What are you guys using in the winter to prevent freezing of the coolant? My unheated barn stays about 10 degrees warmer than outside, but for the most part it is still below 32 degrees in there most of the winter.
I ended up getting some of the Sierra brand pet safe antifreeze. So far except for a greenish hue to the coolant it seems to act the same as just the coolant/water mix. I'll have to wait till it's below zero to see how it reacts or if the oils separate or not.
I do ok with synthetic oil in it until about 28*f. Last winter I used a metal pail and the smallest aquarium heater they had at wally world. If I was going to be in the shop for a few days work I would leave the cheapo heater on. If not I would pull it fearing the ice would crush it.
sometimes my problem was slush in the impeller. Generally once you get to machining the heat pulled from the operation warms the coolant right up.
I do have an aquarium heater that I could use, but I figured if I just heated the coolant a little that it could still freeze on the machine if it was cold enough. When it's much colder than 15* (in the barn) you have to run the machines a while to let them warm up otherwise you lose quite a bit of power/speed. Your breath will also condense on the machine as frost. I really need to wall off my shop and heat it even if only to 45 degrees or so. Thanks VZ58 for all your help with my drill/mill over the years.
Just an update on the flood coolant. The Sierra pet safe antifreeze works great, and as a side benefit it keeps the coolant from getting funky from stuff growing in it. I had to add more antifreeze when it was below zero this winter but I'm still running the same coolant (add water from time to time due to evaporation) for almost 2 years now. Still not stinky, although it has a layer of oil in the sump and it looks darker than when it was new. I'll probably change it out this summer.