I made this over 2 years ago and it is still in use today.
I do not use any chemicals just plain water at about 20 psi with the water flow turned down so I can just see the mist.
The air pressure tends to keep the cut clear of chips too.
I have learned that for me smaller cuts and slower feeds work better and fewer broken bits.
Most of my work on this CNC mill is with 0.125 and smaller end mills.
I have done several jobs with a 0.0315 tool making branding irons for woodworkers.
Thanks for looking
Ray
Don't you get any rusting from only using water? I use flood coolant with Kool Mist that has rust inhibitors, and it does make a mess. I would like to change over to a mist type system but was always concerned about breathing in the mist. As you are using smaller bits on a CNC unit, I tend to use my very old manual mill in the horizontal mode where it makes a lot of (big) chips. What do you think?
Mike