Samick (again)

[Jim Coleman, Sr.]

Hi again Richard;

I have seen centerpin plating flaking off on Yamaha, Kawai and Korean
pianos. No amount of shrinking solution will help this situation. Repinning
is the only option. I have looked at the ends of thes pins under 
microscopes. There is a definit scoring around the pin ends. One technician,
deceased, had suggested that the silicon in the factory treatments had 
turned back into glass and had therefore been the cause of the scoring. At
the time it made sense to me, but I have not proven this theory. If it were
true one would expect to see granules of glass in the bushing cloth. Others
have suggested that the hide glue wicked into the felt and caused the 
scoring. I have never seen this phenomenon on american made piano actions.

Jim Coleman, Sr.


On Thu, 20 Aug 1998, Richard Moody wrote:

> 
> 
> ----------
> > From: Susan Kline <skline@proaxis.com>
> > To: pianotech@ptg.org
> > Subject: Re: Re:  Samick (again)
> > Date: Wednesday, August 19, 1998 5:52 PM
> > 
> > List, Richard, Avery, Jim --
> > 
> > Everyone seems so sure that tight flange bushings are the problem, yet
> I've
> > never known a Samick to seize up from anything except failure of the
> center
> > pin plating. 
> 
> HMm   If the easing methods work from lubes or shrinking solutions, I
> would never look at a c pin.  Darn, on hind sight I should have "watered"
> the action on that Samick since it has been such a sure fire remedy. After
> that, the seller, who was also a technician could have re-pinned to his
> heart's content. I wonder what the content of the felt bushings are? 
> 
> Richard
>