Too little lost motion is what I thought when I read the post, buy since you say the regulation is correct, I didn't reply before.? I see a lot of Yamaha's in the local schools here in Maine, and I'm always cranking up capstans, then six months later cranking them back down.? So I'd give a little tug back on the hammer rail just to see if the butts are being held (ever so slightly) off the rail. Gordon Large, RPT Hallowell, ME -----Original Message----- From: William R. Monroe <pianotech at a440piano.net> To: Pianotech List <pianotech at ptg.org> Sent: Tue, 18 Mar 2008 9:56 pm Subject: Re: Yamaha jack question (I figured...) So, if you file it under unexplained mysteries, what does that do for your client? ? Sheesh, Terry, give us a minute.? Probably not too tough to figure out if the action is in front of you, but in cyberspace a bit more challenging. ? You said it was in proper regulation.? How much lost motion was there?? On a slow release of the key, does the jack reset properly?? Without more diagnostics, my first instinct is that the jacks are hanging on the butts because there is not "enough" lost motion - e.g. clearance for the jack to return.? ? ? William R. Monroe ? From: pianolover88 at hotmail.com To: pianotech at ptg.org Subject: Yamaha jack question Date: Tue, 18 Mar 2008 15:42:42 -0700 Customer owns a yamaha console, only about 11 years old with minimal use. Got a call that some keys were sticking. Upon inspection I confirmed quickly that the problem was *not* in the keys, but the jacks. Turns out that many of the jacks (plastic) are having trouble resetting back under the hammer butts for some reason. This happens whether the damper is depressed or not, when repeating the same notes at a reasonable speed, but less than trill.? A check of the action determined that the regulation is correct, the centers are not tight, the hammer butt buckskin is not worn at all, and the jack springs are not the problem. I also noted that the top of the jacks have sufficient slickness/graphite. So what could be the source of this problem? The backchecks are also properly regulated. Should I try spraying McLube on the tops of the jack, then brushing on some powdered teflon? Could it be that the jacks being plastic could be part of the problem? Terry Peterson Connect and share in new ways with Windows Live. Get it now! Shed those extra pounds with MSN and The Biggest Loser! Learn more. -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20080318/fa797f23/attachment.html
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