Its called “SawStop” and it stops the blade in 5 milliseconds.
Also drops the blade beneath the table surface.
Destroys the blade, so your cost is the blade and the brake cartridge.
Beats the cost of having a finger sewn back on by several thousand dollar.
The technology was originally offered to Rockwell Delta for their Unisaw, but they refused because they though it indicated their saw was unsafe.
Their thinking was that by having a brake on the blade people would think the saw too dangerous to use…like any tool, used incorrectly it is dangerous.
And any woodworker will tell you this…“it isn’t a matter of if I cut myself, but only a matter of when”.
Sawstop now manufactures the entire saw themselves, and it sells quite well.
The reason I bring it up is this.
Last year, a “armature” inexperienced wood worker sued Ryobi because he managed to cut off a fore finger and mangle his thumb badly.
His contention was that, because the technology to prevent his accident was out there in the form of the SawStop, Ryobi had a duty to install this technology or one like it on their saws, and had they done so, his accident would have been prevented.
Fact of the case are pretty simply.
His had never used a table saw before, he hired out as a sub contractor installing wood flooring.
His employer showed him how to use the saw, the miter gauge, the rip fence and in his words, “trained me” for a day or so before letting him work solo.
The saw was a small, table top portable version.
The man needed a small section of flooring ripped to width, so, with the saw on the floor at a bad height to use and with out the rip fence in place, and with the blade raised all the way to its full height, he tried to freehand rip a piece of oak flooring.
The wood bound up, he tried to force it through the blade, slipped and shoved his hand into the blade.
Any wood worker with any experience will shudder at the