So we have a small CNC shop, 1 mill and 1 lathe, and we haven't had to replace the coolant in the machine until now...
In the lathe in particular, all the lube oil from the ways drains into the coolant tray, so its gotten pretty nasty in there since there's no oil skimmer...
So we've drained the coolant into a large drum, have let it sit for a week and it looks like all the oil has separated to the top, and hopefully any solids have sunk to the bottom...
So I'm wondering what to do with this coolant now... if we skim off all the oil, is it good to go back in the machine? If not, what do you typically do with it / how do you dispose of it?
And how frequently should coolant be replaced?
Thanks...