My most heartfelt thanks, BUT........( new Yamaha w/bobbling hammers)

[antares]

Hi Gordon,

I too have wrestled with this Yamaha upright problem.
According to me, the angle and position of the jack is such that it is 
hard for the jack to away get from under the butt.
I have tried several things myself in the past.
1. I used a thicker cushion, which immediately helped but the hammers 
lost power, so no good.
2. When encountered with this problem, I always take out all the keys, 
spray the balance and front rail pins with McLube, and make sure that 
the keys have very little friction.
Any friction before the jack movement may add to the problem. A more or 
less friction free start helps the jack to get out from under the 
hammer butt.
3. I made the striking distance smaller by gluing some thick red felt 
on the hammer rail rest. Thus helped very much because the angle and 
position of the jack improves, but you lose some power because the 
striking distance gets smaller. A compromise may be the answer : raise 
the hammer rail just a bit and adjust the action.
4. I have noticed this problem also, and in particular, with Schimmel 
uprights. Lubing the jack heads with McLube helps immediately and is 
extremely effective, especially in combination with a sharp regulation.
With plastic jacks however, you have to be very careful and not spray 
too long and too much, the plastic may turn into a candle.


friendly greetings
from
André Oorebeek

Amsterdam -
The Netherlands

0031-20-6237357
0645-492389
0031-75-6226878
www.concertpianoservice.nl
www.grandpiano.nl

"where music is, no harm can be"



On 13-apr-04, at 19:33, gordon stelter wrote:

> Dear List,
>      I am truly and deeply touched ( with no sarcasm )
> by the outpouring of suggestions regarding my
> wrestling match with this U3! I will implement these
> suggestions and get back to you.....HOWEVER...
> ( special to Mr. Brekne ) YES, I did take out the lost
> motion on a  few sample notes, even after reducing
> hammerstoke by 1/4 inch, and their hammers STILL
> bobbled!
>     And to Roger Jolly: Are you sure this is "Ecsaine"
> on these butts? I've never seen "Ecsaine", but this
> looks awfully "buckskinish" to me ? In any event,
> there seems to be an undue amount of compression in
> this material, which is now "telegraphing" the angle
> the butted ends of of the two felt pieces beneath it
> creates. It is this rather acute angle which the
> rather acute front corner of the jacks do not seem to
> be able to negotiate. So the jacks get stalled there,
> and the butts bounce on them.
>    I am beginning to think that this is the
> accumulation of several manufacturing/design
> oversights,  rather than one in particular. And I am
> certain that Yamaha would like to hear about it.
>
>      Thanks!
>      Gordon
>
>
> P.S. What is Yamaha's #, if you please?
>
>
> 	
> 		
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