Question about a weird noise from my miter saw that led to a big mistake

I was cutting some trim for a kitchen in a house in Tacoma and my saw started making a high pitched hum I'd never heard before. I kept going and it turned out the blade was on backwards for the last two days of cuts, which I only found when the cuts started burning the wood. Has anyone else had a tool sound off in a new way that meant you were doing something totally wrong?

3 comments

3 Comments

the_elliot1mo ago

Saw a youtube short about backwards blade sounds.

rowanharris1mo ago

Real talk, theres a physics angle nobody talks about with reversed blade sounds. The air flow gets all kinds of messed up when the sharp edge is moving backwards instead of cutting. It creates this weird turbulence that literally sounds different because the blade is basically throwing air around instead of slicing it cleanly. Ive heard it with circular saws too where the teeth are going the wrong way and it makes this angry buzz instead of the normal whine. The sound frequency actually shifts because the metal is vibrating differently under the wrong load direction.

laura_allen1mo ago

That high pitched hum thing is so real. I had a cordless drill start making this sad little whine, like a mosquito. I thought the battery was just low. Nope. I had it in reverse the whole time and was trying to drive a three inch screw. It just sat there spinning and complaining until I felt like an idiot.