Coolant Misting System
Last updated on Saturday, October 19, 2019 11:52:08 AM Mountain US Time Zone


Nozzle, Air Supply, Valves, Reservoirs

This is a Kool Mist spray coolant system (manual). I use it mainly for air cooling & chip removal.
A momentary, solenoid-activated liquid control valve will allow very short deliveries of liquid lubricant.
The solenoid can also be controlled via g-code using Mach3 & its relay box in a CNC application.


Lightly misting an aluminum surface with a water-soluable coolant while fly-cutting.
Rusting due to the coolant's water content poses no problems.

The nozzle moves with the cutter. The mill's paint was too thick & the magnet too weak to allow a strong attachment. 
The liquid/air mix valve is attached to a 1/2" steel plate that has two 10-32 cap-head screws threaded into the mill.

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.
A thin air line is inside the main, bendable tube.

Coolant & air mixed at the nozzle's tip.































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Air Supply

Shop air supply compressor (manual).

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Also see the Hand Tools Section.


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 5/8" to trap the connector nut.
Note the 6-32 set screws
(above) were changed to 10-32 (below) for a better grip.

Installed 1/4" 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 coolant pick-up tube end has the Kool Mist particulate filter/anti-siphon valve.
The metal lid has a 1/16" hole to let in air. The coolant is Kool Mist 77 diluted 1:20 distilled H

Kool Mist SS coolant reservoir with mixing & air supply valves.

Nozzle, Air Supply, Valves, Reservoirs