Paul McCloud wrote: > > ...Mark Burgett (Pianodisc) told > me that he had a problem with Young Chang actions which would seize up > after being played with the pianodisc. He said that the pins would get > heated up and the fibers of the bushing cloth would glue themselves to > the centerpins. It seems that the felt Young Chang uses is made in > their own factory, and that there is some kind of residue left after > manufacture which causes the problem. He thought that since the > Pianodisc is played sometimes for long periods that it shows up more > often than with ordinary playing. He may be right about it, though I > don't really know. But it does give one thought in regard to sticky > action centers. > Thanks again for your input. > > Paul McCloud, RPT > San Diego, CA ------------------------------------------------------- Paul, We've had the same problem with Renner parts. We "play-in" each piano before delivery using a machine that plays each key two times per second for several hours. The fingers are set up to simulate the force of a medium blow by a pianists fingers. We've attributed this "freezing-up" problem to the graphite coating that Renner uses on their bushing felt, but it could just as easily be the glue coming through. It's a litter hard to believe that the action centers could get that hot, though. In any case, this is a different problem than the one your having with damp actions. My reason for building the box was so that I could slowly dry out the entire action, not just spots of it as I had been doing with a heat gun. I also found the heat gun to be often ineffective. Drying too fast, i.e., using too much heat, would overly shrink the action centers leaving me with much more work than I wanted to put into most of these pianos. Slowing the drying rate freed up the action nicely without causing a lot of peripheral damage. I usually did have to tighten every single screw in the entire action, however.
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