Hi Chunping: You must be a violin player. Violin bridges are never glued, but piano bridges must always be glued to the soungboard. Jim Coleman, Sr. On Mon, 24 May 1999, Chunping Ding wrote: > Dear Dave, > > Thank you very much for your kind advice. I eventually removed the bridge and > its apron from the soundboard. I found some old bridge from another piano, and > put it back to my piano. However, the volume of the sound is very small. I > guess the reasons for this may be: > > 1. I did not use glue between the bridge and the sourdboard. (Because I am no > so sure about the positions of the bridge and the pins etc. I would like to > play with the new bridge). However, I do not understand why do we need to put > glue between the bridge and the sound board? I think that the pressure from the > strings are strong enough to stick the bridge on the board. > > 2. The contact between the bridge and the sound board are not smooth. When I > take the bridge off the soundboard. The soundboard are slightly damaged. I hope > after I apply glue between the soundboard and the bridge, the sound will be > better. > > 3. Using the new bridge, the speaking lengths of the strings are smaller. > > The heights of the new bridge is the same as the old one. > > Hopefully, after I apply glue, the sound volume will be increased. > > Any advice, > > THank you again, > > Chunping > > > DGPEAKE@AOL.COM wrote: > > > In a message dated 5/21/99 6:02:07 AM Pacific Daylight Time, cding@att.com > > writes: > > > > << Hi, everybody. > > > > I am new in piano technician team. My first major task is to repair a > > seriously cracked base bridge of my upright piano. One fourth of the > > pins are loose. I would like to re-cap the bridge. Firstly, I would like > > to take the bridge off the sound board. I tried to put vinegar between > > the bridge and the bridge apron (shelf). However, I failed to dissolve > > the glue. Does anyone know any more powerful dissolvent? Or do I have to > > use some special vinegar (I used my cooking vinegar)? Or is there any > > hidden screw between the bridge and the apron? Then I tried to dissolve > > the glue between the apron and the sound board. I failed again. Could > > someone give me some hints on how to take the bridge off? > > > > Your help is highly appreciated. > > > > Chunping > > > > > > Chances are it was put on with animal hide glue. Mix 1 part wallpaper > > remover to 1 part H2O and apply on the glue joints. You may want to apply > > some heat from a heat gun to help soften the glue. Make sure all of the > > screws are removed. Sometimes part of the soundboard may come with the > > bridge, but that is not a hard repair, if you do not remove the part off of > > the bridge. Another alternative is to apply epoxy in the cracks rather than > > recap. Email me privately and I will tell you how to do it. > > > > Dave Peake, RPT > > Portland Chapter > > Oregon City, OR > > > >
This PTG archive page provided courtesy of Moy Piano Service, LLC