YC Strike Weights etc

[David Love]

By setting all the key ratios at .53 do you actually get uniform SWR in such
a case, or does the difference between the contact points on the wippen heal
with varied capstan lines throw that off a bit.  If you are trying to get
uniform SWR, wouldn't the key ratio between sharps and naturals have to be
slightly different?

David Love


----- Original Message -----
From: "David Stanwood" <dstanwood@hotmail.com>
To: <pianotech@ptg.org>
Sent: November 08, 2001 2:15 PM
Subject: Re: YC Strike Weights etc


> 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 t
he
> > > 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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