Any advise for regulating this ? Don't find for exemple in Reblitz book !? LC ----- Original Message ----- From: <pianoguru at cox.net> To: "Pianotech List" <pianotech at ptg.org>; "Mark Wisner" <markwisner at earthlink.net> Sent: Friday, August 22, 2008 2:49 PM Subject: [Norton AntiSpam] Re: Yamaha U1 > The jack rail is effective in improving repetition.. Julia, you'll notice > that in other upright actions there may be felt on the back side of the > let-off rail to serve the same purpose, or a felt block on the jack near > the top, or a smaller felt block on the back of the catcher, all serving > the same purpose. The difference is that the rail is adjustable, to > achieve the absolute minimum of necessary movement away from the hammer > butt. The same screw that mounts the rail is the adjusting screw. If the > threads of the screw were the same along its length, turning it would > affect no change in the rail position, but the threads through the rail > are "faster" threads than at the tip where it enters the main rail, > allowing for the tiny bit of movement to finely control its adjustment. > > Frank Emerson > > > ---- Mark Wisner <markwisner at earthlink.net> wrote: >> It's a jack-stop rail, and supposed to keep the jack from whipping too >> far on back on a very hard blow. >> >> -----Original Message----- >> >From: KeyKat88 at aol.com >> >Sent: Aug 21, 2008 6:15 PM >> >To: pianotech at ptg.org >> >Subject: Yamaha U1 "extra" rail >> > >> >Greetings, >> > >> > What's with the extra rail in the front of the Yamaha U1 action? I >> > have >> >never seen this before. Its down in front near the letoff rail >> > >> > >> >Julia Gottshall >> >Reading, PA >> > >> > >> > >> >**************It's only a deal if it's where you want to go. Find your >> >travel >> >deal here. >> >(http://information.travel.aol.com/deals?ncid=aoltrv00050000000047) >> >
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