While the friction created by deviation from the line (point of convergence of the arcs) may not be measurable, it may still be significant over time in the wear created on the felt, leading to accelerated "lowering of the hammer line" and to more friction down the line when the felt becomes more cupped. The tiny movement of the jack tender's nub against the letoff felt seems insignificant until it wears a hole in the felt, creating regulation problems. The major friction in the action, though, is knuckle to jack/rep top, which is far from the convergence point except in Overs' design. I wonder if altering the wipp heel/capstan relationship slightly away from convergence is significant seen in light of what is happening at the jack/rep knuckle interface. Is there really a significant leverage change in an off center heel/capstan, when compared to the leverage change occurring at knuckle/jack/rep? And is that leverage change significant to touch? I have no opinion, just asking the question. A comparison of Over's action with standard would seem to have the possibility of showing what, if any, perceived differences there were between a leverage gradient and the relative lack of one. Of course, the friction parameter is changed as well, muddying the waters. Regards, Fred Sturm University of New Mexico fssturm at unm.edu On Sep 12, 2006, at 5:41 AM, Ric Brekne wrote: > Bob writes: > > >>One can't argue that the principles > > calling for the magic line are correct, but in reality I've never > been able > > to detect an increase in friction in an action that deviates from > the magic > > line.<< > > Hi Bob, JD, et al. > > I have not been able to notice a friction change connected to the > magic line either. -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/20060912/dbc645ce/attachment.html
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