THE WORLD’S SAFEST TABLE SAW This table saw will shut off in a split second leaving you with all your fingers.

​1. Monitor & Detect
The blade carries a small electrical signal.
When skin contacts the blade, the signal changes because the human body is conductive.
The change to the signal activates the safety system.
​2. Brake Activation
An aluminum brake springs into the spinning blade, stopping it.
The blade’s angular momentum drives it beneath the table, removing the risk of subsequent contact.
Power to the motor is shut off.
All this happens in less than 5 milliseconds!

​3. Reset
Resetting the saw yourself is easy. Simply replace the blade and affordable brake cartridge and your saw is operational. The entire reset process takes less than five minutes.

SawStop’s saws apply a small amount of electric voltage to the blade of the saw. The current through the blade is continuously monitored. If the saw detects a change in this current (as would occur if a hand or other body part came into contact with the blade) an automatic braking system is activated, forcing an aluminum brake block into the blade. The saw stops within five milliseconds, and angular momentum lowers the blade into the table. The operator suffers a small nick instead of an amputation or other more serious injury. The design takes advantage of the difference in “electrical conductivity” (similar to a GFI circuit) between wood and flesh.

According to SawStop, there are restrictions and limitations:

The braking system must be deactivated when cutting very green or wet timber.
Non-conductive blades or blades with non-conductive hubs or teeth cannot be used.
The braking system is designed to work with kerfs from 3/32″ to 3/16″; using thinner or thicker kerfs limits the saw’s ability to stop the blade after accidental contact, likely resulting in more serious injury.
It is impractical to retrofit into existing table saws.
Activating the braking system often damages one to two teeth on the blade.