It's not the knuckles nor the key bushings. Thanks >From: Steven Coolidge <stevenc@calweb.com> >Reply-To: pianotech@ptg.org >To: pianotech@ptg.org >Subject: Re: Noisy Yamaha action >Date: Mon, 12 Feb 2001 09:56:02 -0800 > >Did anyone mention putting teflon on the knuckles? That is the cause of >the "click first time" effect on grands in my experience. > >Steve > >At 05:15 AM 2/11/01 +0000, you wrote: >>List: >> >>I'm working on a Yamaha C5 c1979. I just replaced the hammers and shanks. >>Piano sounds great. But, the action is very noisy. Two types of noises >>seem to be there: First, there is a sort of click that one frequently >>hears when a note played or even tapped. Interestingly, the noise does >>not occur if you keep playing the note, only on the first blow. In a >>discussion with another tech, he informed me that some Yamaha keys tend to >>leach sap onto the balance rail pin creating a sticky residue that (when >>the pin is too tight) makes a noise (clicking type) when the key is first >>played. The noise does not continue with repeated blows because the >>contact has, in effect, been broken. Once the key rests for a bit, this >>contact sets up again and the noise will again be heard when the key is >>next played. Some of the balance rail pins are, in fact, a bit tight. I >>have not heard this theory before and would be interested in some comments >>if there are those who have. I can certainly ease at the balance rail, >>but if this noise is in part because of some sort of residue, what can the >>pins or key be lubricated with that will have a positive effect. I >>normally lubricate the pins with McClube (and these pins have been >>lubricated), so I suppose my question is what would you lubricate the >>balance rail hole in the key with. >> >>Second, there is a fair amount of side to side play in the whippen flange >>and I when I push the repetition spring from the side it makes a slight >>click where it enters the back of the jack tender. Aside from addressing >>the problem at the balance rail, my first thought was to repin the whippen >>flanges and lubricate the lower part of the rep spring with some Protek >>grease type lubricant. My second thought was to replace the whippens. >> >>Note: The problem is not loose weights either in the key or the damper >>flanges (noise continues even with dampers lifted out of the way). >>Backrail cloth and cloth on the heel of the whippen are fine. Leather on >>the balancier is not hard. Hammer flanges are fine, and the hammer/shank >>glue joint is solid. >> >>P.S. Though the action is somewhat "rattly", I realize that actions do >>make some noise and that eliminating all of it is difficult if not >>impossible. >>Nevertheless, this customer is sensitive to extraneous action noise and I >>would like to get it as quiet as possible. >> >>I appreciate your comments. >> >>David Love >> >> >>_________________________________________________________________ >>Get your FREE download of MSN Explorer at http://explorer.msn.com > _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com
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