Tuesday, November 13, 2012
My sound board press is unique as it also doubles as a bridge press. After appling glue, I fasten the bridge to the board with temperary screws through the ribs where dowels will be installed later. The the board and bridges are placed in the press to add additional clamping pressure along the entire plane of the bridge.
Wednesday, November 7, 2012
After the bridge cap is sanded, templates made from the original caps are located on the new cap and the information transfered to the new bridge. The bridge is then again dry fitted to the soundboard, and the soundboard is again dryfitted to the piano. The location of the marks for the pins are checked against the plate hitch pins and agraffes, and any necessary adjustments are made. On this piano one section was out od alignment by about 1/4". Yes, the factory does make errors, and ther rebuilder has the opportunity to correct them.
Thursday, November 1, 2012
Setting the bearing on a new sound board is one of the most demanding steps in the rebuilding process. An over simplified description of setting the bearing is this: adjusting the height of the bridge caps to a height that causes the strings on the strung piano to cause downbearing on the soundboard. It is important to have enough, but not too much. It is also determinded to some extent by the amount of crown in the board. So how do I accomplish this?