Roger Jolly 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 > So... I dont quite understand... why does this require the balance rail to be jacked up so high ? Any higher and I'd be lifting the front rail up. You would think that sitting on all 6 glide bolts would do the job... but no.... they have to be jacked up to a certain height as well. If someone got to releveling the keys,... this could cause some real confusion me thinks. How is the proper key height determined without the proper balance rail height being determined foist as it were... and what is the proper balance rail height to begin with ? Mmmmmm ?? Confused as usual RicB > > 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 -- 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
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