Sounds good. I don't understand this though: "that means that the bridge is being *pulled up* by the strings" in the second case. It was my understanding that negative bearing means the bridge is lower than it should be, causing the strings to be slightly v-shaped rather than ^-shaped. On Thu, Dec 24, 2009 at 11:39 AM, David Love <davidlovepianos at comcast.net>wrote: > If you have positive bearing and positive crown then you have downward > pressure on the board with residual crown so if you take off the strings the > board must rise, i.e. the crown remains positive. Good sign. > > > > If you have positive crown with negative bearing that means that the bridge > is being pulled up by the strings and to what degree that is responsible for > the crown formation you can’t tell until you take off the strings. Bad > sign. > > > > If you have positive bearing with negative crown you can’t tell whether > when you remove the strings the board will rise to show positive crown or > not since you don’t know how the bearing was originally set or exactly how > far down the bearing is pushing the crown. Bad sign. > > > > If you have negative bearing and negative crown that means the board is > being pulled up but even with that is not achieving positive crown. > Definite burnt toast. > > > > Keep in mind that each section of the piano may show different > relationships to crown and bearing and, as Ron mentioned, several > measurements are necessary across the panel. > > > > David Love > > www.davidlovepianos.com > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20091231/c2089475/attachment.htm>
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