Metalworking fluids
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Frequently asked questions
How do I choose between neat oil and water-miscible fluids?
Neat oils lubricate well, suiting tapping, broaching, threading and low speeds. Water-miscible fluids (emulsions, semi-synthetics, synthetics) cool better, suiting high-speed turning and milling. Check whether the machine allows water-based fluids, as some share circuits with lubricating oil.
What concentration should be used and how is it measured?
General turning and milling often run about 5 to 8 percent, heavy operations 8 to 12 percent, following the maker's guidance. Measure with a refractometer and multiply by that product's refractive factor. Always add concentrate to water, not water to concentrate.
Why does coolant start to smell after a few weeks?
Bacteria grow when concentration drops, tramp hydraulic oil leaks into the sump, or the fluid stands still for long periods. Keep concentration correct, skim tramp oil, circulate during downtime, and monitor pH, typically around 8.5 to 9.5.
Can metalworking fluid cause corrosion or skin irritation?
Too low a concentration reduces rust protection on parts and machine tables. Too high a concentration or off-range pH can irritate skin. Read the product safety data sheet (SDS), wear suitable gloves and avoid prolonged contact.
How does mixing water affect the fluid?
Hard water rich in calcium and magnesium makes emulsions less stable, forms soap scum and reduces rust protection. Water containing chlorides or sulfates promotes corrosion and bacteria. Use water of moderate low hardness or treated water, following the fluid maker's guidance.
How often should the whole sump be replaced?
There is no fixed interval; the fluid is replaced when pH, concentration, bacteria count or tramp oil go beyond control limits and cannot be recovered. When changing, drain fully, clean the sump and lines with a system cleaner, then mix fresh fluid. Fresh fluid poured into a dirty sump becomes contaminated again very quickly.
Can spent metalworking fluid be poured down the drain?
No, used fluid contains oil, metals and chemicals and is waste that must be collected and treated under environmental rules. Store it in closed, labeled containers and hand it to a licensed waste handler. Skimming tramp oil and filtering chips extend fluid life and reduce waste volume.
Can cutting fluid share a system with hydraulic oil?
It should not: hydraulic or lubricating oil leaking into a water-based sump becomes tramp oil, feeding bacteria and breaking the emulsion. In reverse, cutting fluid in hydraulic oil reduces its lubricity. Fix the leaks and use an oil skimmer.
