How do you folks tell if a bit is getting dull?
It no longer cuts well.
Some folks keep a detailed usage log.
Other folks will use a loupe to inspect tooling before each usage.
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I usually can tell by the cut itself in hardwood.
more dust than chips, and dust is hot: bit is dull. I found a wireless miroscope in my stuff, and use it to check the blades. And: I have a local bit sharpener (and -manufacturer), the best: Dinosaw in Hudson, NY.