I'd be interested in how you do that to get some sort of consistent tension? David Ilvedson, RPT Pacifica, CA 94044 ----- Original message ---------------------------------------- From: "David Love" <davidlovepianos at comcast.net> To: pianotech at ptg.org Received: 5/10/2009 8:14:12 PM Subject: Re: [pianotech] Hammer Line Issue >That does bring to mind and experience recently with a Schimmel where I had >the same problem. The keys were bobbling and after checking through the >regulation I came to that conclusion noticing that the action was quite >stiff when played without the pedal engaged. Releasing tension from the >spring not only cured the bobbling problem but also made the action much >more pleasant to play in the process. No ill effects from reduced spring >tension with respect to damping efficiency. > >David Love >www.davidlovepianos.com > >From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf >Of pmc033 at earthlink.net >Sent: Sunday, May 10, 2009 7:52 PM >To: pianotech at ptg.org >Subject: Re: [pianotech] Hammer Line Issue > >On many new pianos coming from overseas, the damper springs are definitely >too strong. If the tension on the spring is too strong, it can reduce the >momentum of the key enough to prevent checking at the end of the stroke. If >one doesn't press the key firmly to the bottom of the stroke, the result is >that the hammer doesn't go into check. I had a customer that purchased a >Chinese piano, and it had bobbling hammers. The customer played very >softly. No matter what I tried, on some notes the bobbling wouldn't stop. >When I finally relieved some spring tension from the dampers, the problem >was solved to a great degree. The dampers did work properly, even with >reduced spring tension. Obviously, one has to be careful not to weaken them >too much. And, yes, all the other options should be tried first. I believe >this is indeed a dynamics issue, since the resistance felt at the key gives >a false impression that one has completed the key stroke. It makes soft >play without bobbling almost impossible. > Paul McCloud > San Diego >
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