YC Strike Weights etc

[David Stanwood]

It just so happens that we are working on a Mason & Hamlin A right now and 
the Balance Rail pins between the sharps and the naturals are very close 
together.  A survey of 18 notes across the keyboard reveals an average 
strike weight ratio of 5.7 in the naturals and 6.2 in the sharps.  We are 
setting a new ratio of 5.3 throughout because we want to throw 1/2 High zone 
weight hammers.  We are laying out two separate capstan/heel lines to 
acheive this.  It's the overall ratio that counts so if the sharps are 
different you can certainly correct them with a separate line and get 
uniform ratio and therefore similar dynamic touch between sharps and 
naturals.... Using Strike Weight Ratio to determine the correct position is 
a convenient method.  Changing the capstan position on the sharps simply 
compensates for the higher key ratio on the sharps.  We've done this many 
times over the years with excellent results...

David Stanwood


>From: Richard Brekne <Richard.Brekne@grieg.uib.no>
>Subject: Re: YC Strike Weights etc
>Date: Mon, 05 Nov 2001 22:22:56 +0100
>
>Isaac OLEG SIMANOT wrote:
> >
> > Just a question,
> >
> > If you relocate the capstan on the blacks only, you will have the 
>contact
> > point on the whippen heel changed, so what you gain one way you loose a 
>tad
> > the other. What happen to hammer and key travel now ?
> >
> > I just cant understand how you can expect to have an even touch with the
> > capstan differently on white and blacks. The hammer acceleration will be
> > different from key to key, is not it ?
> >
> > Regards.
> >
> > Isaac OLEG
> >
>
>The actuall problem is that the leverage is already
>different on the white and black keys. Probably due to a
>frig up in figureing placement of the Balance rail pins. So
>I already have some of these problems. I am not convinced
>that moving to a staggered capstan position is the right
>thing to do. But it is an interesting idea to check out. It
>doesnt hurt to look closer at the option thats for sure.
>Certainly one objective should be to get as uniform a
>whippen travel as is possible for the same amount of key
>travel.
>
>But you mention hammer acceleration... and in all this about
>Stanwood I cant remember seeing anything about that ever
>mentioned... and I would suppose its an important enough
>issue. Anyone got any good words of wisdom on this tangent ?
>
>
>
>
>--
>Richard Brekne
>RPT, N.P.T.F.
>Bergen, Norway
>mailto:rbrekne@broadpark.no


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