Glass and mirrors used in furniture like drilling of screw and handle holes on glass doors, glass panels is carried out on CNC machines. At this stage, glasses are drilled with or without countersinks with drill bits of different diameters. All glass and mirror processes like perforated glass followed in technical procedures.In this regard, considering the thickness of the glass, the dimensions and the diameter of the hole, the edges, the corners of the glass plate and the positions of the holes and relative to each other are determined.