Why do rip blades rip faster?

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The explanation for that is that the cross-cut teeth are the wrong shape for ripping! A hand saw shows this most clearly, and a Swiss army knife best of all. Crosscut blades are sharpened as opposed pairs of knives to cut each fibre at each side of the kerf. A rip blade is a single chisel edge to lift the fibre away from its neighbour. You'll notice that it's possibel to rip with a cross-cut saw, trying to cross- cut with a rip saw is very much harder work.
For most small circular blades there's little difference. They use carbide inserts and are fairly sharp on every edge. The problem with this much power in this little space is clearing the chips, not making them. Look at an old non-carbide circular balde, or a really big rip blade and you'll see the same hand saw tooth shapes re-appearing.
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