Drilling practice: For twist-fluted drills, do chips evacuate automatically through the helical flutes under proper cutting conditions?

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:

  • Standard twist drill with appropriate helix angle for the work material.
  • Normal drilling conditions with adequate clearance and lubricant/coolant where needed.
  • Statement to assess: “In twist fluted drills, chips do not move out automatically.”


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:

Recognize flute function: chip conveyance via helix geometry.With proper speed/feed and coolant, chips spiral out unaided in most cases.Therefore, the claim “chips do not move out automatically” contradicts standard operation.Conclusion: mark the statement as incorrect.


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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