Low damper lever lift ratio question

[William R. Monroe]

Dave,

How far do the felts sit below the strings at rest?  I generally do not like
the felt to extend past the strings at all.  So many new pianos are this
way, but I take no issue with trimming a brand new damper.  Very often,
trimming this felt will solve problems like yours, as well as eliminating
extra noise as the damper lifts from the strings.

I use a VERY sharp pair of non-serrated hair-cutting shears for monochords
and trichords, and a VERY sharp pair of Dress making shears (Big things) for
the bi-chord felts.  I pull the action, mark the felts at rest from under
the strings as a guide, block up the tray, and take the dampers out and
trim.  Works wonders.

William R. Monroe
Madison, WI
Assoc.




----- Original Message ----- 
From: "David Renaud" <drjazzca@yahoo.ca>
To: <pianotech@ptg.org>
Sent: Saturday, September 25, 2004 10:05 AM
Subject: Low damper lever lift ratio question


>
>    I just rebuilt an old Knabe, 1920s, for a client.
> It had a strike ratio of 6.5...thus light hammers.
> The damper lever pinning is far back enough that they
> lift little relative to the key stroke.
>
>    If I adjust the lever lift is at one third blow
> distance, the tip of the wedge bicord dampers do not
> quite clear the string. The hammer approaches the
> within 2 mm and touches them interfering with ppp
> playing. I must adjust the dampers to lift immediately
> with the keystroke for them to clear.
>
>    I presume I shall end up trimming the tips of the
> bicord with a razor blade, but thought I would post
> this here, as it is something I have not run across
> before. Any additional ideas welcome.
>
>    .....And yes the damper lift felt is good and firm.
>    It truly is a very low damper lever ratio.
>    ....is that a new term...... it is to me.
>
>
>                                 Cheers
>                                 Dave Renaud
>
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