A simple turning operation is carried out on a lathe machine at constant spindle speed. What will happen after a few turning passes?

This question was previously asked in
ESE Mechanical 2014 Official Paper - 2
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  1. Cutting velocity will increase and surface finish improves
  2. Cutting velocity will decrease and surface finish deteriorates
  3. Cutting velocity will increase and chattering occurs
  4. Cutting velocity will decrease and chattering reduces

Answer (Detailed Solution Below)

Option 4 : Cutting velocity will decrease and chattering reduces
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Detailed Solution

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Velocity (V) = ΠDN

Where D is diameter of object

N is spindle speed in revolution per minute

By turning operation diameter of object decreases i.e. cutting velocity decreases.

Chattering is too and fro motion of cutting tool during their operation. Chattering force is directly proportion to the cutting velocity. Since cutting velocity decreases therefore chattering reduces.

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