[pianotech] Determining Balance Weight

[David Love]

That's because changes in friction won't change the balance weight.  That's
the idea, of course, that by removing friction from the equation you can
measure balance weight and not worry that friction will create a randomness
that will be present when only using the downweight.  

 

David Love

www.davidlovepianos.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Victor Belanger
Sent: Monday, August 17, 2009 9:58 AM
To: pianotech at ptg.org
Subject: [pianotech] Determining Balance Weight

 

Thank you David,

 

That is a lot of help. I just did not know where to start.

I tried one action with trying to get the BW around the 38 range, played
with friction and got it in the ballpark but I had the hardest time. I knew
that there was a better way to go through this.

 

Victor Belanger

 

------------------------------

Message: 7
Date: Mon, 17 Aug 2009 07:39:46 -0700
From: "David Love" <davidlovepianos at comcast.net>
To: <pianotech at ptg.org>
Subject: Re: [pianotech] Determining Balance Weight
Message-ID: <002f01ca1f48$92184190$b648c4b0$@net>
Content-Type: text/plain;        charset="US-ASCII"

I should add that customer preference will also be a factor.  My general
range of BW choices is 34 (light) to 42 (heavy).  I don't venture outside
that range very often unless there is a specific request.  

David Love
www.davidlovepianos.com <http://www.davidlovepianos.com/> 


-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of David Love
Sent: Monday, August 17, 2009 5:52 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] Determining Balance Weight

Only experience will let you know what balance weight to use. My default is
37g.  Some go lighter some heavier.  For a given BW the action will yield a
DW and UW depending on friction.  Weigh off the action DW and UW and you
will have a chart note by note of the BW for the entire action.  Change the
front weight on each note to alter the BW to make the entire action uniform.
The change is made at a rate of 1:1. That is add 1 gram to the front weight
to reduce the BW by 1 gram.  Any change in friction will not alter the BW
because the DW and UW will change in opposite directions.  

That's the reader's digest version anyway.

David Love
www.davidlovepianos.com <http://www.davidlovepianos.com/> 


-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Victor Belanger
Sent: Monday, August 17, 2009 5:23 AM
To: pianotech at ptg.org
Subject: [pianotech] Determining Balance Weight

Hello everyone,

I have looked at the archives and cannot find an answer to perhaps a  
naive question but how does one determines which balance weight number  
to use?
I am in the process of installing hammers and shanks to a Steinway "A"  
action using what I learned in the action touch design class at the  
Convention and am slowwwwly going through it. The whippens are fairly  
new, and will check the Rep. lever pinning on all.
I understand that when I use a balance weight number, then I can use  
an appropriate DW & UW without varying the BW to some degree.
Can someone give a basic step procedure to this process?

Thanks.

Victor Belanger
Belmont, MA

 

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