I need to make good round 3 inches hole in the wooden cabinet (see blue circle) to pass feed and load wires to a subpanel I'll put outside the cabinet.
What's the best way to make that hole? My carpenter planned to just hammer it with nail to create rough hole but it is not pure hard wood and I'm afraid the impact may make the cabinet misaligned. Is there a better way? Can I drill around the circle circumference with a small metal or concrete drill bit? What do you do?
Best Answer
Use a 3" hole saw or closest metric size on a drill. 3 inch hole saw
Use whatever tools you use to make a round hole in a door for a lock.
EDIT
What is on the other side of the cabinet where you want the hole? Is it open space or is it against a wall? I would say that pounding a nail repeatedly around a 3" diameter hole would likely damage the cabinet and maybe pull it apart at the joints. The right tool would be what used to be called a "keyhole saw" but is now usually called a "jab saw" (shown in the another answer, currently deleted). This tool is commonly used for drywall but can be used on other materials. You would drill a hole (say 3/8" or 1/2" diameter just inside the 3" circle and start sawing there. Best jab saws