While I was using my powerball it suddenly started to vibrate.After a few starts of the powerball while i was running it with about 10 000 rpm the vibrations dissapeared but when i got to higher rpm it started to vibrate again.It vibrates while i'm speeding it up.It doesn't when it runs on it's own.I opened the powerball but i didn't find anything broken.If someone can help me I'll be very thankfull.
Last edited by Marto; 18-12-2007 at 10:24.
What model do you own? For how long have you owned it? How often do you clean it?
Seems like the well-known resonance sound to me.
I noticed that some powerballs suffer more from this than others.
And it has nothing to do with cleaning.
My current theory is that powerballs which exhibit this resonance sound a lot last shorter than powerballs which exhibit it less.
Does anybody else have a comment on this? (Akis?)
I've had this problem once before, and at the time I had no idea what was causing it. It was very strange...a definite vibration, which to me indicated a cracked rotor, but then the vibration would go away, and it would be smooth as anything for a few seconds, then the vibration would return.
Your problem might be totally different to mine, but I will say that this occasionally vibrating rotor turned into a permanently vibrating rotor for me, which confirmed my fears of a cracked rotor or bent axle. (I could never actually SEE any cracks, but the vibration got worse and worse, and I could actually see the rotor moving up and down a bit as it spun slowly, definitely indicating a bent rotor.
If it doesn't stop, I suggest you fill in a repairs form, (link in my signature).
Honesly, I think that the cracked rotor roaring sound is different from the vibration sound, but I could be wrong. What is at least striking is that some powerballs suffer from this and some don't or to a much lesser extent.
I am very curious what Akis findings are in this respect. After all, I am just an electrical engineer and a patent attorney and not a powerball champ .
I'm afraid I don't have any detailed explanation of the phenomenon, but I think I know what you are talking about. This resonance sound is not a cracked rotor (which sounds like an old washing machine) or an imbalanced rotor (which vibrates and impedes speeding) but rather a... resonance sound :-)
Originally Posted by The Force
If we are talking about the same thing, I have experienced it a few times but only on new (not worn-in) balls. But this doesn't necessarily mean that the rotor is defective; the resonating sound should disappear if you keep on running the ball in at a mild pace. However don't try to speed it up violently or you may get the washing machine! :-)