this post was submitted on 31 Mar 2024
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[–] [email protected] 4 points 7 months ago (2 children)

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.

[–] [email protected] 4 points 7 months ago* (last edited 7 months ago)

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

[–] [email protected] 1 points 7 months ago

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?