Accu hitch pins

[Avery Todd]

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.