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Cold Gun Aircoolant

Replace messy mist systems - improve dry machining with clean, cold air!

What is The Cold Gun Aircoolant System?

A new solution to an old problem. Heat build up on dry machining operations reduces tool life and machining rates. The Cold Gun Aircoolant System produces a stream of clean, cold air at 50ºF (28ºC) below supply air temperature. Operation is quiet and there are NO MOVING PARTS to wear out. It will remove heat to prolong tool life and encrease productivity on machining operations when liquid coolant cannot be used.

The Cold Gun is also an alternative to expensive mist systems. It eliminates the costs associated with the purchase and disposal of cutting fluids and worker related health problems from breathing airborne coolants or slipping on wet floors.

EXAIR's Cold Gun is non-adjustable to prevent freeze-up during use. Cold airflow and temperature drop are factory set to optimize the gun's cooling capacity.

How The Cold Gun Works?

The Standard Cold Gun and High Power Cold Gun incorporate a Vortex Tube to convert an ordinary supply of compressed air (1) into two low pressure streams, one hot and one cold. Secondary air is drawn in (2). The Cold Gun's hot airstream is muffled and discharged through the hot air exhaust (3). The cold air (4) is muffled and discharged through the flexible hose (5), which directs it to the point of use. Easy mounting and portability are provided through the use of an attached magnetic base (6).


  • Tool sharpening
  • Drill and cutter grinding
  • Routing
  • Plunge and form grinding
  • Milling
  • Surface grinding
  • Drilling
  • Tire grinding
  • Band sawing
  • Plastic machining4Laser cutting
  • Chil rolls
  • Setting hot melt adhesives


  • Improves production rates
  • Prevents burning
  • Extend tool life - reduce breakage
  • Improves tolerance control
  • Prevents smearing of metal or plastics
  • Finished part is dry
  • Eliminates wheel loading
  • Low cost
  • Compact, lightweight, portable
  • No Moving Parts - Maintenance Free
  • Quiet
  • No coolant cost
  • Safe - No electricity


Tooling costs a lot of money to replace. That’s only part of the problem. As the tools wear out, you can expect:

  • Slowed production and downtime to change out the tooling
  • Poor tolerances and decreased dimensional accuracy due to increased temperature
  • Increased cutting force is required (generates more heat and uses more electricity)

If you could just make the tooling last longer, you’d not only cut the tool cost but could increase profits by reducing scrapped parts and downtime.

A long term study on the effect of refrigerated air on tool wear in wood machining was conducted at the Forestry Products Department of Purdue University by Ms. Judith Gisip. The project was under the direction of Dr. Rado Gazo (department professor) and Harold Stewart (professor at North Carolina State University with 35 years in wood machining research). Wood is brutal on tooling. In metalworking, most of the heat goes away with the machined chip. Wood is an excellent insulator and doesn’t conduct the heat away, which keeps it all there at the tool. Temperatures can exceed 1472°F (800°C)!

The extensive tests at Purdue were conducted in a 70°F climate controlled room. They tested (4) 1/2" (12.7mm) two-flute cutters on a CNC router at 16,000 rpm. (22) sheets of 3/4" thick MDF (medium density fiberboard) were fed one at a time, cutting away 1/4" (6mm) depth of cut on each pass. Power consumption of the CNC was recorded (current draw increases as the tool starts to dull). When finished, the surface of the tools was examined using a scanning electron microscope. Machining with the Cold Gun’s 20°F air reduced tool wear by over 21% compared to the results with no cooling.


EXAIR's Cold Gun is mounted under the protective guard.

Purdue's CNC router turns (22) 4'x8' sheets into sawdust.


Cold air from EXAIR's Model 5315 Cold Gun System keeps the tooling cool.

Here are some sample of applications:

The Model 5215 Cold Gun keeps the part cool to the touch and prevents discoloration.


Cold air from Cold Gun Aircoolant System eliminates heat cracking of the carbide tool during sharpening.


The Model 5315 Cold Gun cools a two flute 3/8" carbide cutter on a CNC, increasing tool life by 50%.


A Cold Gun can cool a grinding process, cold air eliminates heat cracking of carbide and tool edge burning during grinding and sharpening operations. Increased tool life between regrinds is the result.


Fly cutters up to 460mm in diameter have been coold with the Cold Gun Model 5215. Dissipating heat with cold air extends tool life, increases speeds and feeds and improves finishes.


Model 5315 Cold Gun System cooling a roll with 20ºF (-7ºC) air keeps the material on the surface from bunching up, jamming or tearing. The metal surface transfers the cold temperature to the product.


Cold air from a Model 5230 High Power Cold Gun System cools a laser cut part so it can be handled seconds later. The High Power Cold Gun has twice the cooling capacity of the standard Cold Gun, cooling the part in less time.


Controlling the Cold Air

The EXAIR Cold Gun gives instant cold air when filtered compressed air is supplied to it. Cycling on and off is a good way to save air. For on and off control, use a Model 9012 Manual Shutoff Valve. To turn the Cold Gun on with the machine, the Model 9020 Solenoid Valve may be used and wired through the machine control switch. This method is ideal for hand grinders and drill sharpeners.

The Compressed Air Supply

The Cold Gun is designed to use full line pressure of 80-100 PSIG (5.5-6.9 BAR). Temperature drop and flow are reduced when lower input pressures are applied. The use of clean, filtered air is essential to the operation of the Cold Gun. A filter separator that removes moisture, dirt and other particulates from the compressed air is included with each Cold Gun System. An optional Oil Removal Filter is also available.

Need More Cooling?

EXAIR’s High Power Cold Gun Aircoolant SystemTM produces twice the airflow of the standard Cold Gun, doubling the cooling capability. It produces cold air at 50oF (28oC) below the supply air temperature so the air is as cold as possible without freezing up. Two systems are available: the Model 5230 High Power Cold Gun with Single Point Hose Kit and Model 5330 High Power Cold Gun with Dual Point Hose Kit.

Cold Gun Dimensions

Selecting The Right Model

Cold Gun Aircoolant Systems are available with either a Single Point or Dual Point Hose Kit.

The Single Point Hose Kit (included with the Model 5215 Cold Gun and Model 5230 High Power Cold Gun) is recommended for applications where a concentrated airflow is needed such as drilling and grinding operations.

The Dual Point Hose Kit (included with the Model 5315 Cold Gun and Model 5330 High Power Cold Gun) is recommended for applications where the heat is generated over a larger surface area such as band sawing, milling, chill rolls and hot melt adhesives.

A Cold Gun System with the Model 5901 Single Point Hose Kit can be easily converted to a “dual point” system with the purchase of the Model 5902 Dual Point Hose Kit.

Cold Gun Aircoolant Systems

Model 5215 Cold Gun System (one cold outlet) includes Cold Gun, Single Point Hose Kit, 3/8" (10mm) Cone Nozzle, 1-1/4" (32mm) Fan Nozzle, Manual Drain Filter Separator.

Model 5315 Cold Gun System (two cold outlets) includes Cold Gun, Dual Point Hose Kit, (2) 1/4" (6mm) Cone Nozzles, (2) 1" (25mm) Fan Nozzles, Manual Drain Filter Separator.

Model 5230 High Power Cold Gun System (one cold outlet) includes High Power Cold Gun, Single Point Hose Kit, 3/8" (10mm) Cone Nozzle, 1-1/4" (32mm) Fan Nozzle, Automatic Drain Filter Separator.

Model 5330 High Power Cold Gun System (two cold outlets) includes High Power Cold Gun, Dual Point Hose Kit, (2) 1/4" (6mm) Cone Nozzles, (2) 1" (25mm) Fan Nozzles, Automatic Drain Filter Separator.

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