HAMMER HANGING JIG, from spurlock

[Richard Day]

>From: Stéphane Collin <collin.s@skynet.be>
>Reply-To: Pianotech List <pianotech@ptg.org>
>To: "Pianotech List" <pianotech@ptg.org>
>Subject: Re: HAMMER HANGING JIG, from spurlock
>Date: Fri, 20 Jan 2006 09:09:20 +0100
>
>Hello all hammers hangers.
>
>I've used the Spurlock jig, but I found that especially in the top trebble 
>hammers, if the shoulders are on a perfect straight line, the strike points 
>are not and vice versa.  The Spurlock jig assumes that the piece of felt 
>where the hammers come from is perfectly tapered to begin with, and stays 
>so after pressing, which I found was not always the case in the sets I 
>hung. Also, the straight line in all 88 hammers assumes that the 
>plate/agraffees/capo arrangement is precise enough to place the resulting 
>correct strike points in that straight line (sorry for my approximate 
>english), which I also found not always to be true, especially between the 
>agraffee section and the capo section.  The best striking point is easy to 
>determine by hearing the sound of the note, and when you place the last 
>hammer in agraffee section and the first of the capo section by ear, you 
>could sometimes notice that they don't line up with the rest.  Same at 
>other sections borderline, at each side of a strut.  Of course, hanging the 
>hammers in different sections at even slightly different distance from 
>center pin induces geometry discrepancies, but, if not extreme, I found 
>those easier to deal with than voicing out the transitions between 
>sections.
>So I like setting the first and last hammer in each section at the correct 
>angle, copied from old hammers, and at the place they sound best, then line 
>up the hammer moldings in that section with a straight edge put under the 
>shanks, and eyeball the strike points to be in straight line in that 
>section, using a glue that doesn't set too quickly so I still can make 
>slight adjustments when looking at the whole section.
>What do you think ?
>
>Best regards.
>
>Stéphane Collin.
>
>
>_______________________________________________
>Pianotech list info: https://www.moypiano.com/resources/#archives