gordon stelter wrote: >>Thing is... if the design (with regard to jack >>length and angle a.o.) is >>also borderline then you dont have a lot of room for >>error... and you >>start hearing comments like "its either power or >>bobbling" as we've >>heard. Course you have to solve for bobbling. :) >> >>Cheers >>RicB >> >> > >Yup. Did an ultra-super-careful keyleveling and lost >motion adjustment today ( using the >press-on-the-back-of-the-key-method ). Spent 5-1/2 >hours on just these two items, and the bobbling DID go >away. But the letoff is still 5 to 10 mm throughout >the keyboard, so I would be very surprised if some >bobbling did not return once I set this to the 1.5 to >3 mm authorized by Yamaha. > > You may have to do a few other things as well to get things like you want them. Bring the blow distance in to the minimum side of Yamaha specs, re-adjust the capstans for lost motion. Check your damper spring strengths, and the strength of the jack return springs. They only need to be strong enough to do their respective jobs...and any extra strength usually causes more problems (like bobbling) then any benifit that might yeild. Make sure both stop rails are not part of the problem, and lube the jack centerpins. If its buckskin you have there.... a bit of teflon mixed in with protek can help any friction issue you have. > I have never seen a piano so unforgiving, become >so unplayable, with such slight lost motion! I still >think that an overly fluffy buckskin, a too sharp edge >on the jack tip and some fricative aspect between the >bucksin and plastic jack are culpable. > > Probably doesnt help the situation thats for sure :) > It made me think of a Jaguar automobile: Fun to drive >when in adjustment, but easily knocked out of whack. > Will keep y'all posted. > Thanks! > Thump > > > You should be able to get this running smoothly. I have confidence in you :) Cheers RicB
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