The next lathe project was creating a trumpet main tuning slide mandrel. Made of brass, the mandrel is sized to the most common diameter of main tuning slides (0.458"). The mandrel can be used for forming, burnishing, and even some swedging type repairs.
First, I faced one end of the brass rod. Then in a few consecutive passes, I turned the diameter of the brass rod down to the 0.458" measurement. The next step was center drilling and tapping the rod to allow a handle to be inserted into the mandrel. A final cut and facing of the opposite side produced the final product seen below.
Alongside the lathe project was a soft solder job. After filing a brass rod down to fit the arc on a bare trumpet bell, soft solder was used to attach the rod to the trumpet bell. After the initial solder, I had to wipe to tin and hand buff the bell and brass rod brace.
The end result produced a high shine finish with nearly all traces of solder removed from the area surrounding the brace.
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