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35GENERAL DRILLING HANDBOOKThe Quick and Easy Way toSelect Correct Drilling CycleThe most recommended and productive drilling method is to use the canned drilling cycle without pecking, i.e. G81 code. Efficient chip evacuation during drilling can often be very problematic and the deeper the hole, the more problematic the chip evacuation process. The solution to chip evacuation is to use a peck drilling cycle. In the case of using the peck drilling cycle with a short retract, denoted by the G73 code, the drill does not fully exit the hole. Instead, the tool retracts a specified distance inside the hole. The purpose of G73 is to break stringy chips and pull them out of the holes. By keeping the drill inside the hole, the impact of drill vibration on hole quality is significantly reduced, especially for long drills.In the case of using the peck drilling cycle with a full retract, denoted by the G83 code, the drill retracts completely out of the drilled hole at regular intervals to evacuate chips. This method, compared to the previously described methods, is the least productive and may result in lower tool life and potentially worse hole quality. Therefore, the peck drilling cycle with a full retract is recommended only when it is not feasible to effectively remove the chips using the methods described above.