Difficulty: Easy
Correct Answer: Incorrect
Explanation:
Introduction / Context:
Twist drills are designed with helical flutes whose primary roles are to form the cutting lips and convey chips out of the hole. Whether chips move out “automatically” depends on flute geometry, feed, speed, material, and coolant or pecking strategy.
Given Data / Assumptions:
Concept / Approach:
Under correct parameters, helical flutes actively transport chips toward the exit, reducing clogging and heat. Materials like mild steel and aluminum typically produce continuous chips that the flute lifts. However, poor parameters, too deep holes without pecking, or gummy materials can hinder evacuation. The base design intent is automatic chip conveyance, so the blanket statement that chips do not move out automatically is false.
Step-by-Step Reasoning:
Verification / Alternative check:
Practical observation shows chips exiting along flutes during routine drilling; deep-hole or sticky materials need peck cycles but the flute still provides automatic conveyance path.
Why Other Options Are Wrong:
Choosing “Correct” would ignore the fundamental purpose of flutes and common drilling experience.
Common Pitfalls:
Assuming automatic evacuation will always occur regardless of depth; deep holes demand peck drilling and cutting fluid to avoid packing.
Final Answer:
Incorrect
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