Pinning and Tone -- again!

[Otto Keyes]

We'll try this again.

> 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
> the ....Continuing on.......gram readings will begin increase
exponentially.  However, that may be in a range beyond the scope of this
experiment.

Otto


> ----- 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
>