I'm about to build a coolant system using a 5 gal bucket, a submersable pump and some baffles and screens to sort out the chips. 5 gal of oil cost too much. So I'm looking at using soluble oil (the kind you dilute with water).
I used some a while back and I recall it stained my mill table and caused my hands to itch. Maybe there is something better now.
Do any of you have a recomendation?