>Is there an established general guideline with respect to the height of the >damper flange center such that with a given damper flange center height the >height of the key end felt off the key bed should be x. If the key lifts the underlever to 1 3/4" (a) and the lever center pin is 3/8" (b) from the under side of the lever then to lift the lever to parallel with the key bed would have the pivot located a+b = 2 1/8" (if pivot is located in-line with the flange centers). A line drawn from the balance rail hole to the underlever flange center would need to encompass the thickness of the back rail cloth. For all practical purposes, I think it is overkill unless you are redesigning or reestablishing the system and I doubt its impact with so many different designs (spoons) and it being outside of the actual action mechanism. So to answer your question, if the underlever center is 2 1/8". Subtract the center distance from the underside of the lever -3/8" Subtract key end travel (or dip) -3/8" Key end felt height = 1 3/8" That is, if you are lifting the lever to parallel with the keybed. Regards, Jon Page -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090315/3ec5bd8c/attachment.html>
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