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Originally Posted by sanddrag
The funny thing is, I've ground steel as hard as I could to make the most sparks possible to try to light a propane torch and absolutely nothing happened. It didn't even light.
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I've set a few things on fire when grinding steel at my home shop over the past decade...like a box of tissues on the workbench, and dry grass outside.
There is a real fire danger, but that is not the only danger, the sparks do cause pain when they contact exposed flesh.