new Hamilton

[Allen Wright]

Jurgen,

I love your potato chip analogy. I had never thought of the moisture  
angle with paper punchings before (only considered compression), but  
it makes perfect sense. You are, clearly the Professor of  
Punchings  : ) I look forward to trying the Forte punchings.

Thanks for your insights.

Allen Wright, RPT
On 27 Feb 2007, at 05:01, Jurgen Goering wrote:

> It is not so much about the paper fibers compressing.  The reality  
> is that paper is quite hygroscopic, just like wood, perhaps even  
> more so.  It draws in ambient moisture, expands, gives it off again  
> and shrinks.  Repeated cycles lead to warping.  If you have a stack  
> of thin punchings, after a while they will not lay flat any more,  
> they will be like a  vertical stack of potato chips.  Not quite  
> that bad, of course, but the same idea.  You can observe that they  
> do not create a solid stack, there are air gaps that develop  
> between the layers. The result: unstable regulation --> keys out of  
> level and varying key height (bal. rail),  imprecise dip and  
> aftertouch, as well as that mushy feeling when they compress under  
> pressure.
> I will not go through an action and replace two .010  with a .020.   
> But if I want to add more paper, I will do that.  When I am  
> touching up dip or key level, I like to take out more punchings  
> than I put in.
>
> Jurgen Goering
> Piano Forte Supply
> (250) 754-2440
> info at pianofortesupply.com
> http://www.pianofortesupply.com
>
>
> On Feb 26, 2007, at 20:12, JF wrote:
>> I can see the benefit of having fewer of the very thin ones, and  
>> can see where they might contribute to a spongy feel. What about  
>> the point of diminishing returns, though? Are you really going to  
>> take out two 0.010punchings and replace them with one 0.020?  
>> Honestly, now, how much can those paper fibers really compress?   
>> Gotta be some reality here...no?


-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20070227/72e4411a/attachment.html