---------------------- multipart/alternative attachment Hi Ric, 3mm is outside of the box for most manufacturers, for spec regulation. A good concert reg would be 2mm let off and 1mm drop if all action parts are sound. Good hammer tailing and rep springs must be regulated to a professional level. I also look for 1/4" checking on a concert reg. Friction in the rep slot is also critical. Now I feel better having stirred the pot <G> Regards Roger >Over to Jim Hudsons article tho... Dont you think a whole 3 mm letoff is a >bit overkill on the safe side ? Where do you generally like letoff and >drop yourself, and why ? > >Interesting to find so much variance in this seemingly simple point. >Cheers >RicB > > > >James Ellis wrote: > >>This is one I can't resist, so I am going to jump in here with my "two >>cents worth" (No, it's not about tuning). >> >>"PRACTICAL CONCERT WORK" by Jim Hudson, June 2004: >> >>What no one seems to have noticed is the word "Practical" in the title. >>That sets the tone for the whole article, but some readers did not seem to >>hear it. Fred Sturm says he prefers to set let-off at 1/32 inch. Well, I >>don't. If I set it like that, I'd be in trouble for sure. That's right at >>the very edge of blocking, and even if it does not block outright, it does >>not produce a clean let-off, and that results in occasional bizarre sounds >>when the hammer does not completely clear the very first-half cycle of the >>strings vibration. David Love says setting let-off like this is >>"dangerous", and I agree. Otto Keyes says "consistency" is what one should >>strive for, and I agree with that too. But if you regulate to a "gnat's >>eyelash", Bill Garlick has said you better stick around for the concert. >>True, but that might be too late. >> >>In all this nit-picking with Jim Hudson's article, did no one mention drop >>regulation? If you want consistent response for playing very soft >>passages, you had better pay close attention to that too, as well as to >>consistency in the regulation of the repetition springs, and everything else. >> >>"MAGNETIC ASSIST FOR GRAND PIANO ACTIONS", by Richard Brekne, June 2004: >> >>With all this interest in nit-picking Jim Hudson's article, am I the only >>one who has taken a special interest in Brekne's article? This is really >>neat! It is innovative. It is clever. There are other magnetic touch >>systems around, but this one has something clever that the others don't. >>One of the first questions that popped into my head was the non-linear >>decrease in magnetic repulsion as the two tiny magnets move farther apart >>as the key moves. Richard takes care of that by suggesting a second pair >>of magnets behind the capstan, which would be attracting. Thus, the >>non-linear repulsion of the first pair would be compensated by the opposing >>non-linear attraction of the second pair. Very clever indeed!! In other >>words, the combined effects would apply a measured force tending to rotate >>the front of the key downward and the wippen upward around a pivot at the >>point where the capstan touches the wippen cushion. Since the capstan >>never leaves the wippen coushion, the action ratio is not changed. All >>that happens is that the need for lead in the fronts of the keys, and the >>moment of inertia is reduced, without the use of springs. The thing to >>watch out for here will be that the spacing of the magnets will need to be >>regulated as the capstan depresses farther into the wippen cushion over >>time. This, in my opinion, is very clever and very innovative, and I for >>one would like to see how it all plays out in the end. Congratulations, >>Richard! >> >>Sincerely, Jim Ellis >> >> >>_______________________________________________ >>caut list info: https://www.moypiano.com/resources/#archives >> >> > >_______________________________________________ >caut list info: https://www.moypiano.com/resources/#archives ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/28/af/e2/98/attachment.htm ---------------------- multipart/alternative attachment--
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