A thread on another forum on handbar vibration

[Sibbo]

http://www.suckindiesel.com/thingy/view ... 763#p12763

A couple of good explanations and a neat home made solution .

[Garnet]

Thanks for that. I need to do something on my R26.

[mattcfish]

Anybuddy ever try filling the ends of the bars with loosely packed lead shot?

[mattcfish]

Thanks for that. I need to do something on my R26.

Damn nice boots!

[Sibbo]

An exert from the link ...


Re: A cure for vibration white finger

Postby XLerate » Sun Nov 20, 2011 3:19 am
Just offhand I'd say the cleverness of Stuart's design isn't in the specific weight, but is in the o-rings. That way the weighted ends can absorb the harmonics through the screw & cancel them by the rubber.

That is, a vibration wave comes down the tube and through screw, into bar end, which is a different sort of mass causing vibration wave form to change in bar end. The rubber then delays the time when it would begin to be in sympathetic vibration to the tube's vibration wave, so it upsets the wave harmonics, in effect absorbing & cancelling vibration wave form. More the fact that it's a solid steel or aluminum slug isolated by rubber, changing vibration wave, instead of continuance of wave form in the tube.

Not sure if that's why you asked about the weight, just my observations on why it works.

[mattcfish]

An exert from the link ...


Re: A cure for vibration white finger

Postby XLerate » Sun Nov 20, 2011 3:19 am
Just offhand I'd say the cleverness of Stuart's design isn't in the specific weight, but is in the o-rings. That way the weighted ends can absorb the harmonics through the screw & cancel them by the rubber.

That is, a vibration wave comes down the tube and through screw, into bar end, which is a different sort of mass causing vibration wave form to change in bar end. The rubber then delays the time when it would begin to be in sympathetic vibration to the tube's vibration wave, so it upsets the wave harmonics, in effect absorbing & cancelling vibration wave form. More the fact that it's a solid steel or aluminum slug isolated by rubber, changing vibration wave, instead of continuance of wave form in the tube.

Not sure if that's why you asked about the weight, just my observations on why it works.

Exactly. Seems to me that small lead shot would bounce around in the bar and deaden the vibration. Haven't tried it, but I'm thinking I might although the new motor is much smoother at higher RPM's.

[Garnet]

Wouldn't a handlebar full of lead shot be a bit heavy compared to bar ends?

[mattcfish]

Wouldn't a handlebar full of lead shot be a bit heavy compared to bar ends?

Not the whole bar silly, just the ends where the grips are. The idea is that they have lots of room to bounce around.
You could weigh out the shot and put whatever weight you want.

[Major Softie]

Wouldn't a handlebar full of lead shot be a bit heavy compared to bar ends?

Not the whole bar silly, just the ends where the grips are. The idea is that they have lots of room to bounce around.
You could weigh out the shot and put whatever weight you want.

I've done that on clip-on style bars, and it didn't seem to be as effective as logic had told me it ought to be.

[Sibbo]

http://www.suckindiesel.com/thingy/view ... ?f=2&t=463

That thread is still boiling along with some good info posted .