Yep. From instructions below: >> "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.)" I just completed stringing and setting DB on an L a couple hours ago. I found it easier than anticipated, that I was able to do very controlled tapping down and needed next to no lifting of strings. That meant starting with all strings high, which I accomplished while stringing by having a spacer beneath and spring clamp above each string when installed, the spacer being large enough to create negative DB. (And moved the spacer on to the next hitch pin). I found that using a 16 oz claw hammer, lightly tapping, I got excellent control on how far down the string moved. Regards, Fred Sturm University of New Mexico fssturm at unm.edu On Jun 11, 2009, at 3:37 PM, Bob Hull wrote: > > Are these directions saying to bring all treble strings up to 440 > and adjust string ht. and measure with the lowell gauge before > putting the bass strings on? You obviously can't measure with the > gauge on the tenor area with the bass strings in the way. > > Bob Hull > > > ----- Original Message ---- > From: Alan McCoy <amccoy at mail.ewu.edu> > To: "College and University Technicians <caut at ptg.org>" <caut at ptg.org> > Sent: Monday, April 27, 2009 11:52:15 AM > Subject: Re: [CAUT] [pianotech] Baldwin Accujust > > Ron, > > Thanks for supplying this information. Much appreciated. > > Alan McCoy > > >> From: Ron Nossaman <rnossaman at cox.net> >> Reply-To: "College and University Technicians <caut at ptg.org>" <caut at ptg.org >> > >> Date: Thu, 23 Apr 2009 16:10:05 -0500 >> To: Pianotech <pianotech at ptg.org>, "College and University >> Technicians >> <caut at ptg.org>" <caut at ptg.org> >> Subject: Re: [CAUT] [pianotech] Baldwin Accujust >> >> Scott Rogers wrote: >>> I have a Baldwin L to restring, and I can't remember what steps are >>> necessary to setting proper down bearing with the accu-just hitch >>> pins. >>> I know Baldwin used to loan out a downbearing gauge for setting DB >>> on >>> each unison. Does anyone know if they still offer this, and if so >>> contact #'s? >>> Thanks for your help. >>> Scott Rogers, RPT >> >> Bearing1.txt is from a Baldwin tech sheet, direct from the source. >> Bearing4.txt is a conversion chart to relate the instructions >> in bearing1 to degrees, so you can use a Lowell gage, Wixey, >> or whatever, instead of Baldwin's gage. >> >> Ron N >> >> Bubble reading to Degrees to Bearing Load conversion >> for Lowell and Baldwin downbearing gauges. >> >> Measure bubble offset difference between string segments >> on both sides of the bridge. Look up angle and bearing factor >> on appropriate chart. For bearing load in pounds, multiply >> bearing factor times string tension. >> >> Ron Nossaman July, 1997 >> >> Baldwin Gauge | Lowell Gauge >> ------------------------------|----------------------------- >> Bubble Degrees Bearing | Bubble Degrees Bearing >> ------------------------------|----------------------------- >> 0.5 0.14167 0.0025 | 0.5 0.08333 0.0015 >> 1.0 0.28333 0.005 | 1.0 0.16667 0.003 >> 1.5 0.42499 0.0075 | 1.5 0.25 0.0045 >> 2.0 0.56666 0.01 | 2.0 0.33333 0.006 >> 2.5 0.70832 0.0125 | 2.5 0.41667 0.0075 >> 3.0 0.84999 0.015 | 3.0 0.5 0.009 >> 3.5 0.99165 0.0175 | 3.5 0.58333 0.0105 >> 4.0 1.13332 0.02 | 4.0 0.66667 0.012 >> 4.5 1.27499 0.0225 | 4.5 0.75 0.0135 >> 5.0 1.41665 0.025 | 5.0 0.83333 0.015 >> 5.5 1.55832 0.0275 | 5.5 0.91667 0.0165 >> 6.0 1.69998 0.03 | 6.0 1. 0.018 >> 6.5 1.84165 0.0325 | 6.5 1.08333 0.0195 >> 7.0 1.98331 0.035 | 7.0 1.16667 0.021 >> 7.5 2.12497 0.0375 | 7.5 1.25 0.0225 >> 8.0 2.26664 0.04 | 8.0 1.33333 0.024 >> 8.5 2.40831 0.0425 | 8.5 1.41667 0.0255 >> 9.0 2.54997 0.045 | 9.0 1.5 0.027 >> 9.5 2.69163 0.0475 | 9.5 1.58333 0.0285 >> 10.0 2.8333 0.05 | 10.0 1.66667 0.03 >> 10.5 2.97497 0.0525 | 10.5 1.75 0.0315 >> 11.0 3.11663 0.055 | 11.0 1.83333 0.033 >> 11.5 3.25829 0.0575 | 11.5 1.91667 0.0345 >> 12.0 3.39996 0.06 | 12.0 2. 0.036 >> 12.5 3.54163 0.0625 | 12.5 2.08333 0.0375 >> 13.0 3.68329 0.065 | 13.0 2.16667 0.039 >> 13.5 3.82496 0.0675 | 13.5 2.25 0.0405 >> 14.0 3.96662 0.07 | 14.0 2.33333 0.042 >> 14.5 4.10829 0.0725 | 14.5 2.41667 0.0435 >> 15.0 4.24995 0.075 | 15.0 2.5 0.045 >> 15.5 4.39162 0.0775 | 15.5 2.58333 0.0465 >> 16.0 4.53328 0.08 | 16.0 2.66667 0.048 >> 1-29-1997 >> TS039D >> >> PROCEDURE TO ESTABLISH PROPER DOWN BEARING OF STRINGS ON BRIDGES OF >> BALDWIN >> GRAND PIANOS DESLGNED 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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