This is interesting. And what kind of a tone are you listening for "when lifting up on the hammer rail, and thumping down on the balance rail"? What are you doing that will produce a tone? Playing a key? Will lifting on the hammer rail somehow make a sound? Thanks Terry Farrell ----- Original Message ----- From: "Richard Brekne" <Richard.Brekne@grieg.uib.no> To: "Pianotech" <pianotech@ptg.org> Sent: Friday, May 23, 2003 6:49 AM Subject: Re: No Power Yamaha revisited > Thanks muchly Roger... > > seems to be the description that makes the most sense so far. Very roughly > then, adjust the glide bolts so that they all are in contact with the bed, AND > all lift the balance rail to the point that the Front Rail is just a nats butt > away from being lifted as well... > > Key height and the rest is set afterwards. > > Correcto ? > > > Roger Jolly wrote: > > > Hi Avery & Ric, > > I have a good minds eye view, of what is going > > on, but I'm not so sure I can explain it well. But here goes. (Send me a > > deluxe flame suit Conrad). > > > > If you have the bolts just touching, there is no compression force acting > > on the balance rail. With rapid forceful playing, there is a small amount > > of bounce taking place at the balance rail, robbing the action of a lot of > > energy. It gets dissipated within the frame. > > Jack the bolts a little further down, you start to bow the cross > > struts. and putting some compression into the rail. , and firmly seating > > it to the bed. At the Yamaha Technical Academy, they spend a good deal of > > time teaching you how to tune these rails in aurally. takes more than a > > little practice to get optimum results. > > The front rail is done first, by tapping on the front rail with a kind of > > 45 degree blow, to the leading edge of the rail. (You can hear better than > > the traditional method of holding a key down and thumping on the key, the > > front rail punching absorbs a lot of noise,) Then the bolts are adjusted so > > the front rail just starts to lift, then back off about 1/4 turn. Next > > step is get all the glides bedded so the tone is the same when lifting up > > on the hammer rail, and thumping down on the balance rail. > > > > The closest analogy I can think of, is like string bearing across the > > bridge. Too much bearing and a loss of tone, too little loss of tone. > > > > Now I will crawl under my rock and smile. > > > > Regards Roger > > > > > > Cheers > 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 > >
This PTG archive page provided courtesy of Moy Piano Service, LLC