Hi Roger, But why won't Yamaha tell us how they do it? (See my previous post to Richard.) Avery At 01:56 PM 05/22/03 -0600, you wrote: >Hi Ric, > A very soft flexible action frame, they move a lot. I bed > these frames every time I tune a Yamaha grand. >With practice it only takes about 3 or 4 minutes. The weight of the keys >is more than enough to flex those frames, hence the change in dip. >The design is such that the frame is is supposed to flex. >Bin thar and bought the tee shirt. <G> > >Regards Roger > >At 06:12 PM 5/22/2003 +0200, you wrote: >>Ok guys and gals... >> >>I gots to eat crow here... I think anyways. As it turns out I managed >>to finnally solve the hammers bouncing all over the place thing by >>turning up all the bed screws so that the key frame was solidly bedded >>with the actuall wood of the balance rail a full 2 mm elevated over the >>key bed. Huge increase in power, but this also caused an increase in >>keydip to 10.5 mm (!) and forced a drop in blow to just above the >>cushions... perhaps the shanks are about 2-3 mm off. However.... >>absolutly no bouncing of neighboring hammers any more, and that feeling >>of loosing power is gone. >> >>What I dont get is why the Balance Rail needs to be elevated so much. >>And how are we supposed to determine the proper balance rail height to >>begin with ? I was always told that glide bolts need to just make >>contact with the key bed... not to lift the whole darn middle of the key >>frame up. >> >>Explainations please ? >> >>RicB >> >>-- >>Richard Brekne >>RPT, N.P.T.F. >>UiB, Bergen, Norway >>mailto:rbrekne@broadpark.no >>http://home.broadpark.no/~rbrekne/ricmain.html >>http://www.hf.uib.no/grieg/personer/cv_RB.html >> >> >>_______________________________________________ >>pianotech list info: https://www.moypiano.com/resources/#archives > > >_______________________________________________ >pianotech list info: https://www.moypiano.com/resources/#archives
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