Author: Gordon (NZ)
Date: 2006-12-24 12:14
Clarnibass wrote,
""If I am doing significant work on a clarinet, especially in this area, I modify the geometry of the linkage parts, such that the planes of both the face of the cork, and also the surface that engages the cork, are both tangents to this cylinder at the point of contact"
Do you mean you bend the metal to be convex, and you shape the cork (that is glued on a straight surface) to be concave (or the other way around if the cork is on the opposite side)?"
No, I just adjust the alignment of the linkage tabs to have tangent surfaces as explained. Occasionally, I make the lower tab more convex, by bending, if it is thin, or milling.
This means there is only SLIGHT alteration of the linkage, if/when the bodies are rotated relative to eachother (upper key left further open)
If I were making the upper tab concave, as a suggested IDEAL, I would grind or mill it so, but this was just a suggested ideal. I don't recall doing it yet.
Chris, in your last paragraph, isn't the result dependend on whether the tangent situationh exists? If so...
f both surfaces are convex, then having them misaligned would either cause the upper pad not to close if the top joint is set towards the left, OR the right.
BTW, the student Yamaha I just looked at has both the posts at the bridge the same height.
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The Clarinet BBoard
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