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Reply by crank49

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Posted on An alternative to Saw Stop?

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crank49

3434 posts in 1627 days


#1 posted 01-23-2013 01:52 AM

I don’t think some folks realize how fast the SS stops the blade.

I already pointed out that the blade surface is moving at close to 200 feet per second. That’s 136 MPH, by the way.
When the brake (and please stop spelling this break) engages the blade, its circumference moves less than 3/8 inch in a circular path before it is below the table.

If you had a brake that would stop the blade in 1 millisecond, 1/1000 of a second, the blade would travel 2.4 inches in a circular path. That’s about 6 teeth on an 80 tooth blade.

It would take hundreds of times more power to stop the motor than it does to stop the blade alone. Also, consider the fact that the blade motion has to stop virtually instantly what ever is doing the stoping. So, to stop the motor that fast I am pretty sure the motor would be destroyed the same as the blade.

I still think the best alternate for stopping/retracting the blade would be a clutch to release the motor and use the considerable energy of the still spinning motor to snatch the blade below the table while disk brake calipers grab the blade. But this will be more expensive than SS and will not work as well.

I will say that a slider or a power feeder that would keep your hands completely away from the blade is just as good of an approach as the SawStop.

And, a completely different type of saw might be designed to displace the table saw all together. Perhaps a band saw with a wide blade could be as good at through cuts. Still need something for non-through cuts, however.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H


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