We have had finger saves where users slapped their hand down onto the blade, where their glove was caught and jerked their hand into the blade and many other. In each case, the system has worked as intended and the user came away with a relatively minor injury. Do you get fan mail from people whose fingers were saved?
He sent a simple sketch where he had drawn the outline of his hand missing fingers and he described the lifelong consequences. It was one of the most moving things I have ever received. Related Articles. Particularly when carrying out drilling and sawing work, the forces between the workpiece and the machine can suddenly increase, potentially with serious consequences for the tradesperson.
In an interview, lead developer Markus Schmid looks in detail at how this technology works in these types of machines. Read more. A motor is the core component of any power tool. But a good motor isn't everything: It is dependent on perfect interaction between the battery and the motor, which is especially the case for cordless power tools.
Developers Fabian Grass and Martin Graf tell us in an interview how important this teamwork between the battery and electric motor is for day-to-day work on the construction site. I wondered if one could stop the blade fast enough if you ran your hand into it to prevent serious injury. Once the question came up, I thought, well, how fast would I have to stop the blade? So that's how it started. My sense was it was just very dangerous, and I knew people that had lost fingers.
My first accident in a shop was on a jointer when I was about four years old, so I started early. Nonetheless the table saw seemed like the logical choice. After the table saw, I thought I could do it on a lot of different tools. The key to the technology was the actuator that triggered the brake.
The blade is spinning at RPM, that brake has to trigger on the order of a millisecond. The force required to do that is incredible because the T time component is so small. I started puttering around on how to stop things quickly. The simplest would have been a solenoid, but that would have been too slow and weak. I had come from RC airplanes—so I used the nose landing gear torsion spring from an RC airplane for an early experiment, that spring provided the force and I held it back with a fuse wire, a maybe 10 thou diameter fuse wire.
I set up some capacitors to discharge through the wire and melt it in a few milliseconds, and I was able to generate maybe 20 lbs of force against a blade. This concept ended up being very similar to what we did in the production table saw. When did you decide on using the famous hotdog demo? Was there a predecessor? What was the first thing? It was probably a stationary blade with me just touching it with my finger. Sure enough, it worked. There was a point where we had to know a hotdog was a good surrogate for a finger.
So before the first trade show I had to test it with my actual finger. Thankfully it worked! Yea, the braking action is very powerful.
Like popping a balloon with your face. The hot dog is an extension of your body. We had dealers do this in front of customers and call us in a panic on why our system didn't work. What was that like? It was sort of futile. We should have started building our own saw from the beginning. I remember being on the phone with four different lawyers when speaking to Bosch, and we went back and calculated the cost of the call—it came out to about a dollar a second.
The fundamental question came down to economics. They will prevent the SawStop safety system from applying the electrical signal on the blade that is required to sense skin contact.
Built from their solution-based approach to goods, the company has finally discussed the need for a fully compact full-power job site bench. The following seven sorts cover a range of DIY scenarios, from wood to metal. Traditional Handsaw: A typical handsaw with a retractable blade and a strong handle. Choose the sort of conventional handsaw you need depending on the cut and the TPI you need to produce.
Describing conditions so generically that everyone thinks they have it. Funding studies with questionable methodologies that indicate correlation, but rarely causality. Releasing study results through clueless media outlets prone to taking them at face value. Drugs are easier than exercise. No one really wants or can remember to bring a reusable straw on the go, but you can easily keep a few in your home or office and ask for no straws at restaurants or coffee shops.
Jan, my story is so similar to yours. I have been an avid woodworker for nearly 50 years. Last Friday morning I had my wife drive me to ER to stitch my thumb back together.
All I know is it happened in the blink of an eye and there is no return to normal. I am choosing to replace my tablesaw with a SawStop model. If the technology is available and I can offer myself and my family the peace of mind while continuing to follow over 50years of accident free safety habits, I should be in good shape to continue to do what I absolutely love.
My Aunt Sandy lost half of one of her index fingers and the tips of the adjacent middle finger and thumb. Magically they ended up in the path of the blade? Sounds like complacency. Really dumb comment, Chris. Accidents happen, even to the most skilled, most careful people. Probably even to you. Like it or not, these inexpensive saws are hugely popular with homeowners, DIYers, and even pros. Safety precautions and proper operating protocol are neglected in the demos, probably intentionally, for the sake of prompting a stronger emotional response.
Did Volvo require other car makers to license their 3-point seat belt design? No, they offered the technology for free because they felt the improved safety measures should benefit all. I saw one of these in Woodcraft last night. I asked the guy working there if he or anyone there had been brave enough to test it out. He looked at me as if he was done talking to me for good.
Are there documented accidents where they show the outcome of Saw Stop vs. The inventor uses his finger instead of the hot dog in this clip. I still wonder how it would do if your hand was thrown into the blade, not just lightly touching it.
Put his hand where our money is. They do show them slamming hot dogs into the blade at speed and the hot dog just gets nicked. He could probably wrap a piece of bacon around a digit times and it would provide protection against the scratch.
Many many many woodworkers have lost digits in accidents that no way resemble the SawStop demos. In the Colbert piece, the guy was reaching over the blade. Fingers can get sucked into blades for added damage. I was looking at getting a saw stop.
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