High tension? Low? Board stiffness? was Hammer Types

[David Love]

Not sure why this got posted again.  Please ignore.  

 

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 David Love
Sent: Friday, October 20, 2006 12:10 PM
To: files at ptg.org
Subject: High tension? Low? Board stiffness? was Hammer Types

 

 

One of the problems with assessing tension in scales is illustrated by the
data below.  The plain wire sections of the original scales on two pianos
are listed:  Steinway B and Knabe 6'4".  You can see that the range within
each piano is fairly broad.  Ever wonder why you had such a voicing problem
getting the low end of the tenor section to blend well with the bass on a
Steinway B?  On the Knabe you can see that the tensions range from a low of
138 to a high of 209 lbs.  Both of these pianos received a bit of scale
alteration.  

 

 

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

Knabe 6'4"

   Note          #    Length mm                        Wire Size
Tension lbs    

 

Snip.


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 

 

 

 

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Erwinspiano at aol.com
Sent: Thursday, October 19, 2006 7:14 AM
To: pianotech at ptg.org
Subject: Re: High tension? Low? Board stiffness? was Hammer Types

 

   Hi Alan

   You asked  about 20 questions but I'm answering only a couple.  Ronsen
Wurzen hammers are very consistent. 

I base this on having used a dozen or more sets.  SO the difference is in
the soundboard system/scaling/down bearing etc.

  I think of high tension low tension in terms of plain wire.  Steinway
scales , models S,M,l,O & the A's as 160 ish lbs per string on the plain
wire.  Models B,C,D have higher tension in the 180's or higher or tensions
that spike high like the C into the 190's.

  Other scale heads will have more to offer than this.

  As far as no. of ribs in general the more the merrier. Rather have too
much support than not enough.  You have to start paying attention to this
stuff so you can begin to draw some general conclusion your self.  How many
ribs how tall etc. where are the cut outs.  And remember most of the boards
you will see are compression crowned so how do you quantify that? Not!  

  Dale's general rule of thumb is that the stiffer the hammer requeiremnts
the stiffer the soundboard & vice verse.

  On the Wurzens you thought needed a thin dilution of  juice. The lightest
solution would probably give you enough of what you were after without
adverse effect or wait for a years hard playing.

  So may question so little time

  Dale

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