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.
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