MH BB Pinblock

[David Love]

OK.  On these particular instruments, the plate as attached to the stretcher
via several screws that run between the plate and the stretcher along the
length of the plate on that side.  Do you think that attaching the entire
length of the block itself to the stretcher adds any significant resistance
to vertical movement?

David Love
davidlovepianos at comcast.net 
www.davidlovepianos.com

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of A440A at aol.com
Sent: Saturday, August 02, 2008 7:31 AM
To: pianotech at ptg.org
Subject: Re: MH BB Pinblock

 David writes:

<< pinblock is screwed to the inner rim via a couple of plate screws that
penetrate the block down to the rim) all the way to the stretcher why would
you need to attach the pinblock to the stretcher to create case stability.

>>

I don't think it is a question of case stability, but rather, stiffness in 
the plate/block assembly.  
    The attachment of the block to the stretcher assists the block in 
resisting  movment of the strings in the vertical plane.  These vibrations
are quite 
small, but I consider them important, and without some vertical component to

the "beam" that resists them, more energy is lost to heat than otherwise
would 
be.   
   It could be that the increased stiffness afforded by attaching the block 
to the stretcher would also increase the entrainment of the strings'
vibration 
to the case.  
Regards,
 
Ed Foote RPT 
http://www.uk-piano.org/edfoote/index.html
www.uk-piano.org/edfoote/well_tempered_piano.html
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