There’s been talks and photos of different coolant systems on the Sienci Mill One Group over the last few months, but this is the first full guide I’ve seen on setting it up on a Mill One. Check it out here: https://www.instructables.com/id/Sienci-Mill-One-AirOil-Mist-Coolant-System/
So why a coolant system? Well, when it comes to cutting aluminum, one of the biggest challenges is to keep the end mill from clogging with aluminum chips that weld themselves due to the heat created by friction. Aluminum has a fairly low melting point, making it a material susceptible to this.
There are a few methods to make sure you don’t damage your end mills. One is to make sure that the chips you’re creating are large enough to carry the heat created away from the cut. This is where using a single flute aluminum bit works well, since the single, large flute creates larger chips than what a 2 flute or a 4 flute would typically do. This works great with most jobs, and typically you won’t reach those temperatures. However, with long jobs that can take several hours, some sort of cooling is nice to have.
Andrey’s method of using a mist coolant system is commonly used in industry on large, industrial machines. It uses a blast of air, mixed with a stream of vaporized coolant, pointed toward the end mill to lubricate and cool the part and the tool. Unlike flood cooling, which uses a stream of liquid coolant that sprays at the tool, mist cooling requires far less coolant, and if properly set up, a lot less messy.
If you’ve had this mod in mind for your Mill One, check it out!