Actually, I should have given credit to Ron. He's the one who posted it. I just simply saved it. :-) Avery >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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