Oh, sorry. I misunderstood the question. I'll call off Guido. Paul In a message dated 3/16/2009 7:52:01 A.M. Central Daylight Time, formsma at gmail.com writes: Yeah, I knew what it is. Just wondered why it's called the "magic line." Does it have to do with where the arcs intersect? Or, that that magic line point of intersection is a point of most efficiency? -- JF On Mon, Mar 16, 2009 at 12:53 AM, <_PAULREVENKOJONES at aol.com_ (mailto:PAULREVENKOJONES at aol.com) > wrote: John: Since you don't know this, obviously you are not on the "need-to-know" list, and if we told you, we'd have to kill you. And here in Chicago, Guido does good business. Actually, it's quite simple. The one being talked about mostly is the line (which can be created in reality with string or thread, and can be seen in an action model with a straight edge) from the balance rail hole center at the key bottom extending to the whippen center. Ideally, the line would be intersected by the capstan top/whippen heel at half of the key travel. The capstan top and whippen heel rotate in opposite directions "bearing" on each other in different ratios in the counterbearing arcs (involutes) of travel. The leverages of the whippen and key change throughout that travel. That's it. No magic at all. Now, which knee-cap do you like the best? :-) Paul In a message dated 3/15/2009 11:01:31 P.M. Central Daylight Time, _formsma at gmail.com_ (mailto:formsma at gmail.com) writes: I'm going on the notion that the only dumb questions are the ones that aren't asked. Go easy on me, OK? <G> Why is the "magic line" called the "magic line"? -- JF **************A Good Credit Score is 700 or Above. See yours in just 2 easy steps! (http://pr.atwola.com/promoclk/100126575x1220439616x1201372437/aol?redir=http:%2F%2Fwww.freecreditreport.com%2Fpm%2Fdefault.aspx%3Fsc%3D668072%26hmpgID %3D62%26bcd%3DfebemailfooterNO62) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090316/3bd91855/attachment.html>
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