Stainless Steel Wire

[Isaac OLEG]

Hello,

I understand the wire is a little heavier than Roslau wire.

Extract of the Pure sound site http://www.puresound-wire.com :

To measure a string tension I use a simplificated form derived from
the Taylor formula:

F = 2514 x f2 x l2 x d2

F = tension in kg (gravity 9.81).
f = frequency in Herz.
l = speaking length in meters.
d = diameter in meters (!)


This formula is based on modern piano wire, average density 7,85.
These data are all hidden within the number: 2514.
For Pure Sound wire this number is : 2530. (average density: 7,90)
For Malcolm Rose's wire the number is : 2488. (average density: 7,769)

Never hear of problems of string turning "dead" (but not much data for
me today.

There are many useful information about the different gauges used on
the site.

Regards.

Isaac OLEG

PianoTech
FRANCE
tel : 033 01 47 18 06 98
fax : 033 01 47 18 06 90
cell: 06 60 42 58 77


> -----Message d'origine-----
> De : owner-pianotech@ptg.org
> [mailto:owner-pianotech@ptg.org]De la part
> de Annelies Boddin
> Envoyé : lundi 22 juillet 2002 22:07
> À : pianotech@ptg.org
> Objet : Re: Stainless Steel Wire
>
>
> If I check with my calculations in the past: for the same
> gauge on the same
> speakinglenght the tension is about O,5 kilogram stronger
> for pure sound
> compared with Röslau. I don't know exactly  about the
> yieldingpointdifference.
> Also to ad that puresound gets better in sound ( even more clear and
> singing) after six months one year: Juan told me something
> is changing in
> the structure. Also the stability of the first pitchraises
> and final tuning
> are much better.
> I forgot, : heard a rumour from a friend in Poland that the
> sound was  dead
> after 5 years and the piano had to be restrung, did somebody already
> expierence this same dissaster with puresound?
> Friendly greetings,
> Danny Boddin , Ternat Belgium.
> ----- Original Message -----
> From: "Phillip Ford" <fordpiano@earthlink.net>
> To: <pianotech@ptg.org>
> Sent: Monday, July 22, 2002 7:55 PM
> Subject: RE: Stainless Steel Wire
>
>
> > >
> > > > > The wire is used mostly because of the less tension it
> > > needs , and because of the mellower sound it gives.
> > > > >
> > > >
> > > >Lowering tension with normal piano wire will have a "mellower
> > > >sound".  There may well be some difference but you
> cannot compare
> > the sound
> > > of two wires at different tension.  ALL parameters have to be as
> > close as possible to get a
> > > >valid comparison.
> > > >
> >
> > I don't understand why this stainless wire should require
> less tension.
> The
> > density and young's modulus of stainless steel should be
> very close to
> carbon
> > steel.  As I see it, if you want to lower tension when using this
> stainless
> > wire, assuming you are not changing speaking lengths,
> then you would have
> to
> > use a different gage than was originally there.  Making
> tone comparisons
> after
> > a change like this seems a dicey proposition.  You're
> comparing apples to
> > oranges.  Perhaps this is the same thing that Newton was
> saying.  If so,
> my
> > apologies for reiterating.
> >
> > Phil F
> >
> >
> >
> >
> > Phillip Ford
> > Piano Service & Restoration
> > 1777 Yosemite Ave - 215
> > San Francisco, CA  94124
> >
> >
>
>