Final answer:
Peck drilling is a method used in deep hole drilling to periodically retract the drill bit, which breaks up chip formation, allows for better chip evacuation, and improves cooling and lubrication. This results in increased drilling efficiency, longer tool life, and better dimensional accuracy of the drilled hole.
Step-by-step explanation:
The purpose of peck drilling is to break up the chip formation during the drilling process, which helps to improve the efficiency of deep hole drilling operations. This method involves periodically retracting the drill bit from the hole being drilled. One of the benefits of peck drilling is that it facilitates better chip evacuation. By breaking the chips into smaller pieces, peck drilling prevents long, stringy chips from forming, which can be difficult to remove and might cause damage to the workpiece or the tool.
Another benefit includes improved cooling and lubrication as the pecking motion allows cutting fluid to reach the cutting edge more effectively. This ensures the drill bit remains cool and reduces the risk of overheating, which could potentially affect the temper of the drill bit and the workpiece material. Furthermore, by allowing the drill to cool down and the flutes to clear out chips, peck drilling also helps in maintaining the dimensional accuracy of the hole, reducing the likelihood of tool wear and extending tool life.