Multiple choice

In the turning operation, RPM of the spindle depends on

  1. Length of the job

  2. Diameter of the job

  3. Both of the above

  4. None of the above
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B Correct answer
Explanation

In lathe turning operations, the spindle RPM depends on the diameter of the job. The cutting speed (V) is calculated as V = π × D × N / 1000, where D is diameter and N is RPM. For a given cutting speed, as the diameter decreases, RPM must increase to maintain the same surface speed. The length of the job does not directly affect RPM selection.

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