Tormach Garage Series, Part 6 - How to Choose Coolant

Before cutting your parts, you have to decide on how to remove chips from the surface to prevent the chips from being pulled back into the cutter and recut, which will cause poor surface finish. Tormach offers several options: Flood Coolant or MQL, which stands for minimum quantity lubrication.
Flood coolant is the traditional method of removing chips away from the cutting area with a literal flood of coolant. This is done through the use of powerful pumps that expel coolant out of a nozzle directed at the cutter. The coolant used is a mixture of purified water from an RO system or distilled water, and a coolant additive that helps lubricate the water, making the cutters job easier and will help prevent rust in your machine. Dealing with these large quantities of liquid based coolant will necessitate a water-tight enclosure and coolant holding tanks under the mill. Over time coolants can stagnate causing health issues, so it's important to remove the surface bacteria with a skimmer kit. Tormach offers one with the Tormach Skimmer Kit: tormach.com/oi...
To verify the quality of the coolant in your tanks, a refractometer can be used to check on the concentration of coolant, as water can be lost to evaporation.
Flood coolant is a powerful option to forcefully remove the chips, but that force can cause a mess. If you'd rather not deal with all that coolant, then an MQL system might be a great match. This system reduces the amount of coolant to the bare minimum, some even call it near-dry lubrication. The MQL nozzles spray a fine mist of coolant, combined with air to force the chips away from the cutter.
Tormach Garage Series, Part 6 - How to Choose Coolant
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