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 Topic: Replacing Water Tube in Wing Joint
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motomom
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| Posted: August.14.08 at 10:40am | IP Logged
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OK, I have a band director who is insisting that I replace a broken-off water tube in one of his bassoons. He wants me to do the job, and doesn't care if it doesn't come out perfectly. I have made him understand that it will be the first one of these that I have done.
Has any one of you done this, and can you give me some pointers? I am unsure about the best way to remove the old water tube, obviously I don't want to damage the wood around the tube.
Even though I quoted him a very high price, he pointed out to me that it is still better than buying a new maple bassoon. :(
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bobbaier
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| Posted: August.18.08 at 6:19pm | IP Logged
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I assume you're dealing with a hard rubber or plastic tube, not metal. You don't mention the brand, but if you can get a replacement tube from the manufacturer, that's the way to go.
If not, I would measure the inside diameter of the tube with pin gauges to be sure of what I needed to end up with. Look on the inside of the joint and see what you need to end up with there. Then, I'd drill it out in two or three steps.
If, like me, you don't have a jig to hold a bassoon in a drill press, I've had good luck using sand bags. You can get just about any angle you need and it's pretty stable. Put a piece of drill rod that fits snugly in the tube in the chuck and use that as a guide for the correct angle as you set up the sand bags.
Then, it's a matter of gluing in the tube with the correct projection inside or making a tube and gluing.
By the way, for removing metal tubes, you can heat a piece of rod and insert in the tube to soften the glue and then thread in the appropriate tap to grab the tube and pull it out. Of course, you will replace the tube.
That's my approach, but I'd probably call Chip Owen at Fox before doing it to see if he knows of an easier way.
bob
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motomom
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| Posted: August.19.08 at 10:17pm | IP Logged
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This looks like hard rubber or plastic, and it is on a Schrieber bassoon, so I doubt that I can get the part. It is broken off (3rd finger LH) and so your finger cannot seal the hole under the ring.
I tried building it up like a clarinet chimney replacement already, but it broke off again in no time.
I have a pretty good sized chunk of delrin that I can make a new tube with, I'm pretty good on the lathe. I'm just unsure about how to get that old tube out without a problem. I'm going to try some of this stuff and see if it works. 
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bobbaier
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| Posted: August.20.08 at 3:56am | IP Logged
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I don't know if this is an accepted procedure, but in a case like this, I don't know why you couldn't counter bore the tube and just replace the top inch or so.
You'd need a counter bore and pilot of the correct diameter to end up with a flat bottom to the hole. Glue the insert in and drill/ream it to the final ID after it's in place.
bob
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admin
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| Posted: August.31.08 at 7:33am | IP Logged
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So, how'd it go motomom?
Michelle
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motomom
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| Posted: November.19.08 at 10:00pm | IP Logged
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I ended up doing as Mr. Baier suggested, and just replacing the top 1/2 inch of tube and the little part that sticks out. Sorry I didn't get a picture, but kiddoe was waiting on it and it is back in student hands now. We'll see how it holds up, at least I know it is being tested!
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