[pianotech] Bouncing Bostons

[William Monroe]

Thanks Wim,

Pinning seems like the row.  Checking just really doesn't seem to be
involved.

WRM



On Thu, Jul 29, 2010 at 9:09 PM, <tnrwim at aol.com> wrote:

> William
>
> A couple of ideas you might want to try
>
> 1. Sand the bottom of the tail, and take the edge off. Got this advice from
> Kent S. and it worked on quite a few hammers on a S&S
> 2. Check the balancier pinning. Remove the spring, and feel the lever.
> There should not be any resistance.
> 3. Does increasing or decreasing the check distance do anything at all, or
> does it still bounce?
>
> Wim
>
>
>
> -----Original Message-----
> From: William Monroe <bill at a440piano.net>
> To: pianotech <pianotech at ptg.org>
> Sent: Thu, Jul 29, 2010 3:19 pm
> Subject: [pianotech] Bouncing Bostons
>
>  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/20100729/801a0963/attachment.htm>