Fred- This could be an opportunity to experiment with springs under the soundboard....maybe set them on a rail parallel to the bridge, and have nice adjustment screws to adjust tension.... ;-) Ed S. ----- Original Message ----- From: "Fred Sturm" <fssturm at unm.edu> To: <caut at ptg.org> Sent: Tuesday, April 28, 2009 10:57 AM Subject: Re: [CAUT] [pianotech] Baldwin Accujust > Well, this board has a bit of crown, not flat or negative like most I > have (Next to nil is a lot here in NM: there is actually a bit of shadow > cast by the string I stretch). Current conditions, bearing is flat to > negative, with a wee bit of positive in the very top treble. So my take > is I should bring the string plane down to meet the bridge, just > measurably positive bearing most places, a bit more high treble, probably > trying for a bit less than the Baldwin specs (work done with the piano at > the low end of RH). This is where the piano will be most of its life > (these RH parameters). And I'll see what I see. > Expectations? Hey, I just want the darned strings to render so I can tune > it. Anything else is gravy, and a bit of experience. But, in any case, I > threw some of this out as a counter to the notion of measuring how high > the strings are on the accujust pins right now and using that as if it > told you something useful. What does that measurement tell you? Nothing > in and of itself, unless you have at least measured bearing, and then > it's loaded bearing. > Of course, if I have negative loaded bearing, I'm not sure where that > puts me. I'll see what crown I have once the strings are off. In any > case, I will match the strings to where the board is, rather than > duplicate the current negative bearing. Which is what I often end up > doing with restrings on non-accujust pianos (a matter of practicality, > resources available). > Regards, > Fred Sturm > University of New Mexico > fssturm at unm.edu > > > > On Apr 27, 2009, at 9:59 PM, Ron Nossaman wrote: > >>> I so rarely see positive bearing and crown in more than sporadic and >>> tiny increments out here in the desert, I guess I've stopped expecting >>> it. In any case, it seems like I should have the mindset of finesse and >>> easy does it for the Baldwin accujust job. >> >> Without what it takes in crown and bearing to make the things function, >> I'd think finesse would easily segue into fantasy undetected. When faced >> with the impossible, you do what you can and temper expectations >> accordingly. >> >> >>> My notion is I don't really care about reproducing what is there now >>> (40 years later or so), but I do want to load the board somewhat, and >>> probably no more than it was designed to be at first. Crown is next to >>> nil at this point, which is under conditions of 8% RH last reading, and >>> below 20% for the last 6 months. >> >> All of which is outside design parameters. So in the absence of design >> criteria, what become the priorities? > >
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