Which of the following is the most common type of cutting fluid used in almost all the machining operation?

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ALP CBT 2 Fitter Previous Paper: Held on 23 Jan 2019 Shift 1
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  1. Lard oil
  2. Synthetic Oil
  3. Olive oil
  4. Soluble oil

Answer (Detailed Solution Below)

Option 4 : Soluble oil
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Explanation:

  • Cutting fluids and compounds are the substances used for efficient cutting while cutting operation take place.
  • Types of cutting fluids:
    • Straight mineral oil
    • Chemical solution (synthetic fluids)
    • Compounded or blended oil
    • Fatty oils
    • Soluble oil (Emulsified oil-suds)

Soluble oil (Emulsified oil)

  • Water is the cheapest coolant, but it is not suitable because it causes rust to ferrous metals. 
  • An oil called soluble oil is added to water which gets a non-corrosive effect with water in the ratio of about 1 : 20.
  • It dissolves in water giving a white milky solution.
  • Soluble oil is an oil blend mixed with an emulsifier.
  • It is most common type of cutting fluid used in almost all the machining operation.
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