Re: First Tomos Clutch Turned - Tooling Complete

Joel P /
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> Dave Thacker Wrote:

> -------------------------------------------------------

> Why? Each bell 1/2 is stamped, welded together over the center section.

> They then machine the inside using the machined center section as

> center. The boring rounds out the inside of the bells. The outside

> remains as stamped and with poor alignment to center. If you measure

> the thickness of your bells, you will wide variation in thickness. If

> the clutch is .015" thicker on one side than the other (and they usually

> are) then there is more metal one side than the other which = gross out

> of balance. Out of balance does not feel good and it gobbles up horse

> power. It takes energy to shake the shit out of things.

Right, you answered your own question in your reply.

Because it is stamped not only is the wall thickness varied on the edges but the face and also to some degree the flat that the hub is welded to (the drawn metal has to come from somewhere)

So all of that can add to your total imbalance, just because something is round to something else does not mean it is balanced. Better than it was, possibly but I wouldn't call it balanced.

I balance stuff on an IRD balancer fairly often. It balances dynamically using 2 load cells on a floating platform we do lots of things like shaft couplers, BIG rotors and everything in between. I also statically things like grinding wheels and odds and ends. round and true != balanced..

If your going this far to quell vibration, what is getting 4 bearings and making a simple static balance stand? You already have the mandrel to hold the parts.

Its not skin off my back either way, just throwing it out there your half way there, why not make it as good as it can be?

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