How a Trumpet is Made
Manufacturing the pistons

1. Broaching

Holes are bored precisely in six locations on each of the three pistons.

Broaching

2. Brazing process

Tubes which will serve as three distinct pathways for air are brazed into the holes in the piston tube.

Brazing process

3. Precision grinding process

The outer diameter of the brazed tube is then ground to an accurate cylindrical shape.

Precision grinding process