I am new to metalworking, and am struggling with my new lathe (9x20?)to
achieve decent surface finishes on steel parts. Currently I am working
with bright mild steel, but have just ordered some EN8, EN19 and SS304
to do comparative tests.
I do not have the ability to flood cool the job, I am considering
adapting to flood coolant system for use with soluble oil. Is this
worthwhile?

I am cutting with a Korloy insert tool, 50 m/min speed and 0.1 mm/rev
feed, which is conservative.

Any suggestions ??