[pianotech] Baldwin grand repetition spings

[Barbara Richmond]

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 

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