Thanks much, Bob. Clyde --- Bob Hull <hullfam5@yahoo.com> wrote: > Clyde, > > David Stanwood has written articles in the Piano > Technicians Journals that explain this metrology for > measuring touchweight. If you have access to back > issues of the Journal look these up and read, and > reread and reread... > > Also, you might get a little additional info by > searching the archives of this list. Look for > postings by keywords such as Stanwood, touchweight, > strike weight and balance weight. > > The guild will sometimes have classes taught by > David > Stanwood at the convention. It seems to be time for > this to be offered again. > > Bob Hull > --- Clyde Allen <tunepiano1@yahoo.com> wrote: > > > Hello Bob, > > Where can I find definitions and how to measure > > these various quantities you folks are discussing. > > It sounds very interesting but I am in the dark! > SW, > > DW, UW, FrontW, WBW etc... etc... etc... Thanks > for > > your reply. > > > > Clyde Allen > > Silver Spring, MD > > > > > > Bob Hull <hullfam5@yahoo.com> wrote: > > Hi Richard, > > > > Thanks for your reply. > > > > you wrote: Stanwood suggests given SW curves for > > > each Ratio and BW... > > > tho you dont see that on most of the Smart > Charts > > > published. > > > > > > If you give us some more specifics, perhaps we > can > > > offer better advice. > > > > Where are these sw curves suggested in correlation > > to > > particular ratios and BWs ? You referred to a > number > > 10 curve. I'll give some more details here about > > this > > action. This is with the new hammers. > > > > N SW D U BW FrontW R WBWAvg. > > > ___________________________________________________ > > 1 12.1 56 27 41.5 37.5 5.7 9 > > 2 11.6 56 27 41.5 32.9 5.6 9 > > 9 11.5 50 23 36.5 39.0 5.78 etc. > > 10 11.7 53 28 40.5 32.6 5.4 > > 16 11.4 48 20 34 40.8 5.7 > > 17 11.1 48 21 34.5 37.1 5.6 > > 28 10.8 48 25 36.5 32.1 5.5 > > 29 10.4 44 19 31.5 35.2 5.5 > > 40 9.7 31.6 > > *(40 10.8 48 26 37 31.6 5.5) > > 41 9.6 40 17 28.5 33.1 5.4 > > 52 9.5 44 22 33 29.2 5.6 > > 53 9.3 46 21 33.5 27.2 5.5 > > 64 8.3 46 27 36.5 20.3 5.7 > > 65 8.2 44 26 35 19.3 5.5 > > 87 6.6 49 29 39 6.8 5.5 > > 88 6.4 50 34 42 3.5 5.7 > > > > (*C40 had 1.1 g temporarily added to the hammer) > > > > Do I understand that BW should be fairly constant > > across the keyboard while SW, Frontweight and > > downweight are going to smoothly decrease? > Although, > > downweight may just decrease from 52 to 48. > > > > Also, for good tonal projection is a sw of 12 > > enough? > > > > I hope this info will help you advise me if you > > don't > > mind. Thank you. > > > > Bob > > > > > > > > > Hi Bob > > > > > > You dont really leave us much to go on here to > > offer > > > any real advice. > > > One of the great assets of Stanwoods method is > the > > > whole slew of terms > > > and definitions that allow us to easily converse > > > about and understand > > > any given touchweight situation. You mention a > 5.5 > > > ratio as an optimal, > > > and that you are having problems dealing with > > > appropriate Frontweights > > > for a given Strikeweight curve.. without > > mentioning > > > what that curve is. > > > > > > To begin with... A 5.5 ratio will yield a number > > 10 > > > (if I remember > > > right) curve assuming a 9.0 whippen radius > weight > > > and a 38 gram BW. > > > This will also yeild the maximum Front weights > > > published in the Stanwood > > > kit. > > > > > > From that perspective... it doesnt really matter > > > which you do first.. > > > All that matters is that you do your diagnostics > > > right and arrive at the > > > correct Balance Weight Ratio... (SWR). > > > > > > > > > The point is... when you know your Ratio, have > > > decided upon your desired > > > BW... the rest is more or less given. You can > > > juggle SW curves if you > > > want... but > > > > > > Cheers > > > RicB > > > > > > > > > Bob Hull wrote: > > > > > > >These are questions about component touchweight > > > >balancing with the SmartChartTM. > > > > > > > >I have put new hammers on an action and I'm > > working > > > on > > > >getting the strike weight smoothed. There are a > > > good > > > >many keys that exceed the front weight ceiling. > > The > > > >leading doesn't "look" excessive like some > > leading > > > >I've seen before. > > > > > > > >A strike weight ratio of 5.5 is what I > understand > > > to > > > >be best for this piano. > > > > > > > > > > > why... specifically ? > > > > > > >Should the front weight issue be adressed first > > > even > > > >if it has to be adjusted again? The strike > > weights > > > >will need to be adjusted mostly upwards. > > > > > > > >I'll appreciate your comments. > > > > > > > >Bob > > > > > > > > > > > > __________________________________________________ > > Do You Yahoo!? > > Tired of spam? Yahoo! Mail has the best spam > > protection around > > http://mail.yahoo.com > > _______________________________________________ > > pianotech list info: > > https://www.moypiano.com/resources/#archives > > > > __________________________________________________ > > Do You Yahoo!? > > Tired of spam? Yahoo! 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