<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=us-ascii"> <META content="MSHTML 6.00.2800.1126" name=GENERATOR></HEAD> <BODY> <DIV>Yes Roger,</DIV> <DIV> </DIV> <DIV>On the other hand, that kind of treatment is in the end abuse to the = instrument, Japanese use to say that it is unfortunate, but concert prep is in the = meantime destroying the instrument.</DIV> <DIV> </DIV> <DIV>Warping up the stack more and more on Steinways finally warp = the wood more or less definitively I guess.</DIV> <DIV> </DIV> <DIV>On soft wood less problems, but still the action  may suffer if = overdriven mode is considered (shanks on cushion, etc) as its normal regulation.</DIV> <DIV> </DIV> <DIV>I guess you put things more "civil" after hours, if you want to keep your instrument longer is not it ?</DIV> <DIV> </DIV> <DIV>Best Regards</DIV> Isaac OLEG Entretien et réparation de pianos. PianoTech 17 rue de Choisy 94400 VITRY sur SEINE FRANCE tel : 033 01 47 18 06 98 fax : 033 01 47 18 06 = 90 cell: 06 60 42 58 77 <BLOCKQUOTE dir=ltr style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px = solid; MARGIN-RIGHT: 0px"> <DIV class=OutlookMessageHeader dir=ltr align=left>-----Message d'origine----- De : pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]De la = part de Roger Jolly Envoyé : samedi 24 mai 2003 00:33 À : Pianotech Objet : Re: = No Power Yamaha revisited </DIV> You got it TOYOTA!   <G>   Do it this way even when you don't think there = is a problem, and note the results.  You are going to be = surprised.   On some Concert grands for favorite pianist,  I will have the = cheek blocks in and tight, and just tension the rail a little,  then = restore after touch by lowering the hammer line. Neat trick for a big = concerto, for a not so big piano.  Shush!  did I say that. Have a = good week end. Roger At 12:49 PM 5/23/2003 +0200, you wrote: <BLOCKQUOTE class=cite cite="" type="cite">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: <BLOCKQUOTE class=cite cite="" type="cite">Hi Avery & Ric, = =            &nb= sp;           &nbs= p;  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    </BLOCKQUOTE>Cheers RicB -- Richard Brekne = RPT, N.P.T.F. UiB, Bergen, Norway <A href="mailto:rbrekne@broadpark.no">mailto:rbrekne@broadpark.no</A> = <A href="http://home.broadpark.no/~rbrekne/ricmain.html" = eudora="autourl">http://home.broadpark.no/~rbrekne/ricmain.html</A> = <A = href="http://www.hf.uib.no/grieg/personer/cv_RB.html">http://www.hf.uib= .no/grieg/personer/cv_RB.html</A>   </BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>