Dolphin Centrifuge

Cutting Oil Centrifuge | Continuous Metal Fines Removal


Cutting Oil

What is Cutting Oil?

Machining metal generates heat, which damages 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, 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 even more expensive 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 and 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.


Centrifuge Model >>Alfa Laval MOPX 205Alfa Laval MOPX 210
ApplicationCopper Broaching OilAluminum Machining Oil
Viscosity40 cSt @ 50 C14 cSt @ 50 C
Separation Efficiency0.5-Micron Metal Particles0.5-Micron Metal Particles
Max. Capacity12 GPM25 GPM
Sludge Space0.6 Gallons1.5 Gallons
Oil Cleanliness0.01% Solids in Clean Oil @ 5 GPM0.01% Solids in Clean Oil @ 10 GPM
Oil Cleanliness0.025% Solids in Clean Oil @ 10 GPM0.025% Solids in Clean Oil @ 20 GPM
Motor Drive4 HP10 HP
System FeaturesVFD Feed Pump
5 Micron Polishing Filter
Sludge Tank & Pump
Clean Oil Tank w/ VFD Pump
Sludge Tank & Pump
60 kW Electric Pre-Heater

Material of Construction

The Alfa Laval MOPX 205 Cutting Oil centrifuge is designed for mineral oil and fuel separation applications. Therefore, the material used in its construction is well suited for such uses. The following table lists the various components of the centrifuge and the material it is made of.

Bowl Body & Bowl Hood316L Duplex Stainless Steel
Disc Stack316L Duplex Stainless Steel
Distributor or Disc CarrierMarine Grade Bronze or 316 Stainless Steel (Special Order)
Top DiscMarine Grade Bronze or 316 Stainless Steel (Special Order)
Top Covers (Collecting)Silium (Aluminum Alloy)
FrameNodular Cast Iron

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 filters' media and labor costs, 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 clean the drawing oil to a reusable level effectively.

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 and 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 their resue.

Again, filters are used 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 considering, especially in 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 and oil from the rolled metal.

Separating water-based emulsions from 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 ideal for recovering 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 at (248) 522-2573

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