It's basically a chainsaw cutter attached to a circular blade. It will work for rough cuts. I see no reason for it to be unsafe. I also don't see a purpose for it that isn't already offered by blade designs that we already have available to us. It also has a larger kerf than blades we currently use, so your yield will be less per board.
I bought a blade like that at a local lawnmower shop. It was called a beaver blade and was made to go on the end of a straight shaft weed trimmer. They came in a 6 inch and 8 inch size. Do they have any markings on them?
I'm thinking it looks like a brush cutter blade for a weed wacker type machine. Those usually have an odd size arbor that doesn't fit consumer type saws. :smile:
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