[pianotech] pianotech Digest, Vol 53, Issue 36

[James McCormac]

David,
Check the explanation for growing lead at the following:
http://www.navsea.navy.mil/nswc/carderock/pub/cnsm/lead/lead_02.aspx
I suspect that your Bosendorfer was kept tightly closed. The out-gassing of
the wood created an environment that fostered the deterioration of the lead.
As for Wim's observations, perhaps the process is fostered by the presence
of high humidity.
AS an aside -- I appreciated your classes on hammers and voicing.
Jim McCormac, RPT
San Diego

---------- Forwarded message ----------
> From: "David Love" <davidlovepianos at comcast.net>
> To: <pianotech at googlegroups.com>
> Cc: pianotech at ptg.org
> Date: Tue, 12 Mar 2013 13:27:30 -0700
> Subject: [pianotech] Expanding leads
> While I have run into expanding lead problems periodically generally they
> seem to have been reserved for "lesser" pianos.  Today I found a 1950's
> Boesendorfer 200 with leads expanding both in the back action and the keys
> to the extent that they were binding on their neighbors and on the verge of
> splitting things.  Of course I will have to remove and replace, a large
> task considering the new weigh-off at the key end that will be required.
>
> My question is what is it that causes that reaction and why after such a
> time does it happen.  This is some 60 years later.
>
>
> David Love
> www.davidlovepianos.com
>
> _______________________________________________
> pianotech mailing list
> pianotech at ptg.org
> https://www.moypiano.com/resources/#archives
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20130312/0be0c65f/attachment-0001.htm>