Restringing

[David ilvedson]

As a designer what would you want in a capo bar if you even 
wanted one?

David I.

From:           	"Delwin D Fandrich" <pianobuilders@olynet.com>
To:             	<pianotech@ptg.org>
Subject:        	Re: Restringing
Date sent:      	Sat, 12 Feb 2000 12:25:19 -0800
Send reply to:  	pianotech@ptg.org

> 
> ----- Original Message -----
> From: Richard Brekne <richardb@c2i.net>
> To: <pianotech@ptg.org>
> Sent: February 12, 2000 10:58 AM
> Subject: Re: Restringing
> 
> 
> >
> >
> > David ilvedson wrote:
> >
> > > I would tend to go with what was designed in the piano.
> > > Emory cloth will make the smallest change.  We don't want to
> > > flatten it out though.  String grooves usually not very deep.  It
> > > seems to me that a sharper capo means less surface area to
> > > take the pressure of the string and possibly more cutting into
> > > the capo.
> > >
> >
> > Thats true... but thats only part of the picture, the two different
> profiles have
> > different and very measurable affects on the amount of inharmonicity, and
> depending on
> > the scale tension, and the hardness of the iron, the effect of one can be
> more
> > desireable both from an acoustic point of view and from a wear and tear
> point of view.
> > You also have such things as the length of the front duplex, the angle the
> string has
> > from the capo up to the ubar or whatever is employed.
> >
> > All in all I tend to agree that its best to go with what the designer /
> builder started
> > with. Sometimes that means a nearly flat top (bottom) on the capo and a
> very thin
> > surface area. 0,5 mm is given most often in these cases.
> >
> --------------------------------------------------------
> 
> I might point out that you are both making the assumption that what you see
> on the piano is what the designer intended.  This is, of course, not always
> the case.  The V-bar profile that ends up in the piano is usually what the
> foundry workers put on it.  Or the plate grinders in the piano factory.  It
> may or may not bear any resemblance to what the designer intended.  All too
> frequently it does not.
> 
> Del
> 
> 


David Ilvedson, RPT
Pacifica, CA
ilvey@jps.net