A structural aerospace component can start its life as a billet of aluminium weighing more than a tonne and finish as a finely machined part weighing under a hundred kilos. The rest leaves the machine as a mountain of chips.
At first glance, that looks wasteful. In reality, it is how some of the most demanding airframes in the world are built. The method is called solid billet CNC machining, and for primary structural parts on modern aircraft, it remains the default choice. Continue reading

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