I just have one question, Richard. How was the aftertouch before you started? Are you setting the key dip to some pre-conceived idea? I agree, 9mm is really shallow, but I would have checked blow distance and aftertouch before just going with some pre-printed specs. I doubt that this is the cause of the "clacks" though. Probably the underlever stop rail is too high. Black keys are notorious for having a deeper dip, and raising the dampers higher as a result. I wish I could see it. My technique for diagnosing problems, when it comes right down to it is this, and it's really simple to remember; Start at the front of the key and move back, following the sequence of events, go up through the whippen, through the hammer-shank assembly, to the strike point. That sequence at least gives you a system in which you can diagnose the problem without leaving out the thing that you refuse to see. ----- Original Message ----- From: "Richard Brekne" <Richard.Brekne@grieg.uib.no> To: "PTG" <pianotech@ptg.org> Sent: Tuesday, October 16, 2001 2:26 PM Subject: A real Nut > List > > Ok... perhaps someone is going to nail this one right away... but it > took me a bit to figure out. Still I got it in the end... > > I was setting key dip today on my favorite Grotrian, been meaning to get > around to this for a while as the dip was waaay to shallow and had > caused some regulation creativity problems. (around 9.0 mm, perhaps even > a bit less). Anways I roughed em in around 10 mm zip and started doing a > few checks and right at the break between tenor and treble I ran into a > couple black keys that made this really loud clacking sound when played > hard. > > So you tell me.... what was the problem and solution ! > > -- > Richard Brekne > RPT, N.P.T.F. > Bergen, Norway > mailto:rbrekne@broadpark.no >
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