Touch Weight

[madelyn mrykalo]

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James Ellis <claviers@nxs.net> wrote: 


Touch weight and inertia are NOT the same thing at all. "Tough weight" is
merely a measure of static force. "Inertia" is a dynamic quantity.


Neither is front weight the same thing as moment of inertia, which I have already said.


That's why putting more leads closer to the center of the keys
will result in less "KEY" inertia. You will have to use more lead, but the
"key" inertia will be a little bit less. However, the keys are NOT where
most of the total action inertia comes from. It comes from the hammer
heads out on the ends of the shanks, because that's where the (mass x
velocity squared) is concentrated.

All I'm saying is that moving the leads closer to the centers of the keys
is not going to buy you very much, because that's not where most of the
total action inertia is coming from in the first place.

But then that is the only place we can change the moment of inertia, unless we lighten the hammer.

What it will do is
weaken the keys, especially if you drill more holes, plug holes, etc.

That's probably not going to be a problem.


Those two things are about all it will do for you, other than just making
the keys heavier in the middle. So, before you haul off and re-do a whole
set of keys, drilling more holes, adding more leads, plugging holes, and
moving all the leads closer to the center, remember: It won't buy you very
much towarding lowering the overall action inertia, because that's not
where it's coming from, but it will definitely weaken the keys.

If we are going to change the front weight anyway, because we are also changing out hammers, the MOI might as well be dealt with then too.

Merry Christmas, Jim Ellis


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Vince Mrykalo
University of Utah

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