Center Hinge Screws with a Countersink
Centering screws in hinges can frustrate even a veteran cabinetmaker. It's impossible to do by eye, and if you're only doing a couple of doors, you probably don't want to buy a special self-centering bit to help with the job.
After mortising the hinge into the panel, chuck a countersink bit into your drill and drill into each of the screw holes. Be careful not to enlarge the screw holes or dull the countersink. The lowest point of the countersink is the center of the screw hole.
—from the WOOD® magazine shop