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Reply by crank49

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Posted on An alternative to Saw Stop?

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crank49

3337 posts in 1569 days


#1 posted 549 days ago

The Saw Stop patent would not stop you from making some other brake or drop and release method, but the SS method is absolutely the best one possible. Anything else will be second best.

I say that, not because I own one (I do not) or have any association with SS what so ever, just an observation of an engineer with 42 years of experience coming up with “outside the box” solutions to problems.

There are 2 main things about SS that make this design the best.
1- The brake cartridge stop block jams into the blade and stops it instantly. So fast that the motor and belts and even the arbor continue to rotate for a few milliseconds. It’s much harder to stop the mass of the motor than the relatively light blade in comparison.
2- The stop block jams into the back side of the blade so, due to the direction of rotation, the blade snatches itself below the table. There are no other energy sources needed because the blade rotation is directly converted into vertical movement in one direction (down).

These elements are what is protected by the patent because they are the essence of the design and the idea that created Saw Stop in the first place. This is what patents are for.

The flesh sensing technology is not unique. The touch screen on smart phones is similar technology.

If I were going to develop an alternate solution I would still grab the blade. There is no other way to stop something moving at ~200 feet per second, which is the tip speed of the teeth on a 10” blade spinning at 4500 RPM. But you would have to grab the sides of the blade, like a disk brake rotor to avoid the Saw Stop patent. Further, this brake caliper type devise would have to have some energy source.

Then I think a drive with a clutch that could disengage from the motor and engage a gear or cable to pull the blade below the table at the same time might be possible without infringing the patent.

Finally, even if this system could be made to work and not get into a patent piss fight with Saw Stop, it would surely cost more to produce and would not work quite as well. Not a system likely to be a market success.

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


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