RC&S question in general Kent

[Dean May]

Hello newbie!

 

Not unfounded attacks, vigorous discussions. The list remains amazingly
civil considering the number of highly intelligent and opinionated people
that it contains. Piano technicians after all can be among the most anal
retentive obsessive compulsive of anyone you'll ever meet. And most of them
on this list are amazingly nice people, too! 

 

Jump in, the water's fine. ;-)

 

Dean

Dean May             cell 812.239.3359 

PianoRebuilders.com   812.235.5272 

Terre Haute IN  47802

 

  _____  

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of AlliedPianoCraft
Sent: Monday, January 28, 2008 5:48 PM
To: Pianotech List
Subject: Re: RC&S question in general Kent

 

Ric, well said. You are a gentleman. I'm new to this list and I can't
believe all the unfounded attacks going on here.

 

Al Guecia
Allied PianoCraft
PO Box 1549
High Point, NC 27261
(336) 454-2000
 <mailto:PianoTech at alliedpianocraft.com> PianoTech at alliedpianocraft.com
 <http://www.alliedpianocraft.com> www.alliedpianocraft.com

 

 

----- Original Message ----- 

From: "Richard Brekne" < <mailto:ricb at pianostemmer.no> ricb at pianostemmer.no>

To: < <mailto:pianotech at ptg.org> pianotech at ptg.org>

Sent: Monday, January 28, 2008 5:12 PM

Subject: RC&S question in general Kent

 

> Hi Kent   
> 
>    Your "bold faced fact" appears to be an opinion to me, an opinion
>    based on your analysis of the available data and evidence. Others
>    looking at the same data and evidence, myself included, might reach
>    a different opinion.
> 
>    Kent Swafford
> 
> Of course we all have the right to draw whatever conclusions we want.  
> But  lets back off from unnecessary extreme positions. These discussions 
> are supposed to enlighten us about how different  approaches function.  
> The whole... <<which is better>> thing is nothing more then a 
> destructive side track.  Who is discouraging who in all this ?   
> Disputing the validity of RC and CC methods is no more productive then 
> some of the discussion tactics just used... or throwing out presumably 
> lightly meant death threats. How does any of this answer any of the 
> questions on the table or provide deeper understanding into the various 
> methods different builders use and have used to build the instrument we 
> all love and have devoted our lives to servicing ? 
> 
> Take this residual crown bit as an example. The query was clearly 
> qualified as including two other known states... Rib dimensions and 
> amount of panel compression at glue up MC. Before going on please let me 
> point you to the following very short post from Ron Nossaman.
> 
>     <http://ptg.org/pipermail/pianotech.php/2008-January/216274.html>
http://ptg.org/pipermail/pianotech.php/2008-January/216274.html
> 
> So I asked...given the aforementioned qualifying conditions  how much 
> compression a given downbearing will impart into the soundboard for a 
> given deflection... ie. for what ever target residual crown there is 
> after downbearing is applied. The post I just directed you to clearly 
> conflicts with the flurry of responses I got declaring that residual 
> crown is meaningless.  Despite going out of my way to re-underline the 
> conditions I set... which are perfectly inline with Rons post I linked 
> to above... I got the usual ration. Grin... and on top of that.. there 
> are actually exacting predetermined amounts of this same residual crown 
> calculated on when designing and RC&S board for any given scale. Its 
> nearly half of the whole design approach !
> 
> Now where is the constructive learning spirit in all this ? What ends 
> are served ?
> 
> I'd restate my question... but it seems like really no one knows how to 
> figure how much compression is imparted to a panel for a given 
> downbearing with known starting values for rib strength and orientation 
> and panel compression for a constant RH.    And if THAT be the case... 
> then how on earth can we be certain of just how much compression is in 
> an RC&S panel when loaded ? Those ribs are stiff suckers... downbearing 
> forces compression in the panel as it strains against the ribs.... its a 
> fair question.
> 
> Why don't we drop all this judgmental stuff and get down to what this 
> list is supposed to be about.  I'm just asking questions I want straight 
> and respectful answers too.  Is that such a problem ?
> 
> Cheers
> RicB
> 
> 
>    On Jan 28, 2008 1:55 AM, Richard Brekne <ricb at pianostemmer.no>
wrote:
> 
>     The fact is...and this is a bold faced fact... that experienced
>    manufacturers have been building boards of all types for 300
>    years... and there is no statistical grounds for doubting  the
>    viability of any of the basic methods employed (when done so
>    appropriately) today .
> 
>

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