----- Original Message ----- From: "Farrell" <mfarrel2@tampabay.rr.com> To: <pianotech@ptg.org> Sent: March 18, 2002 7:06 PM Subject: Dynamic Lost Motion in Vertical > Time to change the subject title! > > Richard asked in response to Del's post: "Thats interesting, can you point me to reading about your action and dynamic lost motion?" > > I am familiar with the lost motion adjustment of the capstan in a vertcal action, but I suspect your dynamic lost motion is quite something else. I have not heard this term before. Can you describe this? Thanks. > > Terry Farrell The lost motion--the gap--between the tip of the jack and the knuckle of the hammer butt while the piano is being played. In the vertical action there can be quite a lot of space between the two as the various parts bounce around. Then, when the repeated note is played the key and wippen must take up that space before contact is made and, once contact is made more bouncing takes place. Darrell's action development largely eliminated that component of lost motion. It was/is a very precise action. When properly regulated it is easily capable of exceeding the dynamic range of the grand action; mostly because it could be played more softly still with good control. Del
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