I have long known that a steady, low pressure stream of air directed at the work being milled would keep the chips cleared away from the cutter giving me a cleaner cut and letting me see what was going on. Up til now, I've just kept the air hose handy and periodically blasted away the chips when the buildup became intolerable.
While not as effective as liquid coolant, air is not as messy, and quite a bit easier to set up. I finally decided to cobble something together.
The arrangement I came up with required almost no machining and used materials I already had on hand...


The tip is a .030" mig welder tip. It has threads on the end that easily threaded into a piece of polyurethane tubing which in turn was slipped over the end of a length of 3/16" brass tubing.

And the whole thing attaches to my mill/drill column with a magnetic DTI stand.

The magnet is quite strong and the arm allows a wide range of adjustments. Since the assembly is attached to the mill column rather than the table, the air source stays on the tip of the milling cutter and doesn't move as the table is cranked on either axis.
Chuck