Ric, The touch I've seen with a centered leading, was acting like a brake, or a filter, it tend to push the key in a " preffered velocity mode " that was too perceptible (on the instrument I have tested). This goes for a very even and perceptible sensation of evenness of inertia (weight sensation) but strangely this evenness did not seem to me like it can play a role in expressiveness or musicality of the piano (action). My gut feeling should also to lead a 2/3, only to lessen the lead quantity in the key. I have much more to say about a PDT work I've tested, but it was a somehow extreme job, with capstan moved almost 1 cm on the sharps, 115 spread, so probably not the best example of an installation. Nowadays, it seem to confirm what I was thinking of, meaning the very perceptible sensation of eveness of BW added in the mix something new, that pianists are not really used to but also, it so not mask the unevenness of acceleration that remain in the action. (that mean it may eventually be more disturbing than helping in some cases). Not to say the formula or the method is wrong, it is just a one experience on a particular setup (Schimmel 190 grand - 1978). Best Regards. Isaac OLEG -----Message d'origine----- De : caut-bounces@ptg.org [mailto:caut-bounces@ptg.org]De la part de Richard Brekne Envoye : samedi 20 decembre 2003 00:13 A : davidlovepianos@earthlink.net; College and University Technicians Objet : Re: Touch weight I would agree with your conclusions 100 % David. I am curious tho as to whether you've begun to play around with the idea of trading FWs for key inertia yet. And for that matter...how do you distribute the lead you use to achieve any given front weight, and what are your reasonings for whatever decisions you have. At the moment, I am going for distributing leads about the midpoint between the balance rail and key front... tho a few I know mean that its better to move that out a bit... say 2/3'ds the distance...tho they have been unable to really say why. We do know that we get less key inertia for same FW the closer we concentrate mass towards the middle. Course there is no doubt a practical limit there... but just so. At any rate.. I would be pleased to hear your thoughts on why you place leads where you do. Cheers RicB David Love wrote: > It's simply a guideline. The maximum also does not suggest that inertia > problems suddenly begin once you exceed the maximum. Adding weight adds > progressively more inertia until at some point it becomes objectionable. > That subjective line will vary. As is usually the case, it's a bell shaped > curve. I personally prefer a maximum a bit lower than this; around 80% of > the published maximum, and I am content with a correspondingly lighter > strike weight or hammer. Matching the exact curve is not that important as > long as it's a smooth curve. Encroaching on or exceeding the maximum is > less of a problem at the top of the action where there is less mass in the > hammer and, therefore, less overall lead in the key, than at the bottom. > > David Love > davidlovepianos@earthlink.net > > > There is no where any real documentation that I am aware of that > justifies any > > precise assumptions about Maximum FWs. Indeed... I would think that given > the > > variance possible in key inertia for same FW... such a table would be in > the > > end less then usefull to begin with. In anycase... todays maximum table > is to > > no small degree a subjective opinion... which means any assumptions about > what > > SW is appropriate for any given SWRatio is also equally subjective. > > > > That being said... there is also a good deal of experience and data that > lies > > behind that subjective opinion.... so untill we get further with figuring > in > > Key inertia into this picture.... its a good reference table. > > > > Cheers > > RicB > > > > > > -- > > Richard Brekne > > RPT, N.P.T.F. > > UiB, Bergen, Norway > > mailto:rbrekne@broadpark.no > > http://home.broadpark.no/~rbrekne/ricmain.html > > http://www.hf.uib.no/grieg/personer/cv_RB.html > > > > _______________________________________________ > caut list info: https://www.moypiano.com/resources/#archives -- Richard Brekne RPT, N.P.T.F. UiB, Bergen, Norway mailto:rbrekne@broadpark.no http://home.broadpark.no/~rbrekne/ricmain.html http://www.hf.uib.no/grieg/personer/cv_RB.html _______________________________________________ caut list info: https://www.moypiano.com/resources/#archives
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