norman said:

I'm wondering what type or kind of cutting fluid that your using? Is it oil or syn. based?

 

I don't know what the base oil is, probably a mineral oil. I use Castrol Cooledge B1 at around 5% by volume with water. It contains anti corrosion additives, along with anti fungal stuff etc. There's a chance of 'crevice corrosion' occurring where conditions allow it (close proximity parts) if it's left on there for days, but rather than red rust you get more of a staining of blackish/blue colour occurring. On a regularly used machine it's fine to leave well alone though. In reality I find a simple brush down to guide most of it into the chip tray, followed by a squeegee, sends most of it back to the reservoir, the rest quickly evaporates so the emulsion turns back into the oil, which is fine for corrosion in itself. My coolant system is a simple small submersible pond pump immersed in a tank. These pumps are cheap, run constantly, and don't mind running when the hose taps are turned off. If the machines are due to be laid up for more than a couple of days though I do a full clean down and oil down.