Industry · Machinery
From coolant to hydraulic systems, from chip separation to through-spindle cooling lines: filtration engineering that determines the efficiency, tool life and dimensional accuracy of CNC machines and central cooling systems.
3–4×
Longer coolant life
5–10 µm
Abrasive particles in hydraulics
ISO 4406
Particle count for oil cleanliness
Critical points
In machining, sustainability and high quality standards come not only from machine power but from the cleanliness of the coolant and hydraulic systems that feed those machines. Micro metal particles in coolant, invisible contamination in hydraulic oil and chips returning to the cutting zone trigger chains of problems ranging from tolerance errors to tool breakage.
Coolants are the fluids most prone to bacterial growth on production lines. The source of the bad odor is anaerobic bacteria that grow in stagnant fluid. Continuous circulation and filtration eliminate the environment these bacteria need; together with tramp oil removal, coolant life is extended three- to fourfold, lowering waste and replacement costs. Filtering micro metal particles out of the fluid prevents insert wear and keeps surface roughness (Ra) within standards. In through-spindle cooling systems this precision is even more critical: micron-level particles in the fluid passing through the tool’s fine channels block them instantly and cause both tool breakage and spindle damage.
Solution: Continuous circulation and tramp oil separation
The hydraulic systems in modern CNC machines and presses are extremely sensitive to micron-level contamination. Clear-looking hydraulic oil is not necessarily clean; invisible particles below 5–10 microns act like an abrasive paste in the system. The real cleanliness of the oil can only be determined with ISO 4406 particle count tests. Filtration that meets NAS or ISO cleanliness classes minimizes friction in precision bearings and hydraulic components and prevents valve seizure and seal wear. Clean hydraulic oil also prevents pressure fluctuations in the system and preserves the machine’s repeatability.
Solution: Filtration to ISO and NAS classes
Quickly removing the metal chips formed during machining from the fluid is the basis of dimensional conformity and surface quality. Chips returning to the cutting zone cause scratches and tolerance errors on machined parts. High-capacity magnetic or centrifugal separators provide continuous cleaning without human intervention and eliminate this risk at the source.
Solution: Magnetic or centrifugal separator
CNC line
Select a stage on your line to see the Prosestim filters and micron range used at that point.
01 · Coarse separation
Quickly removing chips from the fluid prevents scratches and tolerance errors.
02 · Coolant
Continuous circulation and filtration eliminate the environment anaerobic bacteria need; fluid life is extended three- to fourfold.
03 · Tramp oil
Removing tramp oil extends coolant life.
04 · Micron level
In through-spindle systems, particles in the fluid passing through fine channels block them instantly.
05 · ISO 4406
Particles below 5–10 microns act like an abrasive paste in the system; filtration to an ISO cleanliness class is required.
Applications
The same filtration principles apply across applications, with different material and micron choices.
Coolant and chip management.
Fluid life and bacteria control.
Valve and seal protection.
Fine particles and surface roughness.
Products used in this industry
Each product page lists the micron range, material compatibility and operating conditions.
Monofilament polyester bag filters, 20–1000 µm, rated up to 177 °C, washable and reusable
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PCP bag filters with a PP outer layer and cotton core; filtration down to 0.5 µm for chemically demanding, oily liquids
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String-wound cartridge filters in 8 media including PP, cotton and glass fiber, 0.8–150 µm, 5″–40″ lengths
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AISI 304/316 mesh, 5–1000 µm washable stainless steel cartridge filter for hot, viscous and aggressive lines
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Self-cleaning filter housing, 10–3,000 µm, that cleans itself without stopping the line; no cartridge changes, no downtime
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Bag filter housing with 1–24 bag capacity and AISI 304/316/316Ti body; high flow, low pressure drop
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