1515 Rattling Sound - Bearings going?

[Revorocks]

Originally Posted by suicideneil

You can test if the rotor is ( badly ) unbalanced or not yourself- you just need some bearings and a non-magnetic stand to sit either end of the rotor on to spin it- a couple bits of wood with a V-notch for the bearing to sit in would work.

Also, consider that is the rotor was unbalanced enough to be a real problem, then the whole motor would vibrate like your mobile phone as it spins. If it just sounds a little off and isn't vibrating, and the temps are fine when you run it in a model normally, I wouldn't really worry so much- chances are it would have failed/shattered or turned into a washing machine full of bricks by now if it was a serious issue..

I did try testing to see if it was really unbalanced by using your method and it was fine, but then again it's not going to pick up small imperfections.

It doesn't really vibrate much, no more than my other motors, it just makes that noise.
Temps are fine too. Think you're right about if it was a serious issue something would've broken by now, so I imagine it's fine. I just wanted to be sure as I've sold it lol, and don't want get a reputation for selling bad stuff.

Cheers Neil