How does an air-cooled spindle work?

spindle, which helps to dissipate heat generated during operation. The cooling effect of the air helps to prevent the spindle from overheating and prolongs its lifespan.


Air-cooled spindles are the key components of many electric machines and tools. It provides a rotating shaft that can be rotated at high speed for many applications, allowing various machining devices to cut, drill, and mill. Unlike liquid-cooled spindles that require circulating coolant, air-cooled spindles rely solely on airflow and heat dissipation to prevent overheating.


The structure of air-cooled spindle


The core of the air-cooled main shaft is the precision bearing assembly. This assembly usually contains conical roller bearings or angular contact ball bearings that allow high-speed rotation with minimal friction and runout. The bearings are mounted on the hardened steel spindle. The bearings must be preloaded appropriately for continuous operation. The main shaft protrudes from the front of the bearing assembly and can be connected to a machine tool or workpiece.


Running of air-cooled spindles


One of the key requirements of air cooled spindles during operation is effective heat dissipation. When the main shaft rotates, especially at high speeds, the bearing assembly generates a lot of heat due to friction. If this heat is not dissipated efficiently, it can cause overheating of the main shaft, causing damage to bearings, seals, and lubricants. To prevent overheating, air-cooled spindles have fins, fans, and air vents that direct cooling air above and around bearings and spindles. The flowing air absorbs heat and carries it away from the spindle. Effective airflow is essential for proper operation.




In summary, air-cooled spindles mainly work by combining precision bearings, rigid spindles, and airflow ventilation. The bearings rotate at high speed while the air flow eliminates the resulting heat. If properly designed and implemented, air-cooled spindles can achieve spindle speeds of 20,000 to 30,000 rpm or more without overheating, thereby facilitating high-performance cutting, drilling, and milling operations.


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