Clever Safety Device-Amazing!

[mitt]

Side note- according to an article I read recently the two most dangerous tools statistically are the razor knife and the ladder. Go figure.

I believe that.  We can't use locking utility knifes anymore at work, they have to be self retracting.  The self retracting are far more dangerous in my opinion because they make the cutting work so much harder to do.

mitt

[DesmoDiva]

There are two of those in the wood shop at school.

The stopping devices have had to be replaced a couple times.  ie. saved a couple of over tired, architecture students fingers.

Once it tripped for a nail in a piece of scrap.

IIRC, it is a few hundred dollars to replace the brake.  Not cheap, but cheaper than a lawsuit or losing a finger.

Mitt, there is no ground tether.

[mitt]

Mitt, there is no ground tether.

Hmm, I will have to do some research to know how it can sense a change in resistance between wood and a well isolated mammal wearing boot quality work boots. 

mitt

[DesmoDiva]

It was explained to me that it detects an electromagnetic change in material, not necessarily resistance.

[Buckethead]

Hmm, I will have to do some research to know how it can sense a change in resistance between wood and a well isolated mammal wearing boot quality work boots. 

mitt

Humans make good capacitors. 

[mitt]

I did a little reading on their website, and I think I understand what is happening.  It uses the body's natural capacitance to create a dip in a weak voltage that is applied to the blade and sampled at a high frequency.

Not the body's resistance that would cause a current leak like I originally thought.  That would take too high a voltage to drive the leak and could be over ridden by someone wearing electrical safety shoes.

I am still very impressed at the system from both a mechanical and electronic standpoint.

mitt

[Buckethead]

Haha!

32 seconds.

[mitt]

Haha!

32 seconds.

even less, because by the time I had typed and hit post, I got a warning, someone else had posted message, so really more like 20 


mitt

[brimo]

Capacitive switch.

http://en.wikipedia.org/wiki/Touch_switch

[He Man]

assume you had a hammer that mimic the properties of human flesh so that this device triggers.

also assume the device is reloadable instantly.

Inamgine playing wackamole with this thing.

[Speeddog]

~SNIP~

IIRC, it is a few hundred dollars to replace the brake.  Not cheap, but cheaper than a lawsuit or losing a finger.

~SNIP~

I spent ~$400 at an Urgent Care to get 4 stitches on a lacerated knuckle.
(Work on motorcycles for a living and I get wounded washing a glass  )
I don't think you can get to a bed in an ER for a few hundred, let alone get any treatment.

I'm pretty sure that fingers that are cut off with a rotary saw aren't easily reattached.
Perhaps someone here knows...

[hihhs]

~SNIP~
I'm pretty sure that fingers that are cut off with a rotary saw aren't easily reattached.
Perhaps someone here knows...
~SNIP~

The guy that was injured on my job-site(previous post) had one of three fingers successfully reattached & has very limited use of the of "saved" finger. Not to get too graphic but the saw blade destroyed the fingers. It was not a "clean cut".

[erkishhorde]

I taught the shop class for the first year college of Architecture students for a few quarters while doing my master's classes. Got to talk with the shop manager a lot. I'll echo DD on saying that it's a few hundred dollars and not $60 like what the video says. It works great though. It often gets set off by soggy wood and nails and pisses the hell out of the shop manager. I think it's only actually been set off by a finger like twice in the last 5 years. But if you think about it, it's like insurance. You pay for the false alarms all the time like paying a premium for insurance and then when the real deal comes you don't get your ass sued off by some angry parents.

Even though these kids are taught the right way to use the equipment, most of them are still afraid of it and will do stupid shit. And as said before, even a pro gets a little careless when doing repetitive work.

[Speeddog]

That was what I recalled from a real ER TV episode.

They showed the X-rays of some fingers that got Skilsawed.  

[Grampa]

fyi.... a severed finger will get ya like a grand from AFLAC 


thats like a free Termi slip on system