Discussion
While machining cast iron coolant should be
Answer: A
Cast iron is machined with dry air.
Cast iron is normally machined dry. The free graphite flakes in it act as a built-in lubricant, and the chips come off as small, broken fragments and dust rather than long ribbons. A jet of compressed air is used to clear the chips and cool the cutting zone.
Water-based coolants and oils mix with cast iron dust to form an abrasive sludge that clogs the machine and slideways. Kerosene is used on aluminium, and machine (cutting) oil on steels, especially for threading and heavy cuts.
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