. The cost of surgery, loss of working hours and lifelong disability far exceed that one time investment. And you know what, if you practice safe feeding/cutting methods as you should, you will NEVER lose a single blade to this machine.
YES! Every time someone tries to say they don’t want to keep buying replacement blades or brakes, I always ask them, which is cheaper over $20,000 in hospital bills to fix your fingers (if it is even still possible) or $80 for a new brake? (Likely won’t need to replace the blade) and you get to keep your fingers.
Maybe if you actually pay attention when working with saws you would still have all fingers and dont need to pay thousands of dollars for a baby-proof table saw
Great video. If I didn't see this technology with my own eyes, I would never beleive it.
This is wild!
Ahhhhh I was soooo baffled by this at first… but then I realized, if they were able to connect some type of conductive sensor to the blade, that could be it 🤔
Guess that’s exactly what it is !
…and it’s genius! The device that stays on the blade is the real star … AMAZING INVENTION 👍👍👏👏👏🤘✌️
I love mine!
Thank you.
that is so cool
that is insane!
genius!
I always wondered how these things work so well
Came here from the guy who showed video of him cutting his finger a tiny bit and this saw stop actually worked and saved his finger.
Same xd
thats some crazy speed
Wwoooww! Well that's Soooo Kooool!
i have always wondered how this worked, i had the idea that it could be with a current detection - but not exactly how, and i the full stop, wow. yeah that very cool!
Technology in woodworking has come a long way with safety in mind very nice
still mind blowing how responsive is that fuse.. it seems very sensitive .. I wonder if it can be trigger by just spraying water on the blade
worth every penny
The fact that its soooo fuckin fast is amazing
Some of these are clearly faulty. I bought a SawStop Jobsite saw last summer. Last month, when turning off the saw, I heard a small pop. I thought nothing of it until I attempted to lower the blade before leaving the shop. It wouldn't budge. The cartridge had sprung forward and wedged up against the blade. It did not garb the blade nor did it retract the blade. Of course, it should not have fired in the first place. --I could still use the blade because of the failure but I had to buy a new cartridge and wonder whether the new cartridge would actually work when needed.
I did not and have not contacted them. I was rather sour at the time (as you might imagine) and anticipated (perhaps unfairly) that I would receive no reply or the run-around. I should add that when the saw was first delivered to me, the insert was chipped and the hole through which the axle on one the of the wheels was to pass was too small. I had to file it for 20 minutes before I could get that one wheel on. I wrote to tell them but never heard back. --I like the saw but am bitter over these issues. For 1200+ (a substantial sum for most of us), I would expect better quality control.
Simply genius.
That blade goes down soooo fast!!!
I have always wondered how this works. Very clever.
Not really gonna save you if you fell and your hand slid into it at speed though.
We try to not to stumble around a moving tablesaw. But it still works in more... violent situations. Forgive this old video--from when it first came out: www.woodmagazine.com/video/sawstop-tablesaw-demo
daveytn wrote: Not really gonna save you if you fell and your hand slid into it at speed though.
Don't be so sure. Watch this entire video and see if it changes your mind about that.
How Safe is a Sawstop?
ua-cam.com/video/SYLAi4jwXcs/v-deo.html
its very similar to proximity fuse on artillery shells..
the devices "senses" something by means of electrical currents (which are at speed of light), or radio waves in case of prox. shell (still, same stuff just different wavelength)
amazing invention
Cool
Can you retro fit current saw with blade stop
Dude just imagine you want to cut some Wood that is slightly moisturised and you dont notice it, you are now down 150$
@@Wood
This gives me a evil idea to override it and not tell anyone.
@@SumitSingh-iz9pw please no
@@SumitSingh-iz9pw This is why nobody likes Indians.
@@first_last- yikes dude. It was a bad joke, just calm down
@@Wood good response.
So this guy spent $200 for us to see this. Thank you sir.
Yea. Honestly very informative. My high school wood shop teacher swore by this system as soon as he could he got that. Half a year in he had a student would have otherwise lost at least a finger. Interestingly his deformed more of the pocketed holes, with almost none of the triangle portion collapsed. Interesting to see these intentional failure points and how they work. Some guy with alot more pay than me for sure🤣
Damn, imagine how much it would suck if you were in a zombie movie and had to cut your arm off, but the saw had one of these… 😂
Gracias por el vídeo andaba buscando esto pero no lo encontré en español
Check out Jonathan Katz-Moses video with a super slow motion camera in case somehow you didn’t see that first
That’s blade speed blitzing lawsuits 😂😂
Thank you for wasting a blade and device to show us how it works. Appreciated. ❤
How thick should MDF doors be?
*Question for woodworking experts:* Does it matter what the material is for this to work? Or does basically anything other than wood with no electrical valance trigger it? 🤔
Anything likely to conduct electricity has the potential to trigger the brake.
That is absolutely fascinating 😮🤔📚🙌
He doesnt even trust the saw stopper, so he used the sausage to give an example lmao
The sawstop doesn't make you invincible, it just grants you will get some stitches instead of losing a few fingers
150-200. He said that like it's a lot of money but I'd say this technology is worth way more considering the price of losing a limb.
It would be interesting to see a "standard" feed rate into the blade, not some extra slow feed rate. Might cause a touch more of a "nick" at normal feed speeds.
Adrian Mack
There are videos from a while back when the system was newer that have the demo done at realistic feed rates. A bit more damage to the hot dog, a bandaid or maybe stitch IRL. Better yet is the photos of real life accidents that didn't mean a loss of fingers. Friend lost half a finger last year on a non Saw Stop. As an aside, I really despise the legal action Saw Stop took against Bosch that has effectively halted further development in this technology.
ua-cam.com/video/SYLAi4jwXcs/v-deo.html
Yeah I was thinking the same thing. Still neat technology anyway.
when you cut old wood with a nail in it will it trigger the saw stop when the blade touches the nail?
Probably. For those cuts, you can temporarily defeat the safety system.
@@Wood Your answer is 100% correct, and yet 100% useless.
You would have to know in advance that you're going to cut into a nail. What percentage of people cut into a nail intentionally.
Also, based on how the system works nail may not trigger the brake. Don't recall anything definitively on this. If the wood doesn't conduct electricity to the body, then a nail in the wood may not either.
Someone just lost their finger at my work because they wouldn't install these. Forwarded this video to hr.
Amazing!
See how electricity ⚡️ is part of almost everything around us even organic material!
The real business case for sawstop: making people test it out to sell more cartridges and blades. Second business venture for sawstop: selling hotdogs
If it triggers every time you hit a damp spot in the wood, or the blade hits a nail I could see it getting very expensive. (I know you can't put a price on safety, but you CAN reach a point where you can't afford it)
Saw stop sued Bosh to stop their version. Courts said the mechanics was different enough that was not infringing but somehow detecting an electrical circuit was. Bosh's system didn't ruin blades. This is such a usefull system to protect a huge chunk of workers that the patent system should have found it like the combine. way to usefull to let one entity have a monopoly on it. Or failing that, make it a standards patent that the company is forced to license out.
For it to trigger, the saw needs to detect the minor electrical current in your body. Hitting a nail would only trigger it if you were also touching the nail. I've hit a hidden nail before and the cartridge didn't engage. Slightly damp wood wouldn't likely trigger it either but you can temporarily disable the safety mechanism if in doubt. In all these "hot dog tests", the user is always holding it with their hand. I'm not sure the hot dog by itself would trigger it.
Steve_1401: Although I generally agree with you, I want to add that most woodworkers work in a way that they hit nails extremely rarely. I think this risk is realistic mostly only if they work from scrap pallet wood or something like that. It's pretty unrealistic to cut a work piece after nailing or screwing so if you work from new wood, you won't hit metal parts easily. It's pretty much like airbags in cars: SOMETIMES they get triggered by a minor crash, like hitting a trash bin, and then it's just an unnecessary cost, but after a few decades of experience with them, engineers learned to set the trigger thresholds well so most drivers never ever saw an airbag opening in their whole lifetime, especially not by a false trigger.
Thanks for the info. I've heard of the system but had no idea how it worked. In the video at about 0.59 he says "If you touch the blade with your finger, or with metal, or with anything conductive like wet lumber .......... as soon as that happens it triggers"
I use a lot of reclaimed timber (not pallets), and occasionally I'll clip a screw or staple, even after I think I've covered the entire surface with a wood-wizard. I'll also saw the ends off lumber that's maybe been stored outside before I got it, often those ends will have a very high moisture content.
The saw will not activate if a nail or similar object is cut or in the wood. As for the wet wood, it would have to be so wet that it would be spraying water everywhere during the cut in order to activate it. Also even though they say to change the blade, typically you won’t need to, just the brake.
Science is awesome
Who ever invented this is a genius
So if your wood isn't in top shape it's possible the thing can go off on your own accident even if it's not your finger touching it?
It would have to be wet enough to conduct electricity or contain metal, typically.
These saftey tools are at another level .glad to see . However manufacturers have made them use and throw item to earn lots of money 💰
Thank you I have winder how that works forever
Will this work if i have gloves?
🤯🤯🤯
From what I've seen elsewhere, the blade is not destroyed. It is damaged, but the manufacturers can fix it for less than a new blade - assuming you are using a good high quality blade.
After reading some of the other comments, I am going to do some research into SawStop's legal actions. Protecting one's intellectual property is one thing, but to go so far as to prevent others from developing technology that protects us is going to far.
I wonder how much SawStop would make if they received $100-$150 per machine sold that used their technology.
@@johnslaughter5475 they tried to first license the technology such that EVERY saw manufactured would have this technology. the big tool makers at the time REFUSED to do so because had they installed the sawstop into EVERY one of their saws they offered, they would be essentially admitting that their saws were dangerous before and would open them up to potential lawsuits from users who hurt themselves BEFORE the sawstop blade was offered. you can look it up.
so sawstop had to then manufacture and produce their own brand of saws because they had no choice.
Your feedspeed was way to slow. Noone starts a cut that slow but the mechanism is solid.
Problem with this is, one it may encourage people to become more reckless or careless ie: unsafe! When using such a device. Which could one day, literally bite them. When they have to use a regular table saw without said safety device.(People will do this, not me. Ijs people will break rules. When they know, there will be Lil to no consequences for their actions. If they get "caught") The other problems with this, were already stated in this video. Wet lumber and or foreign debri in the wood. Which would at most cost you a new blade generally. Now costs you $150! (However, Imo! This is a brilliant idea and works amazingly. For its intended purpose. Where would this device be most suitable? A shop class! Or Vocational school that is teaching kids on how to use this tool safely. I would not tell them that they are safe because of the device. In I would probably remove the brand logo. That way they are being taught that the saws are dangerous and it teaches them to be safe on any saw. Vs a saw with such safety device. But if for some reason one student slips up. It won't cost them any fingers!) I truly believe that this is a great thing, I'd just like to see them figure out how to get around wet lumber activating the device. Because it'd suck to have to replace that, when it was no fault of your own and or didn't activate for your safety. I'm betting it can be done!
You're probably right, Richard. We were so glad when they put airbags in cars so would could finally drive recklessly all the time. (BTW, you can temporarily override the braking system for wet/debris-prone wood.)
Let's give a high four to the guy who invented it
Cam be like:does that actually work?lets find out!
Meet the guy who invited this and have him a high four!
I wonder who was the first one to try their finger?
@@Wood Yes intentionally. You couldn't pay me enough to try it:)
@@SpitSharp I believe the creator has there’s a video on it
@@r0bert852 Someone had to try in I'm sure otherwise man couldn't sleep until it's conquered:) Peace to you not pieces:)
Lets see how horror movies are gonna do their kills now
Oh it’s detecting moisture through electrical pulses carried through the blades surface, that’s how it works. Let me ask the obvious question: what if I need to rip treated sheet or lumber? Do you just turn off the safety mechanism?
May be able to wear nonconducting gloves instead of turning off safety mechanism. So could still have finger protection. Have not proven this out and this is not a recommendation. Just a thought based on my limited understanding of out the system works.
Is there a reason the system can’t just drop the blade, cut power to the motor, and activate the motor brake instead of dropping the blade while forcing a piece of metal into the blade?
That could certainly be done.
Think BOSCH had a system that did this. Think it was called Reaax. But patent lawsuit put a stop to it.
Question is though, can the blade be dropped below the table faster than it can be stopped?
By my rough calculations the blade is stopped in about 1/3 revolution from time of detection. Less than 5 milliseconds (five one thousandths of a second). I'm skeptical that the blade can be dropped below the table that fast.
I thought the blood from your finger completes the circuit that retracts the blade.
So u can't cut treated lumber with it
Damn 200 dollars for finger insurance? That’s genuinely a sweet deal.
It's not really insurance. It would be more akin to being able to buy auto accident PREVENTION. Insurance doesn't replace body parts.
What if you force your hand fast into the saw?
Very old video, but demonstrates this. www.woodmagazine.com/video/sawstop-tablesaw-demo
What if I want to cut metals
You can override the safety mechanism on an individual cut basis.
@@Wood May also be able to wear nonconductive gloves. If glove is breached and finger contacts blade the brake should still be triggered. This may be safer than overriding the safety mechanism. I have not tested this, and this is not a recommendation. Just a thought based on my limited understanding of how the system works.
I wish we had these in 1996 when I decided to write my name across my fingers in scar tissue. Still can’t read it.