Pinning and Tone

[Otto Keyes]

Remember that adjusting the screw on this flange will only give one a rough
"guess-timate" of the gram resistance.  Some experiments should be done to
determine the change made by specific adjustments.  My gut guess is that
they
----- Original Message -----
From: "Ed Sutton" <ed440@mindspring.com>
To: "College and University Technicians" <caut@ptg.org>
Sent: Wednesday, October 15, 2003 2:13 PM
Subject: Re: Pinning and Tone


> Fred wrote-
> >
> >    I'll just suggest here that use of the Stanwood flange might not
quite be the
> > same as re-pinning. In re-pinning, there is also a question of firmness
in the
> > interface between pin, felt and wood - where one is affecting the
dimension of
> > the felt (and largely by compression more than by removal of material,
if one is
> > doing what should normally be done) - more or less evenly around the
whole
> > circumference of the pin. I _think_ there might well be a difference.
The set
> > screws (I remember only one set screw, but could be mistaken) operate
from
> > only one direction (each). They could well increase friction, but allow
> > "sloppiness" in other directions.
> >    Friction per se would most likely affect only the dwell time of the
hammer on
> > the string. Firmness in isolation would have its greatest effect on the
wobble
> (or
> > lack of same) of the shank during the stroke and rebound, and hence on
what
> > the hammer is doing while in contact. I am picturing those high speed
films,
> > showing all kinds of vibration and flopping around of shank and hammer.
> >    As several have mentioned already, this is the sort of thing that is
next to
> > impossible to test with reliable experiments. Maybe we're best to rely
on what
> > our experience has at least seemed to demonstrate, together with our
mental
> > picture of why (though often the two are hard to reconcile).
> > Regards,
> > Fred Sturm
> > University of New Mexico
>
> Fred-
>
>     I agree with your assessment of the limitations of testing with the
"Stanwood
> flange," but I think it's a place to start.  The experiment would be
controlled
> for one variable, and the hammer alignment would not be changed.
>     If the experiment shows a different wave form, then great, something
has been
> experimentally confirmed.  If not, then everything else you said is still
true.
> Either way, we continue doing everything we can to make pianos sound
better.
>     I wish it were possible to get high speed films of the action at work
in the
> piano, but so far as I know that takes a very expensive lab set-up and is
done
> with action models, not real pianos.
>
> Jim Ellis-
>
>     If you want to do this, and want me to help, I would be honored!
>
> Ed Sutton
>
> _______________________________________________
> caut list info: https://www.moypiano.com/resources/#archives