Flange Center Friction Increase

[Farrell]

Yeah, I simply repinned about 80 of the flanges. Was just looking for some sort of explanation of what would cause such a reaction. Seemed pretty darn weird to me. Working on this 1990 YC action has given me a bit of insight as to why some pianos cost less than others. The bushings are incredibly varied - some are rather black inside, some are red, some are pink - after reaming, some burnish real nice a smooth, some squeak, and some you can't even burnish with the same Mannino tool you just reamed with. Seemingly horribly inconsistent. It is as if three different types of bushing felt was used. Not a good thing I should think.

Terry Farrell
  
----- Original Message ----- 
From: "Ron Nossaman" <RNossaman@cox.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: Wednesday, July 16, 2003 9:39 AM
Subject: Re: Flange Center Friction Increase


> 
> >I am refurbishing a YC grand action. Hammer shank flange center friction 
> >is all over the place, so I am repinning most centers. Some of the 
> >low-friction centers have the following characteristics: First swing test 
> >- 9+ swings, then each time I test the swings, the number of swings drops 
> >by one. So after the ninth (or there abouts) swing test, I'm only getting 
> >one swing.
> >
> >What is that all about? And ideas?
> >
> >Terry Farrell
> 
> 
> It's the center pins. Try this. Find one that swings 6+ times and side 
> stress it a bit as you manually push it through it's swing arc a couple of 
> times. Then swing test it again. It will likely have seized up enough to 
> not swing at all. The only remotely right way I know to fix it is to repin. 
> I have, under duress, alcohol shrunk and lubricated a Yamaha action that 
> was doing this, and as far as I know, the problem hasn't returned. Except 
> that when I finished, ALL the hammers swung 9 times.
> 
> 
> Ron N
> 
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