this post was submitted on 31 Mar 2024
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Now I'd like to know how a saw blade could actually run away like that?
I can imagine a lose saw blade rolling down a hill, but it probably won't gain that much speed. And within a saw, it is mounted on an axis and surrounded by a lot of other stuff, so even if the nut comes lose on the axis, it won't be going anywhere much, at least not while taking that much rotational energy.
The blade got spun up, then came off the saw, likely because the retaining nut came off. The blades aren't on some long mandrel, they're on a short bump of a shaft that the nut screws down to. Take a look at how discs connect to angle grinders and you'll have a good idea of how concrete saws do it
It is perplexing, because those usually have a guard over them aswell. Maybe the shaft stud snapped right at the blade, and machine had the blade without guard rotated down over it?