Question

Why is the cutting fluid generally not used during drilling cast iron

Answer 1

fluid being hot can harm

liquid is not cutable

Answer 2

Hey mate...

here is your answer

The carbon percentage in cast iron lies between 2.1 to 6.67%,which is a large amount of carbon. Due to which graphite flakes are formed in cast iron. Since graphite contains several layer like structure. These layers can slide over each other. Which provides the lubricating nature in graphite.

So when we perform machining operation in cast iron then graphite flakes slides between tool and work material which helps in lubrication.

And since cast iron is brittle in nature so it produce discontinuous chips during machining which eliminates the need of coolant.

But these all are theoretical things, in actual machining operation to improve tool life and avoid tool wear lubrication is required.

hope it helps you!!!

please mark my answers as the brainliest answer.