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Discussion in 'Trumpet Discussion' started by RAK, Sep 2, 2009.
YouTube - Trumpets Swiss Made
Is he using lead to bend the tube? starts about 2:35?
Yes he is using molton lead inside the tubing to keep it from crimping when it is bent in the jig. Sometimes pitch is used, and sometimes it is soap water, which is then fast frozen inside the tubing. All for the same purpose.
Oh I see. That is way faster than freezing it over night. I got lots of lead and i have lots of experience with it. After he bends the tube, how does he get the lead out. Does he heat it with a torch again?
You'll find in other industries - like making exhaust pipes - sometimes dry sand is used to stop the tube from flattening in the bend - the mandrels on the bender also help by supporting the sides of the bend, and you'll notice that the tubing is 'drawn' through the bending process (stretched longitudinally as it is bent) generally because the material is thin and soft, and as such flattens very easily.
The alloy used for bending brass is propietary. The alloy melts at below 100 C. The alloy is melted in a hot water bath or hot plate and poured in the pipe. After bending the brass is placed in a hot water bath and it turns to liquid and drops to the bottom of the vat. The alloy is recycled for the next job.
I learned this on a tour of the Getzen factory about 37 years ago.
Could likely be Field's metal:
Field's metal - Wikipedia, the free encyclopedia
Although he may be using any of the above suggestions,modern horns are made using bismuth which liquifies when heated and solidifies at room temperature.Much safer than any of the above.
Thanks for the replies. I think the cheapest and easiest way is freezing the bell with water and soap like in some Getzen video I saw.
Which Swiss factory does the video come from please?
KLASSODERN - Die Musikwerkstatt