Higher operating temperature: They tend to operate at a higher temperature than water-cooled spindles, which may affect the accuracy of the machining process.

Water-cooled spindle:

A water-cooled spindle uses water to cool the motor and spindle. The water circulates through the motor and spindle, dissipating the heat generated during operation. Water-cooled spindles are generally more expensive than air-cooled spindles, but they offer higher cooling capacity and are suitable for heavy-duty applications that require prolonged use or high-speed cutting.

Advantages of water-cooled spindles:

High cooling capacity: Water-cooled spindles have a higher cooling capacity than air-cooled spindles, making them suitable for heavy-duty applications that require prolonged use or high-speed cutting.

Lower operating temperature: They tend to operate at a lower temperature than air-cooled spindles, which helps maintain the accuracy of the machining process.

Quieter operation: Water-cooled spindles tend to operate quieter than air-cooled spindles as they do not have a built-in fan.

In conclusion, the choice between air-cooled and water-cooled spindles ultimately depends on the specific application requirements. If you require a spindle for light-duty applications or have a limited budget, an air-cooled spindle may be the right choice. On the other hand, if you require a spindle for heavy-duty applications that require prolonged use or high-speed cutting, a water-cooled spindle may be the better choice despite the higher cost and maintenance requirements.