whirring

Bob chats against the buzzing backdrop of whirring industrial tools and woodwork machines in the next room - a laser cutter, bandsaw, lathe and a 3D printer among them.

His motorized wheelchair whirring to life, “Rocket Rod” Foster uses the joystick attached to the end of an armrest to roll forward inside his West Los Angeles apartment.

Once the pages are printed, they are trucked to a nearby bindery and fed into a whirring machine of conveyors, choppers and hot glue.

A continuous high-pitched din — a bit whirring, a bit crunching — echoed over the Bottom, the residential sliver of Braddock, Pa., nearest to the industrial plants and the Monongahela River.

I can hear the espresso machine whirring outside.