Question

Which of the following is machined dry?
(a) Aluminium
(b) Cast iron
(c) Titanium
(d) All of these

Answer 1

The option ( a) Aluminium is the answer which is machined dry.

Answer 2

(b) Cast iron

Explanation:

• Machined drying is a process of using tools made up of certain elements which do not use coolant or cool liquid for machining.  
• Machined dried are used mainly to cut costs and also help in protecting the environment.
• Cast iron is machined dried because it doesn't need any lubricants from outside as it contains graphite in it which is itself a coolant.
• Aluminium and Titanium need coolant while machining and hence cannot be categorized in machined dry.

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