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jb_turner

Elite Veteran

USA

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"Honestly I think more harm than good can come from all this."

Right on!

"cones aren't always completely centric"

They are NEVER completely centric and same with the balance shaft on a Robart is never straight.

If you have a high freq problem it is almost 100 percent related to alignment/mixture issue... NOT fan/bell balance issue.
If you insist on drilling a fan NEVER drill underneath a blade because this may cause problems down the road.

JB "Do a SEARCH" Turner

10-19-2008 Over year old.
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Uplink Tom

Senior Heliman

State College PA

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"cones aren't always completely centric"
Just the reason I rotated the cones and turned the bell between every measurement 20 times, and then put it on the shaft the opposite direction and did the same.

10-19-2008 Over year old.
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witeout

Heliman

USA

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vidio of fan balance

http://www.moretraction.com/helis/setup%20videos.htm

follow link nice vidio

10-19-2008 Over year old.
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i6pwr

Heliman

Manassas, VA

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Would it be a safe assumption to not balance the clutch with the rest of the assembly since it engages at different points all the time?

I would think to balance the clutch seperately or you will be chasing an imbalance for ever.

10-19-2008 Over year old.
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Aaron29

rrProfessor

USA

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Well in theory if the clutch is balanced independently, and the bell is balanced independently, then it won't matter where it engages. It will be in balance.

If you try to balance the clutch and bell as one unit, then the position will matter.

But in any case, I've never balanced a clutch or bell. They are good enough from the factory.

Most fans are too.

10-19-2008 Over year old.
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Uplink Tom

Senior Heliman

State College PA

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After clutch bell balance>

Slight improvement in fuel foaming....not totally gone.
The Caliber 50 also uses a brass flywheel under the clutch. Today I turned down a steel shaft on the lathe to fit in the flywheel, then rotated it on a dial indicator. It's only .0026 out, so I'm going to leave it alone. I guess I'll see how a few more tanks do on engine break-in. I do like those ice bearings in the video though.

Tom

10-20-2008 Over year old.
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Way2slow

Veteran

Jeffersonville Ga

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One note: I would only try to balance a new clutch shoe. Even then I take a dial caliper and check it for roundness. Once it has been spun and the centrifical weights have moved, no telling what you might end up with if you try to balance it.

10-20-2008 Over year old.
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