What is the purpose and benefit of peck drilling?

• A. To evacuate chips to prevent overheating and tool breakage
• B. To drill faster
• C. To produce a smoother hole finish
• D. To reduce drilling noise

Answer: (A)

Peck drilling focuses on managing chip flow and heat by periodically retracting the drill to break and clear chips. The main idea is to keep chips from piling up and rubbing against the cutting edge, which would raise temperature, wear the tool, and risk breaking the drill. By withdrawing the drill at intervals, you create space for chips to escape, allow coolant to reach the cutting edge, and cool the tool more effectively. This approach is especially helpful for deep holes or materials that produce long, stringy chips. The big payoff is longer tool life, fewer chip-related problems, and more consistent hole quality. Other effects like finishing or speed can occur, but the primary purpose is evacuating chips and controlling heat to prevent overheating and tool breakage.