[pianotech] Increasing bridge height

[Will Truitt]

Hi Jude:

 

Your comments seem fair and appropriate - we always should try to be aware
of the impact the changes we make in a piano are going to have elsewhere.
It is important to proceed with educated caution, or not - there are enough
problems in the work we do without us creating new ones, what I call the
"Oh, S-t", factor.  

 

Though your response may technically correct, I am gathering from others
that they do not regard such changes (within the parameters we have been
discussing) as to be meaningfully significant, and their end results don't
seem to indicate that the action has been compromised.

 

Still, I would want to ask you HOW you would go about determining beforehand
that you will be on reasonably safe ground in the action before proceeding
to make changes at the bridge as discussed.

 

Much thanks to you for your contributions to this thread.

 

Will

 

 

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Jude Reveley/Absolute Piano
Sent: Tuesday, March 24, 2009 8:51 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Increasing bridge height

 

I agree in spirit while I take issue with your premise. Perhaps I'm too hung
up on symantics but to answer the question truthfully, does a change in
string height that is matched in a change of hammer bore affect the
leverage? The answer is undeniably yes. Granted a 5mm string ht/hammerbore
change might only reflect a change of a few tenths per unit of action
leverage. As to whether the change is significant or anymore of a factor
than any other inconsistency within a piano from note to note is another
matter. My point is to encourage accurate statements and to define the
parameters in which we are working. To encourage changing string heights
without a discussion of the affects on entrance height and action geometry
is risky. It's tricky business, fer sure.

 

Jude Reveley, RPT
Absolute Piano Restoration, LLC
Lowell, Massachusetts
(978) 323-4545

 

----- Original Message ----- 

From: "John Delacour" < <mailto:JD at Pianomaker.co.uk> JD at Pianomaker.co.uk>

To: < <mailto:pianotech at ptg.org> pianotech at ptg.org>

Sent: Tuesday, March 24, 2009 7:22 PM

Subject: Re: [pianotech] Increasing bridge height

 

> At 11:24 -0700 24/3/09, David Love wrote:
> 
>>It does?  How.  If you raise the string plane and increase the bore 
>>distance accordingly so that the shank angle at rest is the same as 
>>it was before, how does the leverage change?
> 
> It doesn't, of course.  A tiny difference in the initial touch weight 
> will result, but so tiny as not to signify anything.
> 
> JD
> 
>>>Of course, changing the bore distance does affect the entire action 
>>>leverage...
>>>
>>>Jude Reveley, RPT
> 
> 
> 
> 
>

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