Facts and nots : was Recommend Rebuilder?

[John Ross]

Speaking of compression boards.
What I can't comprehend, is the fact that compression ridges, are apparently 
ok, by some.
How can they figure out the crown?
Do they know how much of a compression ridge there is going to be, and allow 
for it?
This seems to me to be impossible.
Or is there something, I am missing?
John M. Ross
Windsor, Nova Scotia, Canada
jrpiano at win.eastlink.ca
----- Original Message ----- 
From: "RicB" <ricb at pianostemmer.no>
To: <pianotech at ptg.org>
Sent: Friday, March 23, 2007 5:11 PM
Subject: Facts and nots : was Recommend Rebuilder?


> Evidently you can... I think he mean Yamaha.  And I remember both times I 
> was at the Academy asking several folks about the question of how much 
> they dried out their soundboards before attaching ribs and the answer was 
> I believe 3.5 %.... I'll have to check the archives for a post on that I 
> made with a fresher memory of the Masters course... but I think 3.5 % was 
> the figure they gave me.  I asked also if they knew what Kawai did and 
> couldnt get an answer.
>
> This is one of the problems I see with the huge point made by many against 
> compression boards.  All kinds of pianos are produced this way... and when 
> I step back and try as objectively see how they hold up over time.... I 
> just dont see that the degree criticisms are levied are justified.  That 
> by no means implies I dont like the results some of the other methods 
> mentioned.  In fact it says nothing at all about what I think of other 
> methods.  But if anyone is in doubt I think I am on record time and time 
> again expressing very high enthusiasm for those RC&S, RC and laminated 
> board based pianos displayed at PTG conventions by various list 
> contributers.
>
> Heck.. what can I say.. I like pianos.. and dont have a major problem with 
> how you build them, as long as you do good work. And noooooo--- I wont 
> bite on a further definition of what good work implies... I really dont 
> think I need to.
>
> Cheers
> RicB
>
>
>    Can you even get a glue joint to bond when the wood MC is 3%?
>
>    What is YA?
>
>    Terry Farrell
>