CA gluing Grand Pinblocks....My take on it/ Richard Brekne

[Farrell]

Hi Richard. I woke up in the middle of the night realizing that I had way-over simplified things with my example. What I said would be true if the bottom of the bridge pin were anchored firmly and could not move at all - that way it would be the pivot point for the bridge pin wanting to tip over from string pressure. In real life this would not be true I suppose. There would likely be forces similar to a tuning pin where at some point below the surface of the bridge there is a fulcrum point where the bridge pin wants to teeter-totter the other way.

But let's not go there......way too early........and school was such a long time ago.........more coffee!

Terry Farrell
  
----- Original Message ----- 
From: "Richard Brekne" <Richard.Brekne@grieg.uib.no>
To: <pianotech@ptg.org>
Sent: Friday, August 02, 2002 4:54 AM
Subject: Re: CA gluing Grand Pinblocks....My take on it/ Richard Brekne


> Actually.... thats a perfect explaination Terry.  Says
> exactly what I was trying to say about there being pretty
> much the same situation glue or not, in a much clearer
> fashion then I was able to. 
> 
> The only question I have left then is how significant the
> changes are. They would seem very slight unless you really
> used a lot of glue. But ok. I got all this clear now.
> Thanks. 
> 
> But surely this isnt what Joe was refering to in his
> origional point about the shear stress on the pin from the
> string pushing against it and the bridge resisting. I cant
> see how that gets much directly into the question of bridge
> cracking... with or without CA.
> 
> 
> Cheers !
> RicB