Hello, Renner spec. for the flange pin is more 2-3 g, that is may be why you find these values. when they are exercised the action center will free a tad, so it may be a good idea to move them back an forth a few time before really using the gram jauge. Best regards. Isaac OLEG > -----Message d'origine----- > De : pianotech-bounces@ptg.org > [mailto:pianotech-bounces@ptg.org]De la > part de Phillip Ford > Envoye : mercredi 14 janvier 2004 21:38 > A : pianotech@ptg.org > Objet : Re: action centers > > > > At 12:18 PM 1/13/2004, you wrote: > >i forget. is it always a good idea to check resistance on > all action > >centers and re-pin, if necessary, even if all the parts > are brand new? > >as i've mentioned before, i'm working on a baldwin sd-10. > >and another thing, this was my second hammer filing ever, > and i seem to > >have taken slightly too much felt off. so i have a slightly uneven > >hammer line in the bass section. > > > >daniel carlton > > Daniel, > > I'd say that looks a lot better than the second hammer > filing that I > did. Did you individually file the hammers? With new > hammers I generally > tend to gang file the hammers (take a strip of sandpaper > wide enough to > sand about 4 - 6 hammers at once). My intention is not > really to take off > a lot of felt but just to clean off the outside layer and > to remove any > cupping that came from cutting apart the hammers. By the > way, when you > say an uneven hammer line, I assume you mean that the hammer tops > would not form a straight line when the shanks form a > straight line. I would > correct this in the regulation - make the hammer line > straight, and let the shank > line be a little uneven. Probably not better technically > speaking, but some > people will take notice that the hammer line looks sloppy > if you leave it that way. > > I think it's always a good idea to check every pin in the > action, even on > new parts. How particular you want to be about it depends on your > particular standards, the particular situation, and how > much you're getting > paid. My experience lately with new parts is that the > pinning is not very > consistent and is often not what I consider acceptable for > an exacting > application. Your mileage may vary. If I was doing prep > for a dealer, > with what they generally pay, I would just check the pins > in the action to > make sure that they were not extremely loose or extremely > tight - for > example, lift up groups of hammers and let them drop to see > if there are > any excessively tight ones, and run my finger along the > shanks at the > hammer head end and see if there's any excessive free play > - see if the > jacks are free and return quickly, see if the whippens > swing freely, > etc. If I saw any particular problem I would address those > individual ones. > > If I'm getting paid lots of money to properly rebuild > someone's piano, then > I take an accurate gram gage (such as a Correx gage) and > check the friction > on every pin. I want them to be consistent within some reasonable > tolerance. As an example, I'm currently putting new action > parts on a > Steinway. I'm using new Renner parts (which as you > probably know cost > hundreds of dollars). To take just one pin as an example - > the wippen > flange center - I want to see 5 grams on the gage when the > flange starts > moving when I put the gage arm next to the screw hole. > I'll accept 4 - 6 > grams. What I see from measuring the new parts out of the > box is from a > fraction of 1 gram (will barely move the gage) up to 10 > grams. If I > installed the parts on the action out of the box and > checked them, the > wippens would all appear to move freely. However, there would be a > significant variation in pin friction. Pretty > disappointing after spending > hundreds of dollars, but seemingly a fact of life these days. > > Am I being too picky? Perhaps. If you look at that pin by > itself, could > the pianist feel a difference between a wippen flange > friction of 1/2 gram > and 10 grams? Maybe, maybe not. But if you take the sum > of all the variations > throughout the action that are not dealt with, then yes, a > good pianist can > feel the difference. I go to a lot of trouble to smooth > the hammer strike > weights, properly align wippens to knuckles, finely > regulate, etc., etc. to > try and achieve an even touch from note to note. Doing my > best to make > sure that pin friction is consistent just seems like part > of that process > to me. Some sets of parts are better than others. On some > sets of parts, > I've had to replace 3/4 of the pins to get the consistency > that I want. > > Regards, > > Phil Ford > > > > > Phillip Ford > Piano Service and Restoration > San Francisco, CA > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives >
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