Jon is certainly correct in his observation on the importance of capstan placement to action geometry. One could add knuckle placement and action spread as additional important contributing factors. My intent wasn't to get into design issues, but just to observe from a practical point of view that the likely cause of the annoying problems - repetition being iffy and the jack hitting something, maybe the flange - was the excess aftertouch, based on what Jeff reported. If the action regulated well with .39 dip and, I assume, about 1 7/8 blow, as Jeff stated (he didn't say how much blow), then it should regulate reasonably well with .375 dip and 1 5/8 to 1 3/4 blow, at least in my experience, with the caveat that aftertouch might be less than I'd like and check distance might need to be tweaked on the far side. And if that's what the customer wants, more power to him (he'll need it to get the volume, but maybe he doesn't want volume so much as some form of finesse). On the other hand, I find it hard to imagine a pianist wanting greater than 1/16 letoff. Regards, Fred Sturm University of New Mexico Jon Page wrote: > > If you really want to start analyzing the key stroke, the location of the > capstan > on the key will determine where the jack will end up at the end of the key > stroke > with a given dip, hammer length & blow parameters.
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