an analysis of downbearing, etc.

Richard Brekne Richard.Brekne@grieg.uib.no
Sun, 15 Feb 2004 10:32:29 +0100


I've certainly heard this claim, or essentially the same, made on many 
many an occasion. I dont think anyone has actually proven the point... 
but on paper, taking along a few assumptions... seems a viable enough claim.

Cheers
RicB

David Skolnik wrote:

> List-
> 
> In rereading the posts from the recent downbearing thread, I noticed 
> these two statements by Mark Kinsler.
> 
> At 08:28 AM 2/2/2004 -0500, you wrote:
> 
>> Could the sounding board have a negative crown (like a dish), and the 
>> downbearing be "upbearing?" From a physical standpoint, yes.  There 
>> would be no difference in the behavior of the system, though the 
>> bridge would peel off the sounding board pretty quickly and the design 
>> of the bridge pins would be interesting.
>>
>> Or, in another possible configuration, could the sounding board have a 
>> negative crown and the downbearing still exert force downward?  Again 
>> yes.
>> (The bridge would have to be rather high.)  The sounding board's wood 
>> would be in tension and the rim of the sounding board would tend to be 
>> pulled away from the frame, but again from a purely physical 
>> standpoint the system would work about like a normal piano.  
>> Structurally, of course, this configuration would be a disaster, but 
>> the sounding board and strings would behave pretty much normally if 
>> the whole works didn't peel apart.
>>
>> Mark Kinsler
> 
> 
> Is there general agreement that these statements are correct?  I myself 
> find it hard to reconcile.
> 
> 
> David Skolnik
> 
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives
> 


This PTG archive page provided courtesy of Moy Piano Service, LLC