Dynamic Lost Motion in Vertical

[Delwin D Fandrich]

----- 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