I have a question for all my fellow machinists and manufacturing nerds on here!
In the core of a lock there's the keyway, which commonly has a awkward prismatic shape, open on the top, and with the invers cross section of the key. How is that shape manufactured?
The only way I could think off is with a broach, but that seems horribly high effort in manufacture. And (some) locks are cheap, and they still have weird keyways.







