With glass drilling, chip appearance at the entrance and even more so at the exit of the drill determines the quality of work. It is possible to reduce chipping to the satisfying level with the optimization of the machining parameters. Due to inability of arithmetic determination, choosing the optimal machining parameters is in this research and in general an experimental process based on tests. It is important to research existing literature about the discussed theme in order to get the satisfying experimental results as soon as possible. We chose the machining parameters at which the chipping meets the research requirements and found, that holding the workpiece plays a big role in chipping and fracking of the glass.