SawStop. They say it’s the world’s safest table saw. Apparently there’s 60,000 table saw related injuries every year in the US alone. One every 9 minutes. Youch! This puppy puts an end to the serious injuries because it stops the blade within 1/200th of a second and retracts it out of harm’s way. Pretty cool tech all round, and if’n you don’t believe take a look at the hot-dog demo video.
The SawStop safety system includes an electronic detection system that detects when a person contacts the blade. The system induces an electrical signal onto the blade and then monitors that signal for changes. The human body has a relatively large inherent electrical capacitance and conductivity which cause the signal to drop when a person contacts the blade. Wood has a relatively small inherent capacitance and conductivity and does not cause the signal to drop.