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Coolant Mist System

This is a Kool Mist spray coolant system. I use it mainly for air cooling & chip removal.
A momentary, solenoid-activated liquid control valve will allow very short deliveries of liquid lubricant, as needed.

Misting surface while fly-cutting.

The spray head is located so as to move with the cutter. The paint was too thick & the magnet too weak to allow a good attachment. 
The liquid/air mix valve is attached to a ½" steel plate that has two, 10-32, cap-head screws threaded into the mill's head.


Coolant/air mixture valve mounted on steel base with aluminum spacer block.
A 10-32 cap-head bolt fastens the unit from the plate's back.

Brass spray nozzle is adjustable. Coolant & air mixed at the tip.

Shop air supply compressor.

Sub-plate mounted onto the left-rear of the mill stand with three sheet metal screws.
The plate has 10-32 bolt taps for the L-bracket.

L-bracket milled to hold the air valves. The channel is ⅝" to trap the connector nut.
Note the 6-32 set screws (above) were changed to 10-32 (below) for a better grip.

Installed ¼" NPT (6.4 mm) mini-ball valves to control both the air & coolant supplies.
 The air valve & the spring-loaded quick connect/disconnect mount through the bracket.
The gap between these particular connectors is about 0.08".
The system works well with higher (70-90 psi) pressures.
The two valves allow good control over both air & coolant.

Coolant tank made from a 1 gal. gas can which is low cost & chemical resistant.
The metal lid has a 1/16" hole to let in air. The coolant is Kool Mist 77 diluted 1:20 distilled H₂O.
The coolant pick-up tube end has the Kool Mist particulate filter/anti-siphon valve.