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I can understand why some people leave dull blades in their bandsaws. If you are uncertain on how to install and tension a new blade, it can be a bit daunting to re-set all the guides, bearings and other setting on a bandsaw, but after you have done it a few times, and you understand the process, it's really not a hard thing to do.
The reason it is so important to know how to change bandsaw blades is because they do become dull quite readily owing to the fact that most of them are made or steel because they need to flex around the bandsaw wheels. Most bandsaw blades for smaller saws, 10, 12 & 14 inch are pure steel blades. These blades heat up during use and over time become dull, and as they become dull, we push harder on the wood, making them even duller and eventually they need to be changed.
The most important step in changing bandsaw blades is to unplug the power to the bandsaw. Some saws have switches in weird and wonderful places that can easily be flipped on by accident when working on the saws. Next the blade tension needs to be released so that the blades is quite loose. At this point you can open the wheel doors to look inside ...