Ed this morning on the Concert D, I repinned about 2 dozen balanciers in octaves 2 and 3 from about 2 grams up to 6 grams. I had to reset the springs so that the hammer just barely moves up on release. The bobbling was less than before, but they still do not check on a medium to soft blow. I checked the resistance on the lowest octave, and they were at 6 grams already. But they are also still bobbling on a medium blow. (They do check on a harder blow). Have you tried increasing the resistance to more than 6 grams in the low bass? Wim Quoting A440A at aol.com: > Wim writes: > << someone mentioned that a tight > > balancier will cause a hammer to bobble. My question is, does anyone > > > have a gram resistance measurement for this? << > > I like balanciers to be pinned about 4-6 grams, (just like the > jacks). > > > >If the balancier is tight, then the spring > > will need to be tight, which could cause the hammer to bobble. But it > > > is too loose, the spring would need to be loose, which could cause it > > > not to hold the hammer. << > > An excessively tight balancier will require an excessively tight > spring, > which will cause excessive friction between them. If this is the > case, the > rebound from a very soft blow will not even move the balancier off > the drop > screw, causing the hammer to bounce. > > >>I have several pianos with bobbling hammers, especially in the 2nd > and > > 3rd octave. Before doing anything, I want to know what to do. >> > > I would try repinning the balancier on those notes, reset the > spring, > and see what happens. I would suspect that the problem is in the arc > of the > tail and the angle of the back-check. (I like to have the springs as > tight as > possible without being able to feel the hammer kick upon release from > the > back-check). > Regards, > Ed > Willem Blees, RPT Piano Tuner/Technician School of Music University of Alabama Tuscaloosa, AL USA
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