Thread: New blade brake invention to compete with SawStop

I much prefer this system! It can be attached to existing TS's, it doesn't damage the blade or the motor & activates before your hand can touch the blade. If the price is right when it hits the market i'd happily purchase 1 for home.

Very interesting.

Hi All,
Great find Jill.
Seems like not only do you save your Fingers, but you save your Blade as well.
The other Saw Stop is great also, but you lose your blade.

It never ceases to amase me how the human brain can look at a situation and come up with an alternative as good or better than the original
My thoughts on this slant of the saw stop is that if you activate the stop you only have to turn the saw back on and your away. There is no need for new spare parts down time (and expense!). We all know that stuff happens which could activate either system but this system I think gives you a little more leniency with operator/operation.
A retro fit to existing machines I think would be a simple and cheaper alternative.
The original Saw Stop idea is a great example of safety in action. But I don't think we should be forced by government decree to have it on every new bench saw regardless of our preferences.

Agreed it's a good thing but I would like to understand how it operates. It seems to me that bringing everything i.e armature, gears and blade to an almost instant halt has to place enormous stress on all those parts



Ian

Not as great as the stress on your finger though when a blade goes through it...

Yowie - you might like to take a wander through this forum and take a look at the s##t fight that surrounded the Saw Stop. I would not like this discussion to go down a similar path. Of course even Blind Freddy can see it would be much better to replace a saw than a finger (or two)

All I was highlighting was the fact that the inventor claimed to be able to retro fit it to any (or most) saw tables and that the saw was re-usable immediately after trigggering the mechanism. I'm not sure if all the machines out there would be up to the stresses involved.


Ian

Originally Posted by Rattrap

I much prefer this system! It can be attached to existing TS's, it doesn't damage the blade or the motor & activates before your hand can touch the blade. If the price is right when it hits the market i'd happily purchase 1 for home.

at the risk of starting another "vibrant" discussion and with no intent of dishing the inventor, some numbers for people's consideration:
taking Carbatech's popular TSC-10HB saw as an example

the blade spins at 2850 rpm -- for the 250mm blade that's a cutting speed of around 2240 m/min or 37.3 m/sec. So in 1/8 of a second, the blade travels around 4.7m or about 6 revolutions.
(BTW 37.3 m/sec is equivalent to 134km/h)
to give some indication of the speed of mopvement, "standard" walking speed is 1.2m/sec, so in 1/8 second a person walking would travel around 15cm AND because your arms naturally swing in time with your walking pace, starting in front of you and ending behind you, your hands would travel a bit more than that, say 20cm.

Now how fast would you feed a piece of wood into a ripping blade?
It would depend on it's hardness and thickness, but that should not be the consideration.
The more likely risk scenario (for amputation) might be reaching towards the blade to clear an offcut. How fast would your hand be moving then? How far away from the blade does the trigger need to be?
and if it requires that you always use the guard, would you need it at all or would "common sense" be enough?

Very good point Ian. To be honest i really hate those types of guards, they always get in the way when using push sticks & also tend to block view of the blade as it bites into the timber. There is no way i could ever use my 'Grr-ripper' with a guard like that in place.
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So the question to myself is, which is safer, the Grr-ripper which puts itself completely between myself & the blade or an exposed blade under a well lit guard with flesh sensing shutoff technology??
I'd be interested to hear peoples opinions on this subject.

This is very interesting. Would like to find out more and most people would agree that keeping original fingers is a good thing.

This subject should be considered in with the posting under "Table Saw & Combination" the thread - "For those that missed" this posted by and the various members that contributed to that posting .
Mac

It looks very interesting, but like stated, it allso blocks you view. I personally do not like gaurds over my blade. Yes a very unsafe practice and dangerous beyond belief, but I detest things that block my view of what I am doing. I would like someone to provide safety without compromising my view. Just my opinion folks.

Originally Posted by ian

It would depend on it's hardness and thickness, but that should not be the consideration.
The more likely risk scenario (for amputation) might be reaching towards the blade to clear an offcut. How fast would your hand be moving then? How far away from the blade does the trigger need to be?

Another type of incident is the "slip", for whatever reason during a cut there is a twist or slip or both. That's why I think we need to see a" flicked pig knuckle test".

Originally Posted by cookie48

. . . . . , I detest things that block my view of what I am doing.

That's why I adapted standard dust picker arm with an easily movable, large transparent polycarbonate guard that has much better view and DC than any other guard I have seen.

The guard is connected via pulleys and a stainless steel cable to a counterweight so that the guard can can be easily moved and it stays where it is put, although I admit that most of the time it is well out of the way. In my new shed arrangement the TS will be in the middle of teh shed so the dust picker arm will have to attach to the ceiling.

The guard is connected via pulleys and a stainless steel cable to a counterweight so that the guard can can be easily moved and it stays where it is put, although I admit that most of the time it is well out of the way. In my new shed arrangement the TS will be in the middle of teh shed so the dust picker arm will have to attach to the ceiling.[/QUOTE]
Bobl.
Good idea. Will look at that idea. Thanks for showing it.
Cookie
P.S. I find that by blocking my view I feel most types of covers are more dangerous than not. Again just my opinion