Trumpet Factory Tour 3

Machining and hole formation

Brazing

Boring

The valve is a very important component which can be almost thought of as the heart of the trumpet.

Machining and hole formation
In this step, holes are drilled in precise locations.

Brazing
In this step, the valve casing parts are fitted into a special jig and passed through a furnace to braze the components together without any distortions.

Boring
In this step, a lathe is used to precisely machine the interior of the brazed valve casing. This step involves machine work and is critical for ensuring quick, smooth piston action.

The gap between the valve casing and the piston is set to 10 microns on one side. This is such a high level of precision that the valve will not work if even a single strand of hair becomes trapped in the gap.
* 10 microns (0.01 mm) is about one-tenth the thickness of a single strand of hair.

Machining and hole formation In this step, holes are drilled in precise locations.
	Brazing In this step, the valve casing parts are fitted into a special jig and passed through a furnace to braze the components together without any distortions.
Boring In this step, a lathe is used to precisely machine the interior of the brazed valve casing. This step involves machine work and is critical for ensuring quick, smooth piston action.