The evidence points to it and yes it happens all the time. You have a piano that's heavy, no friction problems (that you report) maxed out key leads (it appears). If it walks like a truck. There have been several suggestions. If the problem exists I'm more inclined to consider moving the capstan first but it requires some calculations and testing. One thing I wanted to mention about Jon's solution, which is also a worthwhile consideration, is that when you move the knuckle out to 18.5 mm with strike weights that are on the medium to lighter side, then you better be prepared to repin the balancier otherwise you won't be able to put enough tension on the rep spring to keep it from throwing the hammers into the strings and still get good return on the jack. Even at 18 mm it's a problem as I've found when using some Abel shanks designed at 18 mm for some pianos (MH for example). The problem in these situations is teaching the customer about the problem, why it exists on a new piano, and why they should have to spend what's necessary to fix it. A new definition of aftertouch. David Love www.davidlovepianos.com From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Patrick C. Poulson Sent: Saturday, January 30, 2010 7:17 AM To: pianotech at ptg.org Subject: Re: [pianotech] Weighing Off A Schafer Grand David, Jon, Wim: It seems that you all are suspecting action geometry as the problem. Moving the stack, relocating knuckles, and moving the wippen rail - all things I have never encountered before. I am wondering if anyone has had this kind of problem with Schafer grands before, or is this an isolated case? Patrick C. Poulson Registered Piano Technician 530-265-1983 ----- Original Message ----- From: David Love <mailto:davidlovepianos at comcast.net> To: pianotech at ptg.org Sent: Friday, January 29, 2010 6:07 PM Subject: Re: [pianotech] Weighing Off A Schafer Grand Symptoms seem to point to poor leverage. Sounds like there's already too much lead. Take upweight and downweight samples on 10 - 15 notes through the scale and post it. Also how many leads in the bass, mid tenor and treble and approximately where they are located in reference to the balance rail (closer to the BR or closer to the front) David Love www.davidlovepianos.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100130/7ea0332f/attachment.htm>
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