stretching wire

[David Andersen]

Thanks, Dean. Great post. Calming.
xoDA

On Apr 9, 2008, at 3:20 PM, Dean May wrote:

>>> It's the best evidence I could find out there among real
> engineering sources.
>
>
> Well here is one engineering source that is definitely not the final
> authority, but I do have a mechanical engineering degree, BSME, and  
> I am a
> PE (Professional Engineer license). I am not aware of any steel  
> wire that
> has the kind of elasticity you are talking about (if I understood  
> what you
> have been saying). All of it will take some permanent set after  
> being put
> under tension and released, and all of it will creep when placed under
> tension. Now it does reach a place where the amount of creep  
> exponentially
> approaches zero as the tension is maintained (i.e., the elastic  
> deformation
> (slack) is removed). Combine this with the soundboard becoming  
> settled and
> all the bend areas of the wire being set and you have tuning  
> stability.
>
>>> But then I'd be at a loss as to why low panel compression rib
>> supported soundboards with laminated bridge caps stay in tune
>> so much better than traditionally built panel supported boards
>> with solid caps, using the same ever stretching wire. And no,
>> that's not my wild hair notion either, but is reported by
>> techs I've done belly work for.
>
> No reason to be at a loss: the wire has reached a point where creep is
> negligible, and your boards are more stable than others. End result is
> better tuning stability. This does not prove by any stretch (no pun
> intended) that the initial creep did not happen.
>
> Dean
>
> Dean May             cell 812.239.3359
>
> PianoRebuilders.com   812.235.5272
>
> Terre Haute IN  47802
>
>
>
>
> -----Original Message-----
> From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org]  
> On Behalf
> Of Ron Nossaman
> Sent: Wednesday, April 09, 2008 4:44 PM
> To: Pianotech List
> Subject: Re: stretching wire
>
>
>> The fact is you simply can't bear to have facts demonstrated to  
>> you that
>> aren't written ad nauseam in the Gospel according Ron Nossaman and  
>> that
>> any serious scientific data is beyond your powers of understanding.
>
> Sorry John. This isn't some wild hair notion I cooked up on my
> own. It's the best evidence I could find out there among real
> engineering sources. This doesn't have my ego wrapped up in it
> anywhere. As I have said repeatedly, if you have an
> authoritative source that says modern music wire stretches in
> the long term under the conditions found in real pianos, I'd
> love to see it. It would make life so much easier to be able
> to blame the wire for everything.
>
> But then I'd be at a loss as to why low panel compression rib
> supported soundboards with laminated bridge caps stay in tune
> so much better than traditionally built panel supported boards
> with solid caps, using the same ever stretching wire. And no,
> that's not my wild hair notion either, but is reported by
> techs I've done belly work for.
>
>
>> In the patent I suggested you look at, published in 1985,
> what sort of wire do you think they were dealing with, for
> heavens' sake?!  Of course you did not read it.
>
> Apparently not, but then patents have been issued for
> perpetual motion machines, which might cast some doubt as to
> it's being a credible information source. I'll wait for the
> diversionary chaff to clear and see if a real echo appears on
> the screen.
>
> Ron N
>