The functions of drilling machines are diversified, as they are primarily used to create round holes in workpieces. Drilling machines move the cutting tool in a linear motion to remove material in a straight line, resulting in holes with consistent diameters. In contrast, milling machines use rotating cutting tools to move along multiple axes, allowing for the creation of more complex shapes and features on the workpiece. The direction of the tool's movement distinguishes the two processes, with drilling being used to create round holes and milling being used for more intricate shapes and features.
How milling machine works depends on the kind of technology you have chosen. CNC milling machines take the design in the form of specially coded files and act according to the instructions. While for the simple machines, operators have to do a lot of tasks by hand ranging from positioning of the workpiece to that of rotary blades. They have to take care of everything because even a minor error might wreck everything.