A CNC router is very similar in concept to a CNC milling machine. He went on to work as a milling machine operator. Mill drills are a lighter alternative to a milling machine. Installed on the quill of a milling machine (hence its name). Woodruff keyways can be produced on a milling machine. The crouched figure was recovered after being partially damaged by a milling machine in 2011. The advantage of having a CNC milling machine is that it protects the machine operator. A "wiper insert" is an insert used in a milling machine or a lathe. Therefore, no one person can properly be described as the inventor of the milling machine. Eli Terry was using interchangeable parts using a milling machine as early as 1800. Facing on the milling machine involves various milling operations, but primarily face milling. The use of a milling machine adds costs that are factored into the manufacturing process. Diana Muir believes that North's milling machine was online around 1816. In 1783 Samuel Rehe invented a true milling machine. A hobbing machine is a specialised milling machine.