Unfortunately, the word "bore" has a very specific meaning in the metalworking world. It refers to the hole forming method done with a boring bar on a lathe or with a boring head on a mill. Referring to a trepanning operation as "boring" will cause confusion.
Take a look at the flywheels on this engine...
Each flywheel is cut from the solid. The process of removing the material between the hub and rim to form the web is called trepanning.

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