Gene, I encountered this on 3 Weber (Young Chang) grands I walked in on in practice rooms a few months back. I hadn¹t regulated them. David Anderson correctly steered me to the solution: proper jack-to-knuckle alignment. I never realized that a jack regulated too far back, in addition to messing up the touch, could be that noisy! Best, Paul -- Paul Milesi Registered Piano Technician (RPT) Piano Technicians Guild (202) 667-3136 (202) 246-3136 Cell E-mail: paul at pmpiano.com Website: http://www.pmpiano.com Address: 3000 7th Street NE, Apt. 204 Washington, DC 20017-1402 From: Gene Nelson <nelsong at intune88.com> Reply-To: <pianotech at ptg.org> Date: Sun, 28 Feb 2010 19:27:46 -0800 To: <pianotech at ptg.org> Subject: [pianotech] hammer return noise Having a difficult time reducing hammer return noise on a piano with new Tokiwa whips & shanks, new hammers, key capstans, back checks, key pins and bushings, front and balance rail punchings, key buttons, and key end felt. Key frame is properly bedded. Action is regulated. All action frame joints and screws are solid and tight. All action parts screws are tight. All centers are at optimal friction with no wobble. All hammer glue joints are solid. All whippen glue joints are solid. Hammer rest rail has new felt, is adjusted at correct height and nuts are tight. Key stop rail has new felt and is adjusted for minimal up key movement. I have checked the knuckles - the core is firm dense felt and a needle easily goes in from the side. Buckskin is not too tight over cores. I have had minimal to zero results using my sugar coater on the knuckle buck skin. I can depress the key about 2mm, release it and give a slightly woody clunk upon return. Noise is a bit louder when hammer falls after releasing from check. Happens on the bench and when secured in the action cavity. It is noticeable when playing especially in the upper treble section with lid closed but the noise exists in the lower parts as well but not quite so noticeable when playing. Any ideas would be helpful. At some point I should just give up and accept it as normal action noise? Thanks for your thoughts. Gene -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100301/3d5d2cbe/attachment.htm>
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