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GATE 2018 ME (ME2) – Question 27

Machining and Machine Tool Operations · Work holding, jigs and fixtures · 1 mark · Multiple choice

Which is preferred for holding an odd-shaped workpiece in a centre lathe?

  1. live and dead centres
  2. three-jaw chuck
  3. lathe dog
  4. four-jaw chuck

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Show answer and explanation

Correct answer: (D) four-jaw chuck

Explanation

An independent four-jaw chuck permits each jaw to be adjusted separately, accommodating irregular shapes and eccentric setups. Thus **four-jaw chuck, D**. A self-centering three-jaw chuck is more suited to regular round or hexagonal stock.