S&S D with high strings/low action stack

[Stéphane Collin]

Hello John.

When boring hammers, should we favor strictly the string heigth minus shank 
center heigth at the cost of no straight hammer heigth at rest (reflecting 
the not straight strike line heigth at strings) ?
Also, when gluing hammers on shanks, should we favor the hammer crowns 
straight line at rest, at the cost of aural best position ?
In other words, how much should we care about aesthetics when doing hammer 
work ?

Best regards.

Stéphane Collin.


----- Original Message ----- 
From: "John Delacour" <JD at pianomaker.co.uk>
To: "Pianotech List" <pianotech at ptg.org>
Sent: Monday, October 09, 2006 10:48 PM
Subject: Re: S&S D with high strings/low action stack
> I've no experience of American 4 year-old Steinways but every Steinway 
> grand I've ever measured, and most other makes too, have an arched strike 
> line with a difference of several millimetres between the string height at 
> note 21 (lowest on long bridge) and that at note 88.  That difference, and 
> also the difference in string angle to the horizontal ought to be taken 
> into account when boring the hammers, since the rails should surely be 
> straight and not arched.  If the hammers are wrongly bored on this Friday 
> grand, as seems very likely to me, then the proper solution is to throw 
> them out and fit a set that is properly bored to the actual dimensions of 
> the piano.
>
> JD
>
>
>