Dolphin Centrifuge

Cutting Oil Centrifuge | Continuous Metal Fines Removal


Cutting Oil

What is Cutting Oil?

Machining of metal generates heat, which is detrimental to the cutting tool and the machined part. Cutting oil, also known as cutting fluid, dissipates the heat generated during machining.

The oil also reduces the friction between the cutting tool and the machined surface, thereby extending tool life.

Cutting oil is widely used in turning, milling, saw-cutting, gear hobbing, and other machining processes.

Need to Recycle Cutting Oil

Oils are expensive to buy and sometimes are even more costly to dispose of. Environmental regulations are becoming demanding, with laws banning the “wear-out and throw-away” approach.

In other words, companies today must keep their oils in service for as long as possible. With an industrial centrifuge, they can – sometimes indefinitely!

Fine metal particles contaminate cutting oil during the machining process. These particles can cause an imperfect surface finish of machined parts as well as reduced tool life. It is essential to remove these particles to reuse the oil.

Cutting Oil Centrifuge

An industrial centrifuge specially modified to recover used cutting oil is known as a cutting oil centrifuge. It separates metal sediment contaminants and water (if any) from industrial cutting oil.


A cutting oil centrifuge removes fine metal particles from the oil used to machine ferrous and non-ferrous components. The high centrifugal force (7,000 Gs) exerted by a disc-stack centrifuge separates small metal particles (0.5 microns) from the cutting oil.

The centrifuge self-ejects the separated particles periodically.

Clean cutting fluid recovered by the centrifuge is reusable, thus saving replacement oil and disposal costs.

Cutting Oil Self-Cleaning Centrifuge
Cutting Oil Self-Cleaning Centrifuge


Centrifuges offer several benefits for industrial fluids. Some of them are listed below.


TypeAlfa Laval MOPX 210
ApplicationAluminum Machining Oil
Viscosity14 cSt @ 50 C
Max. Capacity25 GPM
Sludge Space1.5 Gallons
Oil Cleanliness @ 10 GPM0.01% Solids in Clean Oil
Oil Cleanliness @ 25 GPM0.025% Solids in Clean Oil
Motor Drive10 HP
System FeaturesClean Oil Tank w/ VFD Pump
Sludge Tank & Pump
60 kW Electric Pre-Heater

Draw Oil Centrifuge

Draw oil reduces the friction between metal forming dies and the formed metal. It is a high viscosity oil that sticks to the drawn metal and drawing die surface, providing essential lubrication during the stretching process. Sheet metal parts, metal extrusion, wire drawing, etc. all use drawing lubricants.

The severe friction between the die and drawn metal causes wear on the forming raw metal surface. These wear particles contaminate the drawing oil reducing its useful lifespan.

Traditionally filtration is the way to remove these fine particles from drawing oil. However, considering the media and labor costs associated with filters, the industrial centrifuge is often the most cost-effective option.


A draw oil centrifuge is a high-speed disc centrifuge that separates small wear metal particles from the drawing oil. An industrial centrifuge generating over 7,000 g-force removes all fine metal particles down to 1/2 micron level consistently from draw oil.

The higher viscosity of drawing oil reduces the throughput capacity of the centrifuge. Increasing the drawing oil temperature through a heater reduces the viscosity, increasing the centrifuge efficiency and throughput.

Alfa Laval Draw Oil Centrifuge
Alfa Laval Aluminum Draw Oil Centrifuge

Aluminum wire drawing is a typical application where large amounts of very fine aluminum powder contaminate the drawing oil. An Alfa Laval self-cleaning centrifuge produces high enough centrifugal force to effectively clean the draw oil to a reusable level.

Multiple aluminum wire drawing companies are using Dolphin Centrifuge manufactured draw oil centrifuge systems. Contact us for capacity and performance details.

Rolling Oil

Forming plates and sheets of metal by squeezing large billets between two rollers is known as rolling. Rolling is a standard process in manufacturing sheets from steel, aluminum, copper, and other metals.

Rolling oil is a lubricant used to reduce the friction between the rollers and the rolled metal. The lubrication facilitates smooth processing as well as the desired surface finish of the sheets produced.

The hot rolling process causes scaling on the surface of the feedstock that contaminates the rolling oil. It is imperative to separate these solid particles from the oil for its resue.

Again, it is standard practice to use filters to remove these slag or scale particles from rolling oil. The cost of filtration media and related labor adds up over time. Mechanical separation with an industrial centrifuge is worth consideration, especially in cases of high rolling oil volumes.

Cold rolling of steel and copper alloys uses oil emulsion. This emulsion is a specific blend of water-soluble rolling oil with water. Rolling oil emulsions get contaminated with fine metal debris as well as oil from the rolled metal.

Separation of water-based emulsions from the undesirable oil and particles is the perfect application for our machine coolant centrifuges.

Rolling Oil Centrifuge

Alfa Laval MOPX207 System for Industrial Oils
Alfa Laval MOPX 207 for Industrial Oils

A high-speed, disc-stack centrifuge is an ideal solution to recover rolling oil by separating metal particles from the oil.

Given the higher proportion of solids, a ‘self-cleaning’ type centrifuge can remove all solids down to a half-micron level from the rolling oil.

They are thus extending the useful life of the oil multiple times, saving replacement and disposal costs.


To get more details email us or call us on (248) 522-2573

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