Richard B.: I do recall an entry by David Stanwood sometime back addressing this issue. He outlined an action in which this very problem existed which he solved by a staggered capstan line calculated to give equal overall leverage between the sharps and naturals. You might check with him (if you haven't already). David Love ----- Original Message ----- From: "Bill Ballard" <yardbird@vermontel.net> To: "Pianotech" <pianotech@ptg.org> Sent: January 17, 2003 6:23 PM Subject: Re: More off the wall stuff At 12:37 AM +0100 1/18/03, Richard Brekne wrote: >We see very very often that the key ratio between the black and whites >are significantly different. Sometimes as much as from 0.50 to 0.54. >Perhaps more in some exceptional cases. There has been thrown out >several different ways of approaching handling this. But here is one I >havent heard and am curious about. I didn't really pay attention on round one of this, but wasn't relocating balance pins and buttons one suggestion? IOW, side-by-side balance pins all @ .52? I'd certainly start there, although it is ticklish finicky work which I would ask some else to do. And damned expensive, too. >What would bad about staggering the knuckle position ? It wouldnt take >much to compensate for the difference in key ratio to even out the >overall ratio.... I'd worry that making as significant a change as required might stray from the optimum which the engineers had designed, causing (say) the sharp shanks to wear faster and fail earlier than the natural shanks. I personally think that wherever you try to alter the leverage to equalize the two, there are serious risks. I would thus prefer to see the extent to which the differences can be masked with the helper spring. >Just another thought I'd love hearing your thoughts about. read: trick question. Like David Love's Lady or the Tiger: friction or DW? And your, "Does keeping the weight low on the molding or high, affect the strike weight (and thus, action ratio)?" Ric, my soybeans haven't broken through the 2' of snow over here, yet. Usually the crocuses have come up first, but I haven't seen them yet. How are yours? Bill Ballard RPT NH Chapter, P.T.G. "All God's Children got Rhythm" ...........Ivy Anderson in "A Day at the Races" +++++++++++++++++++++ _______________________________________________ pianotech list info: https://www.moypiano.com/resources/#archives
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