M H A

[Carl Meyer]

Thanks to Del and others for the info on the "A".  I stand reminded of the 
importance of the effect of a flexible cantilever.  I was too fixated on 
that note #1 and its short back scale to notice.  I suspect the benefit of 
lessening the shelf would be added to the benefit of lengthening the back 
scale.

The more I learn about that cantilever the more I realize what a bad idea it 
was just to be able to advertise a longer speaking length.  I can visualize 
the string putting a pulse of energy to the bridge and even if the skirt 
were infinitely inflexible, it would induce a ripple to the soundboard (the 
board IS flexible).  I'm just speculating but it seems that would produce a 
harmonic rather than a fundamental.  Energy would not move the board up and 
down but in a crack the whip fashion.  Sound reasonable?

Del, you mentioned using double loop terminations.  Would you use those on 
vertical hitch pins?  My sense is that the standard bass string loop would 
pivot on the pin better than the double loop.  Having two loops contacting 
the roll pin would make it harder to pivot.  The twist of the standard loop 
adds stiffness but may not be detrimental.

I'm not sure if I could detect the subtle difference in sound under these 
improvements.  Any hints as what to listen for before and after?

Any ideas how best to remove the bridge and did you remove the excess skirt. 
That could affect mass I suppose.

Thanks to all.

Carl Meyer PTG assoc
Santa Clara, Ca.



----- Original Message ----- 
From: "Delwin D Fandrich" <fandrich@pianobuilders.com>
To: "'Pianotech'" <pianotech@ptg.org>
Sent: Thursday, January 05, 2006 7:50 PM
Subject: RE: M H A


>
> There are several other pictures but this one shows the finished product. 
> The
> 150 mm rule is just there to let you see what the backscale length is. 
> It's
> approximately 75 mm as shown. It started out at about 45 mm. This was done
> without modifying the plate or remounting the bass bridge foot on the
> soundboard. It was an easy modification that didn't take a whole lot of 
> time
> and, to the inexperienced eye, still looks original. It does, of course, 
> require
> a custom set of bass strings.
>
> Del
>
> | -----Original Message-----
> | From: pianotech-bounces@ptg.org
> | [mailto:pianotech-bounces@ptg.org] On Behalf Of Carl Meyer
> | Sent: January 05, 2006 4:47 PM
> | To: Pianotech
> | Subject: Re: M H A
> |
> | Thanks Del.  I'm encouraged.  Your picture looks just like
> | mine except the stringing braid is routed different.  And
> | there is a 6 inch rule showing.
> | Am I missing something or is there additional pictures?
> |
> | Carl Meyer PTG assoc
> | Santa Clara, Ca.
> |
>
>
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