[pianotech] Bouncing Bostons

[Bob Haymes]

I work for a company that sells Bostons, and haven't seen hammer bouncing as an issue.  It sounds to me like the tails are sliding out of the backchecks.

bob

--- On Thu, 7/29/10, William Monroe <bill at a440piano.net> wrote:

From: William Monroe <bill at a440piano.net>
Subject: [pianotech] Bouncing Bostons
To: pianotech at ptg.org
Date: Thursday, July 29, 2010, 8:19 PM

Hi List,
 
Anyone know of anything chronic in Boston Grands (GP178) that has the hammer double striking on a quick/firm staccato blow?  I've got one that does.  Anyone have any ideas/solutions?  The piano is finely regulated otherwise (just today, in fact).  1 3/4" blow, about .400" Key Travel, Checking about 1/2", Rep springs are definitely NOT jumpy.  In all other ways, the action plays nicely, controllably.  And that is no mean feat.  I took some DW/UW measures today out of curiousity, and they were haywire.  DW range from 62g - 46g, UW from 18g to 35g or so.

 
My thoughts are turning to action pinning (haven't checked yet).  Key Bushings and pins are clean and lubed (teflon), but that's as far as we got.  Wondering if tight pinning (of any parts) might contribute to this rebounding back into the strings - and it is a full rebound.  You can watch the hammer appear to bounce off the rest rail, though I'm not convinced that is exactly what is happening.  Kind of musing aloud here.............. 


William R. Monroe



      
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100729/b4faf50d/attachment.htm>