Answer / krishna

oil

Answer / harish

Actually the question itself is incomplete for example if
we are machining cast iron then air is the best lubricant,
If we are machining mild steel water is the best lubricant,
If we are machining alloy steels then mineral oils are the
best lubricants so we cant specifically say a particular
lubricant is better all the lubricants are equally
important.

Answer / sushil

oil

Answer / s.khan

oil is the best lub.

Answer / rakesh

no air is the best lubricant because lubricant means to
reduce the friction .i give a example to explain my
answer .megnatic traing .there is no oil no water only air
in b/w the track or train less friction as compaire to oil
and water

1 air
2 oil
3 water

Answer / g.sailendra reddy

oil

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