CNC Machining is a subtractive manufacturing method where in a piece of round or rectangular metal stock is started with and milled to the spec of the desired part. When working with square/rectangular stock the material is in a fixed position, usually in a vice or mounted to a jig and the platform is on can move in the X and Y directions, and the tool which is attached to the spindle can move vertically in the Z direction to cut and mill the pieces of raw material. In CNC turning, the material is held in place by a chuck, which is attached to a spindle and the spindle turns the material at high revolutions per minute. The cutting tool which is stationary, then cuts and mills the turning piece of material.