Baldwin accu-hitch pins

[Erwinspiano@AOL.COM]

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In a message dated 1/19/2002 11:23:14 AM Pacific Standard Time, 
RNossaman@KSCABLE.com writes:


> Subj:Re: Baldwin accu-hitch pins 
> Date:1/19/2002 11:23:14 AM Pacific Standard Time
> From:<A HREF="mailto:RNossaman@KSCABLE.com">RNossaman@KSCABLE.com</A>
> Reply-to:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
> To:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
> Sent from the Internet 
> 
> 
> 
> 
> >
> >  Ron (somebody) tell me what I'm missing on the acujust in a way I can 
> absorb
> > it. What's that you say? not possible. hmmmmmmm
> >        
> >        Dale Erwin
> 
> 
> Dale,
> I'm not sure what the question is here. Like you have adjusted plate height 
> to
> fine tune bearing, you can do the same thing section by section, or note by
> note with the hitch pin adjustment. Your initial plate height is determined
> just like you would normally do it, only your back scale target isn't the 
> top
> of an aliquot, but a vertical position on the hitch.

 Hi Ron
  Ok I get this sort of but the place where I'm hung up is that as you start 
driving the strings down on the hitch your bearing increases as does the 
amount the board is compressing as you go. Just like in pitch raising. So how 
do you know when enough is enough and when do you know that there is enough 
,of the desired deflections so often discussed. Meaning a 1 to 11/2 degree 
angle of deflection depending where in the scale we are talking about.
 Dale
 If you shoot for somewher
> around 4mm up the hitch as a target, you have some room for final vertical
> positioning as you find necessary. 
Ron
   Once again how could a person possibly know what the final position is?


Does that make sense?  
     Ron

     Uhhh not yet Ron.  I must be coming at this from a really strange angle 
of comprehension. I took Stacy Yokums class in Reno and he couldn't answer my 
question either. I wasn't the only one asking it either.
  Let me try another way by explaining where I'm coming from.
  Ok Take a new board and new set of too tall bridge caps. Install plate and 
cut the tops so that without any load on the board you have a 1 degree angle 
of deflection in the lower tenor rising to 1& 1/2 degrees thru the tenor 
right  up to note 88. Now install all the strings from the tenor /bass break 
to 1st capo section at. Tune these up to pitch. Before you string further 
take a bearing string and check the remaining deflection. Meaning once again 
that the soundboard is sinking under down bearing pressure as we go. If done 
this way I can guarantee an insuffiecnt amount of bearing to drive the treble 
in your shiny new board. The bearing string will probably touch bridge and 
aliqot at the same time or almost but that isn't enough bearing for trebles.
    In fact I you can't even read much deflection with the string at all. 
Unfortunately this is the very method Nick Gravagne outlined in the journal 
many years ago and it doesn't work unless you pre- stress the board some. He 
didn't correct or I should say amend it and I only found out he was using pre 
stressing and the 1 1/2 degree angle of deflection in one of my conversations 
with him a year or so ago.
     MY point oh yes is how in the acujust system does one approximate total 
and adequate deflection with any confidence that your not creating the 
problem I described above. 
   My answer so far is that you can't. Its more of a guesstimate than I'm 
willing to make until somebody can give me some clarification.
  Does this help to see my angle of deflection!!!!!!!
           
                     Dale Erwin

> 
> Ron N


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