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Application · Grinding coolant filtration

Remove ferrous fines and abrasive grit.

Grinding releases fine metallic particulate from the workpiece and abrasive grit from the wheel. Ferrous grinding commonly combines magnetic separation with paper-bed filtration, while non-ferrous applications rely on media selected for the particulate and finish requirement.

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Mixed CNC operations may require additional tramp-oil, chip, and sump-cleaning equipment. Review CNC coolant filtration →
Grinding filtration process

Magnetic separation operates first so paper-bed media captures only the particulate the magnet cannot remove. Add C.R.O.S.S. when tramp oil, coolant degradation, consumption, and disposal also require control.

Grinding contaminant profile

Fine metal and abrasive grit require separate capture methods

Grinding swarf can remain suspended in coolant rather than settling for removal by a conveyor or sump magnet. Ferrous and mixed-material operations use magnetic and fabric filtration as required by the metal and abrasive loads.

Two contaminants require two separation methods
Grinding contaminants, capture equipment, and filtration performance
Contaminant loadCaptured byFiltration detail
Steel & cast iron finesMost grinding swarf is ferrous metal off the part, fine enough to stay suspended in the coolant.Magnetic separator98% removal · runs first, no media
Abrasive grit & non-ferrous finesGrit off the wheel, plus any aluminum or brass, passes straight through a magnet.Paper bed filter10 to 60 micron · by fabric grade
Operating effects of recirculated fines

Recirculated fines reach the work zone.

Fines left in the coolant cycle back through the cut and mar the surface finish. Removing them upstream is what protects the finish, the fluid, and the wheel.
Surface finish
Improves
Coolant life
Extended
Tool life
Extended
Grinding coolant filtration equipment

Match each filtration stage to the contaminant load

A magnetic separator captures ferrous fines, while a paper bed captures abrasive grit and non-ferrous particulate. The DCO Combination Filter integrates both stages for ferrous and mixed-material applications. Add C.R.O.S.S. when the application also requires tramp-oil removal, concentration control, and coolant recycling.

  • FERROUS-FINES SEPARATIONMD Magnetic Separator

    Magnetic separator

    Continuous ferrous-fines removal

    Rotating magnetic discs capture ferrous fines a quarter inch and smaller; a scraper clears them; clean fluid flows out by gravity. No filter media to replace.

    98%
    Ferrous removal
    13–396 gpm
    11 models
    View the system →
  • ABRASIVE GRIT AND REMAINING PARTICULATEG model gravity paper bed filter

    Paper bed filter

    Abrasive grit and non-ferrous fines

    Dirty fluid crosses a disposable fabric that advances itself; the fabric grade sets the rating, changeable per application. It catches what the magnet cannot hold.

    10–60 µm
    By fabric grade
    13–132 gpm
    Gravity bed
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  • INTEGRATED TWO-STAGE FILTRATIONDCO Combination Filter, magnetic separator and paper bed

    DCO Combination Filter

    Integrated magnetic and paper-bed filtration

    Magnetic separation and paper-bed filtration are integrated in one system. The magnet operates first so the fabric handles only the remaining particulate.

    2
    stages, magnet first
    98%
    Ferrous removal
    View the system →
  • BROADER COOLANT MANAGEMENT

    C.R.O.S.S.

    Tramp-oil removal and coolant recovery

    Particle filtration does not remove tramp oil or control coolant concentration. C.R.O.S.S. adds contaminant separation, concentration control, and coolant recovery when fluid quality is the broader operating concern.

    99.75%
    Tramp oil & particulate removed, by volume
    2–25 gpm
    Machine-shop coolant recycling
    View the system →
Identify the contaminant mix

The proportion of ferrous fines, abrasive grit, and non-ferrous metal determines the required filtration stages. An engineer can review the process and recommend the appropriate configuration.

Magnetic and paper-bed filtration can be integrated in one unit. See the DCO combination filter →
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Grinding process requirements

Configure filtration for the grinding process

Required flow, contaminant load, operating frequency, and surface-finish requirements vary by grinding process.

CenterlessContinuous through-feed

Continuous cutting produces a steady fines load while coolant circulates through the work zone. Evaluate magnetic separation followed by paper-bed filtration, sized to the machine's required flow. An engineer selects the fabric grade for the process requirements.

Surface & gearFerrous-dominant

Intermittent passes on surface work, hardened-steel fines on gear work. Both are ferrous-dominant loads, where the magnet is the lead stage and the fabric grade is selected against the finish specification.

Toolroom & small grindersSingle machine

The smallest gravity bed handles 13 GPM on a 49-gallon tank, and custom sizing is available below that. Low-duty installations are sized by an engineer.

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Carbide & lappingApplication review

Carbide swarf and polishing media require application-specific filtration. Provide the material, fluid, particulate profile, and required finish for equipment selection.

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Titanium & nickel alloyMaterial-specific review

Titanium and nickel-alloy grinding adds material-handling and regulatory considerations to the fine-particulate load.

Aerospace coolant filtration →
System sizing

Sizing beyond a single grinder

Size magnetic and paper-bed filtration to the grinder's required coolant flow and contaminant load. C.R.O.S.S. provides shop-wide coolant recycling where fluid quality and consumption require broader control.

View C.R.O.S.S. →Talk to an engineer
2–25 gpm
C.R.O.S.S. machine-shop coolant recycling for grinding operations.
Central / batch / hybrid
Coolant transfer is configured separately from filtration capacity.
Equipment selection

Common grinding filtration questions

  • 01

    Magnetic separator or paper bed for grinding swarf?

    Ferrous grinding commonly uses both, in that order. The magnet removes steel and cast-iron fines without disposable media, while the paper bed captures abrasive grit and remaining particulate. Non-ferrous work relies on paper-bed media or another application-specific filtration method. The DCO Combination Filter integrates magnetic and paper-bed stages.

    See the DCO combination filter →
  • 02

    What micron rating does the process require?

    Paper-bed fabric is available in grades from 10 to 60 microns and can be changed by application. The required rating depends on the coolant, grinding wheel, and surface-finish specification. An engineer selects the fabric grade for the application.

    Talk to an engineer →
  • 03

    Can magnetic and paper-bed filtration be integrated?

    Yes. The DCO Combination Filter integrates a magnetic separator and paper bed in one system. Magnetic separation operates first so the fabric captures only the remaining particulate. Both stages can be included in one quotation request.

    See the DCO combination filter →
  • 04

    How can frequent grinding-sludge cleanouts be reduced?

    Continuous filtration captures fines before they settle, while a sump cleaner removes accumulated sludge with less manual labor and downtime.

    Sump cleaning →
Equipment advice and pricing

Keep grinding fines away from the workpiece

Remove recirculating swarf and abrasive grit that can interfere with the finish you need to achieve.

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