![]() This is how most instrument makers make their leadpipes. The steel washer slides over the tube and compresses and stretches it to fit the dimensions of the mandrel exactly. After the tubes are hand drawn, and the tips of them are formed to grip the leadpipe mandrel, I thread the tube and the mandrel on to the drawing machine and pull them through a softened steel washer. The machine I draw the leadpipes with is handmade, and works really effectively. I prepped the 4 failed tubes again and they all succeeded in the final machine drawing. The remaining 4 failed on me because I had not hand drawn the tubes down far enough before drawing them with my drawing machine. ![]() I had 6 leadpipes to make, and the first 2 went perfectly. ![]() Hand drawing doesn't get the tube all the way to final size, but it makes the final process easier. The tubing hardens as it gets worked, so the process of annealing and hand drawing gets repeated about 5-8 times. After they cool, I place them on the leadpipe mandrel that I want to use and I start hand drawing them down to size with the draw plate that is mounted in the vise. Other ways of making a leadpipe are to form it from a flat sheet and braze it together with a seam, or machine a piece of brass rod using custom made drill bits that are extra long, and tapered to the leadpipe specs.įirst I anneal the tubes to soften them. ![]() There are a few different ways to make a leadpipe, and my way is a traditional tube drawing process. Needless to say, I am very excited to get my CNC gear setup and tested!īelow is a run through of the process I use to make my leadpipes. With the aid of my new CNC lathe, making new leadpipe mandrels will be much faster than it used to be, which will allow me to quickly see the results of my ideas. ![]() From my experiments with these tapers, I will be able to narrow down what characteristics they each produce, and then I will design new tapers to try to improve on the first 3. They set up the intonation on the horn, affect the feel and slotting, and also affect the tone.Ĭurrently, I have designed 3 different tapers that cover the spectrum in terms of taper length and taper size. Leadpipes have a very important role in the creation of the sound of a trumpet. ![]()
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