>> Keep in mind that the wood isn't the termination in a standard >> bridge configuration. The pin is, and as long as the pin is >> solidly embedded in the wood at the cap surface, It is very >> nearly as efficient a termination as an agraffe. That's why >> some of us have gone to laminated bridge caps. > > Yes and no. I think that as long as the string touches the wood cap because > of downbearing, it will influence the sound of the string too, and is likely > to diminish the efficiency of the termination as a whole (more or less, > depending on how stiff that wood cap is). Hi Calin, The hardness of the cap determines the solidity of support of the pin (termination), not the damping of the string directly. That's why CAing the pins clears up a lot of termination problems. The CA isn't put under the string in the middle of the cap, it's soaked in around the pin. > Interesting. I can't tell how much of the improved sustain is because of the > added mass and how much because of the improved termination quality of the > agraffe. Exactly! And since the sustain can be so dramatically increased with mass loading in a standard bridge configuration (given a decent bridge cap and pinning, naturally), the responsibility of the improved agraffe termination for increased sustain comes into reasonable doubt. >> I expect that most of us doing design modifications with >> rebuild have at least one bridge agraffe design we're looking >> for an excuse to throw enough cash at to try out in a real piano. > > So what would yours look like? Why not? Somewhat like this - (drawing). Designed for minimum loss of bridge height to accommodate installation. This could be either extruded and milled, powdered metal cast, or stamped and formed from sheet. If you see a patented version in a piano next year, remember where you saw it first. Ron N -------------- next part -------------- A non-text attachment was scrubbed... Name: bridge agraffe extrusion.jpg Type: image/jpeg Size: 81824 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/20061120/19ecf0d3/attachment-0001.jpg
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