- 5 Oct 2014
- Reaction score
- Sunny Glasgow
I'd question as to in what capacity that 'demonstration' was being made.I watched a video of someone demonstrating dropping on to a spinning sawblade and lifting off with neither a back or forward stop, so in that case those 'always present' stops were absent. Demonstrating is one element of teaching, and those that watch to learn often try to replicate the actions of the demonstrator. In my case demonstrating to learners has always been in my teaching arsenal. Slainte.
But either way can we examine the mechanics of laying on.
The action of the blade is driving forward, in that anything in contact is being pushed backward. You agree ?
So from a safety point of view, it is hand pressure only keeping the movement from flying back, in a kickback scenario
That action alone would have the HSE sweating. There is no way on gods earth they would allow that action to take place in a teaching environment. Given the actions of what happens in an accident are what is being examined by HSE in a logical manner. They aren't just guessing, they're looking at it and the mechanics of long understood scenarios from their decades of experience.
In the vid, he is laying on, and the action of pressure from his hands are inward towards the fence, in line with the blade, and also holding it stationary to prevent it from moving backward beyond the point of the intended cut. Agree ?.
In effect the operator is using his right hand as an improvised back stop,but one that can move, so not really effective should he mis-align or the saw catch and try to kick out the component.
I would say that isnt a safe way, but if we replaced the right hand with a backstop, the action would effectively be the same. Dropping the component onto a moving and unguarded blade.
But thats not the dangerous part. The dangerous part is lifting it off. At this point it is at risk of snatching it as you need release inward pressure and at the same time lift the leading edge of the component, which risks coming into contact with the back and upward direction of the blade, which facilitates a kickback.
In my humble opinion, the choice of using a saw to make this cut is the wrong one, and it should probably be made on a spindlemoulder, using a slitting saw(or wobble saw) thats coming through a zero clearance fence(as in a sub fence of say 6mm ply and its been broken through)
Failing a moulder, then a router table with the same set up, or failing that a router and jig. But onto a saw no way.
30,000 saw bench injuries each year in the US, of which 4000 involved amputations.
OK the operator in this might be Canadian, but the statistics given lack of hse incentives is the same and will be proportional, in that its going to be a hell of a lot.
It's actually hard to find the data for Canada and the UK, but I'l hazard a guess out of all three the UK scores best with fewer accidents per head etc etc.