Final answer:
A jointer is the best machine to make 1 edge and 1 surface square and clean in woodworking.
Step-by-step explanation:
The machine that will best make 1 edge and 1 surface square and clean is typically a jointer. A jointer is a machine used in woodworking that flattens and straightens the edges and surfaces of lumber. It works by running the board over spinning knives, ensuring that one surface is flat and the adjacent edge is square to that surface. For more precise or larger-scale work, sometimes a combination of machines, including a planer for achieving uniform thickness, can be used in conjunction with a jointer.