Point by point (this stuff can get confusing): > After reading Davids S post I have to concur with what he says, and am left wondering how any of this can bear on your origional problem. And have the following comment to throw out.. Yes, I think he is right. But if it is such that the jack sneaks under there, but the hammer is sitting on the jack top and not on the rep lever, then the rep lever might as well stay home. I guess that's what I was thinking (assuming I was thinking at all). > A ball park regulation will allow letoff unless something is keeping the jack from moving far enough. I have to assume Alans rough regulation was good enough. I am left with the feeling that there is something that hasnt been said yet. Yes, that's the mystery I'm trying to solve: Why did a slight adjustment make such a go, no go difference for regulating the whole action cycle. > Let me see if I have this right. You adjusted letoff /*and confirmed*/ letoff with the action out of the piano but upon insertion the hammers jam against the stings ? No, no, no ... Now I see where I have confused everyone a little. In that the jack top definitely got out from under the knuckle, it did let off. What wasn't happening was any hammer drop. In the vertical, that hammer changes direction at letoff, so I was thinking (well maybe) "No drop, no letoff." I think that the jack must have been high enough that when the lever hit the drop screw the knuckle just sat on the jack top, or the back edge thereof, and never fell to the rep lever. Then in the aftertouch, the lever just swooped up and picked up the knuckle off the jack. But it seems the jack would have to be awfully high to stay in the ball game after rotating out and, as I say, it certainly didn't LOOK way out of spec. Maybe Brother Skolnik gave us another clue with his Renner/Shteinvay experience. Maybe it's a design problem or a jack that's a little too long or some such, i.e., a manufacturing tolerance error or, as we like to say here in the Ozarks, a Consarned Boo Boo. Speaking of boo-boos, happy Halloween, all. Speaking of Halloween, I saw a vampire at the blood bank this morning; he was opening a checking account. Must be frustrating when all your work is in vein. Alan Barnard Salem, Missouri > After reading Davids S post I have to concur with what he says, and am > left wondering how any of this can bear on your origional problem. And > have the following comment to throw out.. > > A ball park regulation will allow letoff unless something is keeping > the jack from moving far enough. I have to assume Alans rough regulation > was good enough. I am left with the feeling that there is something > that hasnt been said yet. > > Let me see if I have this right. You adjusted letoff /*and confirmed*/ > letoff with the action out of the piano but upon insertion the hammers > jam against the stings ? > > RicB > > I recopy (with line shifts) the origional querrie... > -------------------- > Chinese Steck grand. G4 will not let off, period. Checked and adjusted > drop, letoff, blow, etc., etc. Increased drop, decreased letoff, > whatever. It just would not cycle through and let off. Removed front > punching to make sure aftertouch was more than enough: no help, hammer > lifts into strings and it would go higher still. No foreign objects, > excessive wear, or anything of that sort. > > There was the tiniest (and I mean tiniest) teeny, itty-bitty, puny, > little thing that made all the difference in the world--more than you'd > ever guess possible unless you've seen the effect. > > This ought to be a good and instructive puzzler, especially for people > who are just learning grand regulation or preparing for the technical exam. > > What was it? > ----------- > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives
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