SawStop Brake Activation


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I was crosscutting a 1/2 inch piece of Baltic Birch plywood on my SawStop contractor saw last weekend when my brake went off.  No part of me was near the blade, and the only irregular thing was that I was cutting a 45 degree bevel for a box.   As expected, the blade was ruined. 

I emailed SawStop to figure out what happened, and got this response:

Quote

Hello,

The brake has a memory chip inside that will shed a lot of light on exactly what caused the brake to activate.

We will send another email with info to get that brake back to us, and get some answers.

 

Who knew?  Big Brother exists.  

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I don't know if they still do, but if the activation was from a flesh strike, which your's isn't, SawStop would replace the brake for free in exchange for the spent one so they could analyze activation of the brake.

Remember it isn't just flesh, it can be metal, high moisture in the wood, anything conductive that comes in contact with the blade.

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Betcha it's a holdover from their R&D days.  I would bet while developing the tech, they had a few misfires (for the reasons listed above), and they needed to trouble shoot the issue.  So they probably added a chip that can store to EEPROM and it would store the voltages or what nots that trigger the brake.  They probably have a list of various what nots that represent different conditions, flesh gives one reading, metal another, etc etc.    /idle random thoughts

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I used to belong to a club shop that also sold SawStop. I will say that the chip in the break is marketed as a feature. Probably the most common question people have concerns break activation and conditions for misfires. The folks at the shop would tell people that SawStop could figure out how breaks fire through that chip and the machine was smart enough to know the different ways a break could fire. 

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8 minutes ago, lewisc said:

Is the brake going off a changing pants moment or do you stand there for a while wondering what just happened?

Very anticlimactic.  There's a clunk and the blade is gone.  If you wear ear protection you won't really even hear it.

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5 minutes ago, lewisc said:

Is the brake going off a changing pants moment or do you stand there for a while wondering what just happened?

It was a typical "something happened, check for blood and missing digits" moment.  I was pushing the plywood through the cut, there was a loud bang and the saw stopped, and I was looking around to see what happened.    I was a little perplexed because all went suddenly silent, except for the dust collector.  

 

I am pleased that the saw worked as intended.  As for the force of the brake, I had to use a hammer to beat the brake off the blade.  It tore a tooth off the blade in the process.  

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I was crosscutting a 1/2 inch piece of Baltic Birch plywood on my SawStop contractor saw last weekend when my brake went off.  No part of me was near the blade, and the only irregular thing was that I was cutting a 45 degree bevel for a box.   As expected, the blade was ruined. 

 

I emailed SawStop to figure out what happened, and got this response:

 

 

Hello,

 

The brake has a memory chip inside that will shed a lot of light on exactly what caused the brake to activate.

 

We will send another email with info to get that brake back to us, and get some answers.

 

 

 

 

 

 

 

 

I activated my brake while using an Osborne fence after I swapped it over to the opposite miter slot. I didn't move the fence over sufficiently, so totally my fault.

 

 

I sold the fence.

 

 

You said you were cross-cutting at a bevel. Were you using a metal miter fence? Is so, you may have inadvertently tilted the blade into fence if you were cutting in the left slot.

 

 

 

 

 

______________________________________

 

Sent from my iPhone using Tapatalk

 

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On 8/4/2017 at 8:37 PM, gee-dub said:

Very anticlimactic.  There's a clunk and the blade is gone.  If you wear ear protection you won't really even hear it.

Ya, I hardly heard the clunk. The blade just disappeared & it took me a second to realize the brake had tripped.

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