RACHALS

[Paul McCloud]

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I vote for reshaping the tails.  I had a similar problem with some
Chinese Young Chang grands.  The arc on the tails weren't made properly
(too small radius).   The tails had a "hump" instead of a smooth arc.
The backchecks would hang up on the tail with a hard blow.  Bending the
backcheck wire farther away (to avoid touching the hammer on it's way
up) only makes the hammer check too far from the string.   

Paul McCloud

San Diego

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of Dave Bunch
Sent: Wednesday, March 26, 2003 3:56 PM
To: Pianotech
Subject: Re: RACHALS

 

I agree with James. Instead of lowering the rail, you should have raised
the hammers. The lower the hammers sink over time, the more likely they
are to catch on the back check on a hard blow. When the key is played
sharply, the back checks that are regulated a little closer than some
others will get out ahead of the hammer a bit and catches it on the way
up.

 

After raising the hammers I would also check the regulation of the back
checks.

 

Dave Bunch

----- Original Message ----- 

From: Rogerio <mailto:rogerio.cunha@terra.com.br>  Cunha 

To: Pianotech Mensagem <mailto:pianotech@ptg.org>  

Sent: Wednesday, March 26, 2003 1:23 PM

Subject: RACHALS

 

To the list

 

Today I went to solve a problem on a RACHALS grand.

The piano was very well restored in England and now is on Rio de
Janeiro.

All on it was very nice and the only wrong thing was the hammer shanks
that  was resting on the hammer rest rail. I lowered the rail.

There are on it a problem that I could not to solve. If you play normaly
it is a very good piano and a very nice one but in some notes if you
need to use a heavy blow, the hammer don't go to the strings. The hammer
stays blocked on the backcheck. I separate the back check from the tail
of the hammer and this don't solved the problem. 

I made a accurate inspection in 3 or 4 notes with this problem, and I
could not to discover what is wrong.

I need help.

Thanks

ROGERIO CUNHA
IC Member of The Piano Technicians Guild
Rio de Janeiro - Brasil
http://planeta.terra.com.br/arte/dacapo/
http://www.perfectpitch.hpg.ig.com.br/index.html

 

 


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