Dear List, I was saw a baby grand that had had that repair made (shim in the bridge). I can assure you that the repair had NOT restored any sustain to the board. The board maybe wasn't flat anymore, but it DIDN'T sound anything close to a new soundboard. To me, this kind of repair is a loss of time and customer's money. Marcel Carey, RPT Sherbrooke, QC At 07:48 97-05-29 -0700, you wrote: >Richard and list, > >AHA, there's the rub. > >Even if you put in multiple wedges, the crown so induced has a net affect >only on the area of the board in the immediate vicnity of the bridge. >(Leonard, among others talked about this, I am not sure if he endorsed it.) > > >Also, "wedge" is a relative term. In this case, it would be not so much a >wedge as a shim, driven into a saw kerf after the board is jacked up. The >kerf, to be effective, would have to be made _prior_ to jacking up the >board, so as to be more open when the crown is "corrected", thus allowing a >larger wedge, which would, in turn, not only be more effectively clamped in >place, but would create more "staying power" in the induced crown. The >placement of the kerfs should be determined during the taking of your very >painstaking measurements... > >Like I said, just about as much trouble as installing a new board, without >the benefits. > >Best. > >Horace > > > >>In reply, so as to keep the thread on Horace's comments, I seem to >>remember Leonard Jared talking about placing a wedge in the bridge >>ala keystone fashion. This would involve cutting the bridge in such a >>way to insert this as I don't think he mentioned removing the bridge. >> This is so vague in my memory, I am not sure of any other details. >>Perhaps some one else has heard of this. The soundboard had to >>"jacked up" the incision made (before or after?) in a predetermined >>spot, the wedge inserted, and the sb let back down. This was only >>from "hearsay" and was it from him even?? >> Even if this is a case of me not distingushing dreams from reality, >>(is that why I perceive some saying, "Ah ha, he has let the cat out >>of the bag?") on THINKing about this, more than one wedge might be >>needed. But where? Also I would like to ask, how does the bridge >>run in relation to the crown? >> >>Richard Moody >> >>"I wanted only to try to live in accord with the promptings >>which came from my true self. >>Why was that so very difficult?" >>Hermann Hesse Demian >> >> >>Ever seen a wine cork placed between the wooden post and a rib? >>Probably to stop a buzz. Not the one created by uncorking the wine >>bottle. rm >> >> >> >>---------- >>> From: Horace Greeley <hgreeley@leland.Stanford.EDU> >>> To: pianotech@byu.edu >>> Subject: Re: Recrowning >>> Date: Wednesday, May 28, 1997 8:08 PM >>> >>> Jon, >>> >>> Gee, I don't know, this is my fourth post to the list in one day... >>> >>> You wrote: >>> >>> >I heard from a guy who claimed he can re-establish sound >>> >board crown with shims. Even if it has 3/8" negative crown. >>> > >>> >Can someone fill me in on what I might have missed in the >>> >last few years of trying to keep up with the last few hundred >>> >years? >>> >>> Sure - this is something a bunch of us retired a long time ago. It >>does >>> keep surfacing, however. >>> >>> So, now that you know what my prejudice is: >>> >>> While there are different methods, the deal is to disassemble the >>piano, >>> usually invert it, wedge the board up by driving wedges(!) between >>the >>> beams and ribs, then proceed with whatever repairs are in order for >>the >>> board (shimming, etc.), then glue all in place (except for the >>wedges, of >>> course). >>> Among the variations I've seen/tried >>snip see thread > > > > >Horace Greeley hgreeley@leland.stanford.edu > >LiNCS voice: 415/725-4627 >Stanford University fax: 415/725-9942 > > >
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