Recrowning

[Marcel Carey]

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
>
>
>