upright balance weight

[Terry]

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Hi Terry, questions on uprights? Not worthy, not worthy. Except I have =
paying customers who don't have room for a grand, love the old piano =
cases and want them to work well.=20

I think you misinterpreted my comment. I do not question doing =
high-level work on an upright, but rather I'm an very interested and I =
think a quality upright is very much worth putting the effort into it. =
So that is why I say that I have many questions about upright =
touchweight - so little has been written about it. Yes, I realize many =
will say they are not worth the effort, but they can be. And there is =
one more reason to add to your list of reasons one may want to have one =
- they can be fabulous instruments!

I think it is simpler if we look at the fact that the hammer weight has =
no effect.=20

Ah, but it does. Inertia. Won't affect static weights, but will become =
obvious when playing

I hung the heaviest Wurzen felt Ronsen hammers on the thing and the DW =
was the same at the bass as the treble. The friction becomes equal note =
to note and less than on a grand because the friction at the hammer butt =
is basically nothing. This being the case, the leading is the same from =
note to note to achieve the same balance of the key and DW can be =
achieved this way. I don't like actions with a 56 gram downweight. Too =
heavy.=20

I don't know this for fact, but I strongly think that you will not want =
the same leading from key to key. You will want more in bass and less in =
treble, much like a grand, so that the inertia will have the feel of =
mass in the bass and light in treble. Also, the hammers do rest against =
the rest rail - there will be a bit of difference in DW due to hammer =
movement even with a static measurement.

The key ratio is a 1.66 so I'm thinking the factory got the balance rail =
off by 1/8 inch. You have to double the balance rail mistake soI figure =
a 5mm capstan move should do it. By tilting the capstan I should pick up =
3 grams DW. The 5 mm will be  along the top of the key and the top of =
the capstan will move 2 to 3 mm in relation to the sticker. Total I =
expect to pick up 4 to 5 grams of DW.  There is room on these stickers =
to come that far forward but I can always remove the rail and take out =
some wood to move the bottom rail where ever I want. That's the beauty =
of long stickers.

What is the overall action ratio?

I certainly don't want to lighten the action by adding lead. Removing =
lead might make it free wheel, not enough mass. I want to see if =
changing the geometry to solve the DW problem will give it the "snap" =
I'm looking for.

That's why I was asking how much lead is in the keys? If there is too =
little, adding lead could be the ticket!

Thanks for your interest Terry. No pictures yet. I'll have to get some.

Would love to see them.

Terry Farrell
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