popsicle stick engineering

[David Love]

Any ratio (within reason) can be made to work as long as lines of
convergence are reasonable and the SWs are a good match for the ratio.
Whether or not a high ratio piano such as this will sound good with a very
light set of hammers is another issue that I won't venture into but most
likely it will be fine-might even be better!.  I have tweaked many pianos of
this vintage with 17 mm knuckles, slight capstan moves and somewhat lighter
hammers with good results.  There is always the option of assist springs to
consider as well.  

 

David Love
davidlovepianos at comcast.net
www.davidlovepianos.com 

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Kent Swafford
Sent: Sunday, October 29, 2006 5:07 PM
To: Pianotech List
Subject: Re: popsicle stick engineering

 

You know, when I tell people at the university that a piano was a dog from
the beginning and that new parts over the years have only made things worse,
they look at me like I'm crazy. On the other hand, one seems to always be
able to get pianists to agree that there is not much of anything worse than
a bad S&S. Maybe they just think I'm crazy for suggesting that an instrument
with manufactured-in canine characteristics could actually ever be changed
into a fine instrument.

 

Did you mean "acceptable ratio may not be _achievable_"? Or did you mean to
say that even with a good ratio, this action might still have unacceptable
characteristics?

 

 

Kent

 

 

On Oct 29, 2006, at 5:37 PM, Erwinspiano at aol.com wrote:





  This is really out there. Even with a capstan move an acceptable Ratio may
not be acceptable without a new set of keys & a balance rail in a different
spot.

  Dale

5.6? This is on a Steinway B that currently has a SWR of 6.5 with  
17mm Steinway shanks.

Kent


On Oct 29, 2006, at 9:29 AM, David C. Stanwood wrote:

> Hi Kent,
>
> Strike Weight ratios will always vary note to note.  Better to hit  
> an average Strike Weight Ratio level using a straight capstan  
> line.  This means finding sample capstan positions across the key  
> board that hit the target SWR.  When you hold a straight edge to  
> the sample marks they will not all be exactly on the line.  Strike  
> you new capstan line such that it comes closest to all the marks.   
> Let the key ratio be what ever it is to be to make your target  
> SWR.  What is your target SWR?
>
> David S

 

 

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