While doing that also look for your "push solenoid". They are available but limited in what they can move and the force they can make. You will find most solenoids are of the pull variety.

Hi- thanks, the movement required is only a couple of mm, so can use a lever arm to multiply the force. So can use push or pull. Have found one with a 5N force and 10mm stroke that will do the job. I only need a single stroke, so the lever can also operate a microswitch to de-energise the solenoid when if done it's job. The safety device is re-armed when the machine is re-started (after fixing the fault).

 

The most amazing mechanism I've seen for this is a table saw brake that stops the blade instantly when it comes in contact with human flesh, so fast that no damage whatsoever is done.
I've seen a video where they push a hot dog into the running blade and it stops without breaking the skin of the dog.
Would save a lot of missing digits that some table saw users seem to have.

If nobody loses a digit, you wouldn't be able to tell which adults in the school were Shop teachers.

Also, the Stop Saw uses a charge to blow an aluminum block into the blade - $80 each time you save a finger.
https://www.sawstopstore.com/produc...lades-blue-tsbc-10r3-equivalent-to-tsbc-10r2/

 

Tablesaws cut the fingers off even very careful users. There are many examples where accidents outside the control of the user leads to amputations. Tha Sawstop is a great piece of technology, and it saves limbs. It should be standard.

I use a tablesaw, and my current one is not a Sawstop but when I renovate my shop the new one will be. It’s just a statistical thing about which of us loses a finger. Accidents, real ones that don’t have to do with negligence, do happen and things like Sawstop prevent catastrophes.

It is not a free ride, and if you do manage to activate it you have to shell out (last I knew) about 60 bucks for a new brake which is sacrificial and possibly a new blade which might cost as much.

Just came across this, worth watching: