----- Original Message ----- From: "CalinTantareanu" <calin.tantareanu@mae.ro> To: "Pianotech" <pianotech@ptg.org> Sent: September 22, 2003 12:38 AM Subject: Re: String vibrations (was Re: Stuart) > Del, > > Do you have a picture of the device (bridge agraffe) developed at Baldwin? > > Calin No. Though I probably do have a drawing in some early version of the CAD software I was using back then. Whether or not it can still be opened by the new and improved version I'm using now is another issue. Stuart's device uses what appears to be a ceramic rod insert for the leading edge string bearing and a brass rod at the back. Ours were machined of a solid brass block with the string bearing directly on the brass. They were not nearly as pretty. Had we moved to production they would probably have been made of a brass/iron powdered metal alloy. At least that is what we were thinking of at the time. Not being one to pass up a good idea when I see it, if I were to resurrect the idea today I'd sure want to look into the ceramic rod idea. Relative to those I saw on the Stuart piano in Sydney, ours were just a bit longer -- long enough so we could put a small screw on either side of the center post. Besides holding the thing down, these two screws aligned the thing to the bridge -- they went into two pre-drilled holes in the bridge surface. Stuart uses some type of muting material just aft of the leading string bearing, we did not. But, he is using the thing in a limited production piano -- we were experimenting with them -- I expect he may have learned something along the way. Del
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