Wim, Be sure the hammer tails have some roughness...50 sandpaper... David Ilvedson, RPT Pacifica, CA 94044 ----- Original message ---------------------------------------- From: "Willem Blees" <wblees at bama.ua.edu> To: "College and University Technicians" <caut at ptg.org> Received: 11/10/2006 2:43:10 PM Subject: Re: [CAUT] tight balancier >Quoting RicB <ricb at pianostemmer.no>: >> >> This said... Skolnik covers a lot of good ground on this thread in a >> >> short space. Wims problem .... Wim, seems to me you have more or >> less >> eliminated the balancier centerpin tightness and the repetition >> tension >> from the field of potential sources of your problem. Strikes me as >> time >> to look for other sources. David listed up quite a few classics. >> >> Cheers >> RicB >Ric >I have done just about eveything David mentioned to solve >my "bobbling" problem. If you recall, I just found out about the >balancier centerpin solution at the seminar a couple of weeks ago. So >this is basically my "last resort". >As I said, I got a bunch of balanciers up to 6 grams. Now I will go >for more resistance, when I can find a couple of hours in the hall. >Wim >> >> >> David writes: >> << The ability of the hammers to be held in >> check is affected by: >> <SINP> >> jack position at rest - too far forward will leave jack too close >> to >> knuckle after let-off, either allowing descending knuckle to >> bound on >> jack top, or the back radius of the knuckle will rub or >> otherwise >> push jack out of the way, stealing energy from the descending >> hammer >> that might prevent it from overcoming rep spring.>> >> >> I don't know that I understand this. I believe that the jack >> position at >> rest, if moved farther under the knuckle, will simply cause the >> jack >> to begin >> moving earlier in the keystroke, (for a given let-off). Once >> the >> jack is off the >> spoon, it doesn't matter where it started. >> It is helpful to place the action in check, then adjust the >> capstan so >> that the jack is equidistant between the knuckle and the stop >> pad. >> This is your >> optimum blow distance for that particular let-off and dip. >> Changing >> the >> beginning jack position won't have any effect on this. >> Regards, >> >> >> >> Ed Foote RPT >> http://www.uk-piano.org/edfoote/index.html >> www.uk-piano.org/edfoote/well_tempered_piano.html >> >Willem Blees, RPT >Piano Tuner/Technician >School of Music >University of Alabama >Tuscaloosa, AL USA
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