How does a blade spot the difference between wood and a finger? I am puzzled … And seeing the stop; the saw died afterwards. Well, I prefer my 10 fingers to a saw 🙂
Translated from the article which I put the link in my previous com.
“SawStop saws apply a small amount of electrical voltage to the saw blade. Someone continuously monitored the current through the blade.
If the saw detects a change in this current (as would occur if one hand or another part of the body is in contact with the blade), an automatic braking system is activated, forcing an aluminum brake block into the blade.
The aluminum block absorbs the energy of the blade by deforming.
The saw stops in five milliseconds, and the angular momentum retracts the blade into the table. The operator suffers a small nick instead of an amputation or other more serious injuries.
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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:
Someone should deactivate the brake system when cutting very green or wet wood.
Non-conductive blades or blades with non-conductive hubs or teeth cannot be used.
The brake system works with kerfs from 3 to 32 “to 3/16”.
Using thinner or thicker limlet limits the ability of the saw to stop the blade after accidental contact, possibly resulting in more serious injury.
It is impractical to rearrange into existing Best Table Saw For Beginners.
Activation of the brake system damages the blade.