What is Plain Milling?

Plain milling, also called slab milling, is a subtractive manufacturing processㅡwhich means it involves removing portions of material from a workpiece to form the desired product. However, unlike the conventional subtractive manufacturing process, the process requires that the rotating axis of the cutting tool is parallel to the surface of the workpiece.
In plain milling, the workpiece is usually fixed on a worktable. This worktable moves and feeds the workpiece against the cutter, allowing machinists to create a plain, flat, and horizontal surface parallel to the axis of the cutting tool.