Baldwin accu-hitch pins

[Carl Meyer]

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Dale,  I'm trying to set bearing on a modified Emerson.  Modified for =
accujust hitch pins.

>From a friend I borrowed the Balwin instructions.

Briefly:::   Without bass strings installed, string treble and set =
bearing to (zero) with strings at pitch.  No load on board. =20
Now set specified number of notes starting at bottom to 1 div (.5 =
degrees). Number of notes depending on model of piano.  Then next group =
of notes to 2 div (1 degree).  Then the last group to 3 div (1 1/2 =
degrees).  Lastly install the bass strings and set at pitch to 1 div (.5 =
degrees).

Then I see a note saying -Quote-

A bearing value, previously set, cannot be rechecked because the =
accumulated force of all strings on the bridge will lower the soundboard =
and reduce the settings which were originally set.

Pianos equipped with the vertical (acu-just) hitch pins are designed to =
function with a minimum positive bearing at the bridges, compared with =
other pianos with string rests and angled hitch pins.    Unquote!!

Now if I designed something that had to be adjusted and then couldn't be =
checked, I wouldn't admit it.  Just how do you design a piano to not =
need much bearing?  Sounds too much like advertising garbage mouth to =
me.  Like,  "Our piano is so dam good that we don't need so much =
stinkin' down bearing."

I'm impressed with the idea, but I'm amused at the rhetoric.

I haven't felt too spunky the last few days so I'm still adjusting the =
bearing on this Emerson.  I've noticed that when I started I found some =
bearing with a regular rocker gauge, but no bearing with either the =
Lowell gauge or the Baldwin gauge. Both are a pain to use.  I want to =
look into that.  When I get it fingered out, then you'll all get the =
finger. Grin.=20


  ----- Original Message -----=20
  From: Erwinspiano@AOL.COM=20
  To: pianotech@ptg.org=20
  Sent: Saturday, January 19, 2002 2:07 PM
  Subject: Re: Baldwin accu-hitch pins


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



    Subj:Re: Baldwin accu-hitch pins=20
    Date:1/19/2002 11:23:14 AM Pacific Standard Time
    From:RNossaman@KSCABLE.com
    Reply-to:pianotech@ptg.org
    To:pianotech@ptg.org
    Sent from the Internet=20




    >
    >  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
    >       =20
    >        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.=20

  Ron
     Once again how could a person possibly know what the final position =
is?


  Does that make sense? =20
       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.=20
     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!!!!!!!
            =20
                       Dale Erwin



    Ron N




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