Author: johnt
Date: 2008-04-25 14:09
Joshua +2 tips are fragile! Make sure you hold the tip upright & put no pressure on the ear itself while shaping. The ears have a nasty habit of breaking off the tip while you shape cane. I begin just below the ear, shave off cane not all the way to the metal on the first pass, then I go back right under the ear & smooth up the rough edges down to the metal. I've had two Joshua +2 tip ears break off on two tips. Fortunately, the vendor stood by the product & replaced them each time at no extra cost to me. Recommend you get them from Ann Hodge. She has an extensive website. The little suckers are expensive. $225 is the going rate.
The trick is to get the cane to match the oval tip of the staple as closely as possible. If you tie shorter than the discussed lengths, the cane tends to "bunch" at this point, rather than marry to the oval at the tip of the staple. This creates unwanted air pockets at the sides which tend to make the reed go a bit wild. So the crossover wrap needs to cinch the cane to the oval without creating those pockets either side of the reed & without going beyond the end of the oval tip of the staple. It's the Bernoulli effect coming into play here. The air molecules are rushing at a much greater speed through the constrictive oval staple tip although at lesser pressure, creating equal & greater pressures either side of this narrowest point. If pockets are there, they play havoc with the air pressure just past the narrow point through the cork end of the staple & into the oboe or EH. The result of course is off notes which sound unsupported. IOW, the pockets, if present, create an undesirable obstruction to the air under pressure. Not a good thing.
Best,
john
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