SKF
Oil and Air Lubrication Units
SKF oil and air lubrication units are precision assemblies that meter a microscopic amount of oil into a compressed air stream for delivery to high-speed bearings, particularly in machine tool spindles. The unit includes an oil reservoir, a precision metering pump (often piston-type with adjustable stroke), and multiple mixing valves where oil is combined with air. Each mixing valve serves one lubrication point and provides visual and electronic confirmation of operation. The units are designed for ultra-clean environments and are often integrated into the machine’s spindle control system. They provide the exact minimal oil volume required to maintain the bearing film at speeds exceeding 2 million n·dm. SKF oil+air units are the standard in high-speed machining, enabling reliable spindle operation at peak RPM with minimal maintenance.
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Trusted by Industry Leaders
Precision Piston‑Operated Metering
Doses as low as 1‑3 mm³ per bearing per cycle.
Mixing Valve Technology
Combines the oil droplet with a continuous air stream.
Visual and Electronic Cycle Confirmation
Clear tube shows oil movement; proximity switch detects cycle.
Modular Construction
Expandable from one to many bearing points.
Reservoir Level Switch
Automatic low‑oil alarm.
Filtration to 5 µm
Ensures no debris enters the precision metering valve.
Why Oil+Air Is the Only Way to Lubricate a 40,000 RPM Spindle
At 40,000 RPM, a grease‑packed bearing would instantly overheat and seize. The oil+air system provides a continuous, micro‑dosed film of fresh, cool oil, precisely metered to each bearing. The air stream carries away heat, keeping the bearing temperature below 60°C. This enables the extreme speed needed for high‑speed milling of aluminium and composites.
Verifying Oil+Air Delivery Without Disassembly
The clear plastic tube between the metering valve and the bearing allows the operator to see the small oil droplet travelling toward the bearing. A proximity sensor on the metering valve piston confirms each stroke. This gives 100% delivery assurance without opening the spindle — essential for unmanned machining operations.