Accu hitch pins

[Ed Sutton]

Avery,
Your version below is much better than the one I have.
A copy is now in my Baldwin folder.
Thank you!
Ed

----------
>From: Avery Todd <atodd@UH.EDU>
>To: caut@ptg.org
>Subject: Re: Accu hitch pins
>Date: Fri, Aug 9, 2002, 8:55 AM
>

> Ed,
>
> Is this the one you're referring to?
>
> Avery
>
>>Ray-
>>Contact Baldwin and ask for the little instruction booklet.
>>If they don't have any more, I'll send you a photocopy.
>>Ed Sutton
>
> 1-29-1997
> TS039D
>
> PROCEDURE TO ESTABLISH PROPER DOWN BEARING OF STRINGS ON BRIDGES OF BALDWIN
> GRAND  PIANOS DESIGNED WITH HOLLOW VERTICAL (ACU-JUST) HITCH PINS
>
> These conditions must exist before bearing can be established:
>
> 1.All strings associated with the treble bridge must be in place,  (Bass
> strings to be installed later.)
>
> 2.  These strings must be tuned to A-440 pitch.
>
> 3.  All strings on the treble bridge must be set at proper height on their
> hitch pins to read zero (0.0) bearing at the bridge.  Follow this procedure;
> begin at treble end of treble bridge with note #88 and work toward bass.
> Lift wire and raise tension of the strings on the first ten (10) notes,
> Then raise wire and adjust tension of the next ten (10) notes and proceed
> on until all wire is adjusted in this manner on the treble bridge.
>
> Procedure for string height adjustment.
>
> 1.  Become familiar with bubble gage adjustments and application as shown
> with the attached illustrations,
> 2.  With strings at normal tension, begin with strings at the bass end of
> the treble bridge and work toward the middle,  Set bearing values as shown
> in the following chart on specified notes only.  Tap the string down by
> placing the tool over the hitch pin, resting on the wire,  with the bubble
> gage held onto proper strings with the magnet built into its base, tap the
> setting tool with a small hammer to lower the string to achieve a proper
> bubble gage reading.  If the string is too low, raise the string, using a
> coil lifter and leather or felt to protect the plate finish.
>
> Scale              SA(5'2")  ST(5'8")  SC(6'3'')  SF10(7'0")  SD10(9'0'')
> Notes to be set    27-44     27-43     23-40      21-39       21-35
> Bubble Deflection  1 divis.  1 divis.  1 divis.   1 divis.    1 divis.
>
> 3.  After strings associated with the notes which were adjusted in the
> preceding operation have been set, proceed on with notes listed in the
> following charts.
>
> Scale              SA(5' 2")  ST(5'8")  SC(6'3'')  SF10(7'0")  SD10(9'0")
> Notes to be set    45-53      44-53     41-53      40-53       36-53
> Bubble Deflection  2 divis.   2 divis.  2 divis.   2 divis.    2 divis.
>
> Scale              SA(5'2")   ST(5'8")  SC(6'3")   SF10(7'0")  SD10(9'0")
> Notes to be set    54-88      54-88     54-88      54-88       54-88
> Bubble Deflection  3 divis.   3 divis.  3 divis.   3 divis.    3 divis.
>
> 4,  Install bass strings and set at zero bearing,  Then adjust bearing
> according to the following chart.
>
> Scale              SA(5'2")  ST(5'8")  SC(6'3")  SF10(7'0")  SD10(9'0")
> Notes to be set    1-26      1-26      1-20      1-20        1-20
> Bubble Deflection  1 divis.  1 divis.  1 divis.  1 divis.    1 divis
>
> 5.   Retune piano to A-440 pitch.
>
> CONCLUSION:
>
> 1. Bearing adjustments should only be made when the piano is maintained
> under proper climatic conditions.  (Humidity 35% - 45% with temperature
> 70 - 75)
>
> 2. The procedure and bearing gage must be applied in the order established.
>
> 3. A bearing value, previously set, cannot be rechecked because the
> accumulated force of all strings on the bridges will lower the soundboard
> and reduce the settings which were originally set.
>
> 4. 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.
>
> *Hand written note at bottom: 1 div. = .005" shim thickness with a Baldwin
> Rocker Gage.