string dents

[Andrew and Rebeca Anderson]

Mr. Lafargue,
Come back to that piano 24-48 hours later and tell us how the CA 
treated note's sustain is after the glue has fully set.  (I did this 
to a D pre-concert out of desperation trying to patch up a 
predecessor's savagery.  Two days later I couldn't find it without my notes.)

Andrew

At 09:30 AM 12/19/2006, you wrote:
>This is to report my experiences with the Estonia with the string 
>dents/false beats.  Thanks to everyone for your ideas.
>
>The bridge is dented on the speaking side of the cap.  I pulled one 
>note's unisons off, and filled the dents with CA and dripped some at 
>the base of the bridge pins in case they were loose.  I regraphited, 
>pulled the strings with a string hook to take the "dent" out of it 
>and pulled back to pitch.  I seated the strings gently and tuned.  I 
>found the false beats reduced into the background, but sustain was 
>GONE.  I suspect this is from a soft termination now with the CA.
>Then, I picked a similar note and just lossened and took the string 
>dents out.  This note was much improved with the false beats way in 
>the background, but still there (these are rapid beats).  I then 
>loosened the whole section, used a Hart string voicing hook (very 
>small radius) and smoothed all dents out as I could and retuned.  I 
>generally found it much improved, but again, many of the beats are 
>still there, but soft and in the background on most.
>
>I also noticed a muting of the false beats with a screwdriver 
>pressed on the offending string at the bridge cap AND I noted a 
>similar reduction with a pair of visegrips put on the back bridge 
>pin.  Thanks again.
>
>Lance Lafargue, RPT
>LAFARGUE PIANOS, LTD
>LPIANOS.com
>lafargue at bellsouth.net
>4244 Hwy 22 Mandeville, LA 70471
>985.72P.IANO
>----- Original Message ----- From: "RicB" <ricb at pianostemmer.no>
>To: <pianotech at ptg.org>
>Sent: Saturday, December 16, 2006 12:50 PM
>Subject: [SPAM] [CAUT] string dents
>
>
>>Hi Lance.
>>
>>I suspect the kinks themselves do little to contribute to the false
>>beats, and I doubt seriously un-kinking them will help. Rather... the
>>force required to create such a kink directed in against the
>>bridge/bridgepin is bound to cause some degree of springyness to the
>>termination as a whole. Not much you can do except to relieve that
>>condition as best as possible.  CA may help, repinning may help... you
>>might consider repinning with epoxy.  Check a few unisons to see how
>>deep/steep an indentation in the bridge wood has been made and look for
>>an elongation of the surface area around the bridge pin hole.
>>
>>Cheers
>>RicB
>>
>>
>>
>>    A "new" RPT tech working for me got a little excited about string
>>    voicing and in the process of "tapping" down strings on a new piano,
>>    went too far.  The strings were hit in the speaking length segment,
>>    in the direction of termination with the bridge pin V.  In other
>>    words, straightening the speaking length segment before it
>>    terminates at the bridge pin. Consequently, there is a visible
>>    "dent/kink" in the wire in the speaking length just before the
>>    bridge termination, creating more false beats than the ones that
>>    were to be eliminated.  Is there a cure short of restringing that
>>    section?  i.e., loosening string and straightening wire with hook as
>>    good as possible and retightening?  Thanks.
>>
>>    Lance Lafargue, RPT
>>    LAFARGUE PIANOS, LTD
>>    LPIANOS.com
>>    lafargue at bellsouth.net
>>    4244 Hwy 22 Mandeville, LA 70471
>>    985.72P.IANO
>>    -------------- next part --------------
>>    An HTML attachment was scrubbed...
>>    URL:
>>
>>https://www.moypiano.com/ptg/caut.php/attachments/20061215/26b5a245/attachment.html
>>