Yamaha does this test strictly with finger across the rep top. Run your finger along a piece of paper lying on a surface. That is the feel you are looking for. Yamaha doesn't think it is that important in the scheme of things. If it feels lower than that and looks like it, you may have too low rep tension. Check the pinning on a rep lever. Some are advocating 6 grams friction. If you've got 0 or little, try repinning and re-regulate the rep tension for hammer rise. That will give you more power in the jack return. Don't tap the jack lever, hold between two fingers and move it back and forth. What you really want is to feel some friction there with a little hammer movement. Key is the same friction feel from one to the other. You also need to be looking from the side with the neighbor hammer up out of the way. The jack needs to return under the knuckle. You wink the jack and watch for return. If the jack doesn't return, the rep lever is too low. You let go of the jack for the return.
David Ilvedson, RPT
Pacifica, CA 94044
Original message
From: KeyKat88 at aol.com
To: pianotech at ptg.org
Received: 2/12/2009 3:25:10 PM
Subject: [pianotech] jack test / "winking" hammer
Greetings,
What if when you go to check the jack clearance by tapping the jack toe and the hammer winks down a little more each time you wink it? I set the rep lever higher, and gave the jack more clearance under the knuckle, but now the jack looks and feels too low in the rep lever window (more than 1/64") This is my fourth grand regulation.
Can a rep lever ever be set too low, even though the hammer winks properly? What's with the hammer going lower each time the jack toe is tapped?
Julia Gottshall
Reading, PA
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