It is not always easy to identify a broken scroll saw blade, but there are some telltale signs. If you notice that your scroll saw is making a strange noise, or if it is not cutting through the wood as easily as it used to, then it is likely that you have a broken blade. Another indication of a broken blade is if the wood starts smoking or catches on fire. If you are unsure whether your scroll saw blade is broken, it is best to err on the side of caution and replace it. Trying to fix a broken blade can be dangerous, and it is not always successful.