This is neat. This copmany has developed technology for tablesaws to
prevent people from losing fingers and hands to the blade. The thing has a
microprocessor that detects when the electrical impedence changes in the
sawblade (from a finger or other human skin touching it) and it uses an
emergency braking mechanism to stop the blade so quickly that it prevents
more than a 1/8" deep cut.
The braking mechanism ends up shredding the blade, but the saw is unharmed.
It costs about $80 to reset the saw back to a ready and safe state. All in
all, $80 is a heck of a lot less than a workman's compensation claim.
The videos are cool - they demonstrate with a hotdog.