 The Clarinet BBoard
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Author: Bill
Date: 2001-04-08 12:38
What methods, besides pinning, are used by clarinet technicians to repair upper/lower joint cracks that go all the way to the bore? In particular, I'm thinking about the repair of thinner walled clarinets like soprano C and soprano Eb.
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Author: jbutler
Date: 2001-04-08 13:05
Pinning and flush banding are the most common. There is some movement for fillers such as cyanoacrylate products. Most of these fillers become brittle over time and begin to leak again. Bell cracks are usually repaired with cyanoacrylate. Back in the old days musicians would fill cracks with hot wax. It worked.
John
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Author: Bob Curtis
Date: 2001-04-10 01:21
Bill:
The only other thing I could thimk of and don't know if it would be successful would be to sweat a band of silver around the area so it would draw the wood together. My wife had an oboe split on her one cold winter day and the repair man had to pin and add the rings to it to solve the problem. Get a good repair man and ask him what he thinks and then if you are not satisfied, ask another one.
Bob Curtis
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Author: Gordon (NZ)
Date: 2001-04-11 07:49
How would you keep the band really tight while doing the sweating. The result must be under tension in order to hold tight. The flush banding is the standard method of using a metal ring. It is compressed into a groove using a press.
A possible modern method would be to machine a groove, put black epoxy binder in it, and before the epoxy sets, wind carbon fibre thread around it. I haven't tried this - yet.
If an instrument is flushbanded and the timber then shrinks in a different climate I presume you would have a loose flushband to contend with.
If an instrument is pinned and then shrinks the pins will hold the part of the timber secure and create large splitting stresses elsewhere, probably at the ends of the pins or the bore under the pins.
Does anybody have experience of these phenomena actually occurring?
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