Young Chang Syndrome

[Delwin D Fandrich]

----- Original Message -----
From: Susan Kline <skline@proaxis.com>
To: <pianotech@ptg.org>
Sent: January 06, 2000 7:40 AM
Subject: Re: Young Chang Syndrome


> Del wrote:
>
> >  Mostly the problems only developed in the hammer butt
> >flanges.  Which makes sense -- the angle of rotation is fairly great and
the
> >stress loads are high.  When compared bushings between the parts that
gave
> >us problems with those that did not, we found that there was considerably
> >more graphite in the frozen parts than in the non-frozen parts.  At least
> >the bushing cloth in the parts we had the most trouble with was
considerably
> >darker inside the pin hole than was the cloth in parts that did not
exhibit
> >these problems.)
>
> I noticed that the cloth was darker, but if I thought about it, I believe
> I thought that the metal fragments had darkened it.
>
> Although hammers are the worst, I have seen seizing plated center pins in
> every action part, including the underlevers and the rep levers. I have a
> lovely photo of a Samick wippen lying on a table, with the jack sticking
> out through the rep lever, even with the spring still in place. It was
like
> the piano was sticking its tongue out at me.
>
> Susan
>
------------------------------------------------------------

The parts we used in our actions were made by Renner.  In these parts, since
we saw no evidence at all of plating problems on their pins, we assumed that
what we were looking at was graphite.  This was confirmed in our
correspondence with Renner.

I have no recent experience at all with Samick pianos so am unable to
comment either way on their parts.

Del