[pianotech] Baldwin grand repetition spings

[Paul T Williams]

That makes perfect sense, Barabara.

Thanks
Paul




From:
Barbara Richmond <piano57 at comcast.net>
To:
pianotech at ptg.org
Date:
09/06/2011 10:19 AM
Subject:
Re: [pianotech] Baldwin grand repetition spings



Hi Paul,

It changes the fulcrum--like in a teeter-totter--it lengthens the front of 
the key so it can pick up a heavier load.

David Love has written a whole bunch of wonder posts (with pictures) on 
this list and on the myptg touchweight list

Bye for now....

Barbara

From: "Paul T Williams" <pwilliams4 at unlnotes.unl.edu>
To: pianotech at ptg.org
Sent: Tuesday, September 6, 2011 9:18:33 AM
Subject: Re: [pianotech] Baldwin grand repetition spings

Hi Barbara, 

I've read for many years about the half punching or veneer trick, but 
never have tried it.  What is the physics to this to lower the DW? I'm 
trying to wrap my pea-brain around this and want to try it on a very heavy 
Petrof grand. 

Thanks 
Paul 



From: 
Barbara Richmond <piano57 at comcast.net> 
To: 
pianotech at ptg.org 
Date: 
09/06/2011 09:12 AM 
Subject: 
Re: [pianotech] Baldwin grand repetition spings




Hi Doug,

What are the upweights?  You can get the Stanwood Touch Design Kit at 
Pianotek and find out where the real problem is--hammer/strike weight, 
knuckle mounting distance, capstan placement, front weights, etc.  On this 
list or the touch-weight list on my.ptg.org, we've discussed the use of a 
half punching at the balance rail to take 4-5 grams off the DW (or a strip 
of veneer mounted behind the balance rail pins).  It's fun--when you get 
the hang of it.

Barbara Richmond, RPT
near Peoria, Illinois

From: "Douglas Gregg" <classicpianodoc at gmail.com>
To: pianotech at ptg.org
Sent: Tuesday, September 6, 2011 8:57:29 AM
Subject: [pianotech] Baldwin grand repetition spings

I am working on a school Baldwin 5" 8" BG from 1929 that was restored
by someone else about 5 years ago. Restored is a stretch, but they put
in a lot of new parts. New action, hammers, dampers, keycovers, bass
strings, and refinished the plate. Lots of parts but no adjustments.
No voicing or regulation was done.

I have it regulated now but the action is heavy, about 65 to 70 grams
down weight throughout. I am thinking that part of it might be due to
the repetition spring tension. This has one spring attached under the
repetition lever with the other end pushing down on the back of the
jack. To get the repetition lever to bump the hammer up slightly, it
puts quite a bit of spring pressure on the back of the jack. This
might be contributing to the heavyness. My question is if this is
likely and if there is some way around this. If I reduce the spring
pressure on the jack, it will sacrifice the repetition lever strength.
Any suggestions.

Perhaps it could be cured with a Touch Rail, but this is not a big budget 
job.

Doug Gregg
Classic Piano Doc 


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