[CAUT] Baldwin sustain pedal return spring

[McNeilTom at aol.com]

In a message dated 9/22/2006 11:49:01 A.M. Eastern Standard Time,  
ilvey at sbcglobal.net writes:

I have  mentioned this before but would be the problem with adding some key 
leads to  the lever instead of a spring? 


Hi, David, and Colleagues -
 
The difference between spring and lead is 'mass'.  Add lead, you add  mass 
and increase inertia.  This can actually slow down the movement of  parts in 
some circumstances.  Consider that a part like a trapwork  lever must accelerate 
four times in one cycle of action.  (Remember  that deceleration is merely 
negative acceleratiion.)  Springs add  negligible mass, and can provide more (or 
less) acceleration than the one 'g'  provided by gravity working on the lead.
 
Best regards,  

 ~  Tom McNeil, RPT  ~
Vermont Piano  Restorations


346 Camp Street
Barre, VT  05641
(802) 476-7072

-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/caut.php/attachments/20060922/8ab2ab00/attachment.html