Drilling is the most difficult of mechanical machining processes due to the fact that the drilling takes place in a confined space and the poor heat conduction of the cast polyamide. The use of appropriate equipment and attention will prevent problems such as breakage, cracking and surface deterioration. The slow drilling operation will enable the chip to be ejected faster and more efficiently by using large grooved drill bits. For best results, use a new drill bit and grind the drill bit to reduce the resistance surface, providing a positive inclination angle of 0 to 5 degrees at the cutting edge. For small drill bits, an angle of 90-110 degrees is ideal. For larger drill bits, an angle of 118-120 degrees is recommended. Standard drills used for metals should never be used for casting polyamide drilling. Frequent use of coolants is essential for successful drilling. When the maximum half of the desired depth is reached during the drilling process, the drill bit must be completely removed and the sawdust accumulated in the channels must be ejected. For drilling, it is very important to first drill a small guide hole (maximum Ø8mm) and then expand the hole to the desired size. Otherwise, the product is likely to experience cracking and breakage due to chip jamming and surface tension in a narrow space. It is recommended to comply with the requirements of the turning process during finalizing the bore.