string dents

[Lance Lafargue]

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
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