Tonebell

[Erwinspiano@aol.com]

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In a message dated 10/20/2003 6:58:36 AM Pacific Daylight Time, 
pianobuilders@olynet.com writes:


 Dale wrote
  The bell is just a plate stiffening device. A short beam from the belly 
rail to the case in the same area would allow for another nose bolt that could 
take the place of the bell. I cant say the bell has any effect in and of itself 
to influence tone but does stiffen the plate web where it attaches thereby 
influencing tone. There must be a modest down force of the bell bolt to do so 
which by the way will increase the downbearing a small amount (tone effect) These 
bolts also seem to come loose from time to time and cause a weird rattle.

Take the coupling bolt out of a D sometime and listen to what happens to 
sustain through that area.

 Del
         Del
        I took your suggestion out of curiosity today.  I have an almost 
completed D in the shop which by now I know intimately in the tonal sense. I 
listened carefully to octave 6 & then disconnected the bell bolt. Honestly it was 
difficult to say there was any desernable change. However when I put it back in 
I decided to tighten it a bit more & the sustain though slight increased on a 
few notes primarily C-6 ,thru D sharp 6. It was so slight that I cant imagine 
a beam and nosebolt wouldn't have the same effect. For all its touted 
features I'm questioning its benefits not to mention the torque it puts on the rim 
where some separation is often seen.  Know what I mean? 
  Dale

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