verrry interesting!! :-)

[Farrell]

I was cutting out the treble section of an old Starr plate the other day. I cut it by drilling many closely spaced 3/8" or so holes. When I was nearly done drilling what I thought might be enough holes "CRACK!". The whole area below where the bridge had been cracked on its own and ended up with a visible crack. Obviously there had been quite a bit of stored tension in the plate.

Terry Farrell
  
----- Original Message ----- 
From: <JIMRPT@aol.com>
To: <pianotech@ptg.org>
Sent: Wednesday, March 05, 2003 10:29 PM
Subject: verrry interesting!! :-)


> We have often spoken of plate stress and how it is transferred to other 
> sections/notes as a string(s) broke or were loosened. I have never seen a 
> better example than the little Apollo grand I am removing the strings 
> from.......
> The bass strings are out and I was in the process of removing tension from 
> the tenor section.....when 'pong''' a string broke in the octave 5/6 
> section!! as I kept removing tension from the tenor, strings kept popping in 
> the 5/6 area...a total of six altogether
>  As I was relieving tension in the 5/6 area the strings in the top section 
> 6/7/8 starting breaking also !!
>  Now the strings that broke were all kinda really rusty and broke fairly 
> easily but I thought it was a perfect example of plate stress and stress 
> transferance............
> I have never had this happen to me before.
> 
> Jim Bryant (FL)
> p.s. the plate is a full perimeter plate.
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