Brash Failure

[Gevaert Pierre]

Joe,

 

A small Erard Square from 1804 that I’ve been restoring this year (with the
original sound board) has a nice tone and a long sustain.

It is a verry small soundboard and the string pressure moved the board
downward causing a dip around the bridge.

Except for this the piano was remarquably well preserved (wich is not often
the case) and I suppose for that reason that the is still good enough to
produce a good sound. (the piano is tuned at 390 hz)

 

Regards,

 

Pierre Gevaert

 

P.s. Concerning the regulating of this double pilot action from Erard (we
exchanged some words about it last year) I had quite good results with a key
dip of 6 mm and quite a bit of lost motion between the upper pilot and the
hammer shank.

The funny thing about this type of action without escapement is that you can
repeat a same note verry fastly and close to the string and thus produce a
fast tremolo.

 

 

-----Message d'origine-----
De : pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] De la part
de Joseph Garrett
Envoyé : samedi 19 août 2006 18:07
À : John Delacour; Pianotech List
Objet : Re: Brash Failure

 

John,

Have you, in your clientele list, a piano of an 1805 age? If not, then you

would not know of what I speak. How about 1814? No? same answer. As for the

"petrification of wood, we all will not live long enough to find out if it

will happen. However, I have seen many examples of many different types of

wood that cannot be repaired due to the cellular breakdown of the wood

itself. All things deteriorate. (period) IMO Just because you, personally,

have not experienced this, does not mean that it isn't so.

 

Joseph Garrett, R.P.T.

Captain, Tool Police

Squares R I

 

 

> [Original Message]

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

> To: <joegarrett at earthlink.net>; Pianotech List <pianotech at ptg.org>

> Date: 8/19/2006 2:52:10 AM

> Subject: Re: Brash Failure

> 

> At 9:27 pm -0700 18/8/06, Joseph Garrett wrote:

> 

> >Perhaps you need more diverse experience.<G> Some of your 

> >suppositions are not valid, IMO.

> 

> I'm not surprised you should say so, Joe, since on Saturday, October 

> 23, 2004 Joseph Garrett wrote:

> 

> >The one thing that gets me to NOT want to do a re-ribbing of an olde 

> >board, is the fact that wood does age. Forget the compression factor 

> >for now. Let's just consider this: In the aging process of wood, it 

> >loses it's cellular cohesion/bonding. At some point, this aging 

> >process creates what is known as Brash Failure. If wood is kept in a 

> >consistant environment, it will eventually turn to stone, (ie 

> >petrify). The Brash Failure occurs about half way to the petriying 

> >stage.

> 

> Now while I recognise that my experience may not be as diverse as 

> yours, I have never seen or heard of any piece of wood in a piano 

> that has turned to stone in any "consistant environment" in which a 

> piano can survive. By your reckoning you are familiar with some 

> pianos that are well on their way to petrification.  Since my 

> suppositions are invalid, according to you, I suppose you will be 

> glad to point us to a web site or some learned volume that will 

> validate your own rather interesting theory.

> 

> JD

> 

> 

> 

> 

> 

> -- 

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