I agree in spirit while I take issue with your premise. Perhaps I'm too hung up on symantics but to answer the question truthfully, does a change in string height that is matched in a change of hammer bore affect the leverage? The answer is undeniably yes. Granted a 5mm string ht/hammerbore change might only reflect a change of a few tenths per unit of action leverage. As to whether the change is significant or anymore of a factor than any other inconsistency within a piano from note to note is another matter. My point is to encourage accurate statements and to define the parameters in which we are working. To encourage changing string heights without a discussion of the affects on entrance height and action geometry is risky. It's tricky business, fer sure. Jude Reveley, RPT Absolute Piano Restoration, LLC Lowell, Massachusetts (978) 323-4545 ----- Original Message ----- From: "John Delacour" <JD at Pianomaker.co.uk> To: <pianotech at ptg.org> Sent: Tuesday, March 24, 2009 7:22 PM Subject: Re: [pianotech] Increasing bridge height > At 11:24 -0700 24/3/09, David Love wrote: > >>It does? How. If you raise the string plane and increase the bore >>distance accordingly so that the shank angle at rest is the same as >>it was before, how does the leverage change? > > It doesn't, of course. A tiny difference in the initial touch weight > will result, but so tiny as not to signify anything. > > JD > >>>Of course, changing the bore distance does affect the entire action >>>leverage... >>> >>>Jude Reveley, RPT > > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090324/fd8021ee/attachment-0001.html>
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