The origin of the word rigid is English – rigit and the exact equivalent of the Turkish word is hard – hard. When describing the features and working processes of CNC machines, rigidity or rigidity definitions are used to express that the machine components have sufficient hardness / strength in the processing of even the hardest metals. For example, in a CNC Panel Machining Center, in order for pure aluminum sheet to be cut or jointed, the machine body, the skids, the cutter piercing milling cutters that give the parts the possibility of movement, the collet – tool holder – spindle motor must have high strength, respectively, and the spindle motor – spindles must have sufficient high speed and torque. The word rigid is used to refer to the adequacy, strength and strength of this machining process.