What does "precision-machined" mean?
"Precision machining" refers to the technical manufacturing process of making large pieces of material smaller, to be able to fit together the pieces in a more precise way. In simpler terms, it refers to the process of taking excess, raw material to shape them into exact, precise parts. The speaker is referring to this process in the video, and has used "precision-machined" as a verb to describe how the iPhone product is made. Ex: The factory placed a lot of attention on precision machining. Ex: Precision machining is an essential process for all electronics manufacturing.