I've seen some PCB's with components mounted at multiples of 45 degrees (45, 135, etc.) I recently discovered my PCB program (gEDA PCB) supports these, though it isn't a GUI function and you have to run a command. When is it appropriate to mount at these angles? And what about angles of 30 degrees and 60 degrees, or arbitrary angles?
Answer
Another reason would be for indicator or display components. It's not terribly uncommon to see chip LEDs at varying angle to fit the aesthetics of a particular device.
Whatever the reasoning, most SMT machines can places parts at angles without issue.
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