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Normal grinding wheels are made from abrasive grit bonded together in a vitrified medium, so they're like a ceramic. This makes them hard and durable, but very brittle, and even the smallest defect can lead to catastrophic breakage which of course takes place at high rotational speeds, throwing the pieces off at very high velocities1. One of the functions of ...


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It sounds like you're running your bit too slowly. Spade bits are pretty sensitive to low speeds. A faster speed (and less feed pressure) will result in less material being removed with each pass. This, in turn leads to less force on the wood, resulting in less tearing of the fibers. This tearing of the fibers, instead of cleanly cutting them, is what ...


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