Touch weight

Mark Bolsius markbolsius@optusnet.com.au
Thu, 04 Mar 1999 21:10:27 +1100


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Rogerio, Bill, Brian and list,
Your all on the right track, Bill Spurlock sells an info sheet relating to
touchweight that is very practical. remember you only have to have removed =
2
or so grams from the hammer to acheive the desired effect depending on the
leverage ratio of the action.
Check the lead weights in the keys, if there are none or only a couple, the=
n
weights could be part of your answer....but easy does it as Brian and Bill
have already said.
10g is not much to get rid of, have you done everything to reduce friction?
Teflon pwder on the knuckles, let-off buttons, whippen heels and key
bushings can go a long way. Protek on ALL centre pins in the hammer and
whippen and teflon or graphite (I use a 4B pencil) at the contact between
the repetition spring and the repetition lever.
You don't mention the upweight, so I can't comment much more on friction.
Cheers
Mark Bolsius
----------
From: "Rogerio Cunha" <rogeriocunha@openlink.com.br>
To: "Pianotech Mensagem" <pianotech@ptg.org>
Subject: Touch weight
Date: Thu, 4 Mar 1999 7:56 AM
To the list
I am just working on a grand ( B=F6sendorfer ) and on it I applied new hammer=
s
( original ) , new center pins, and others items as knuckles, etc, etc,
All the material applied is original and all the work was made with care an=
d
the final product was very, very good except the touch weight.
I did all that I learned and read but wasn't possible to obtain 52 g on the
1st section, 50 g on the 2nd section and 48 g on the 3rd and 4th section an=
d
this is the problem that I want to know. ( these are manufacturer
measurements)
The difference is about +10 g on each section.
What to do?
I think that the only way would be to put leads on the keys. Is this
correct?
To use the piano with + 10g of touch weight is good?
If isn't possible to obtain the manufacturer measurements what are the good
touch weight?
I thanks to all
ROGERIO CUNHA - IC MEMBER OF THE GUILD
 

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