Many customers donot know which Kind spindle to choose when order a cnc router machine,here are the advantages and disadvantages of the two spindles:

1:Water-cooled spindles are typically used in applications involving long, high-load operations, such as stone carving, metal engraving, and multi-head relief engraving, primarily due to the length of processing time. Advantages of water-cooled spindles include low noise, high speed, and long lifespan.
Disadvantages include the need for antifreeze when temperatures drop below 0°C.

2:Air-cooled spindles are generally used in processing panels and panel furniture, such as cutting, drilling, and grooving.
Disadvantages include fan cooling and relatively high noise levels.
In conclusion,choose a water cooled or air cooled spindle cnc router machine is up to what is kind job you need process.if you have a furniture factory,process doors,cabinet,then choose air cooled spindle.
if you need working on aluminum,stone ect,then choose a water cooled spindle.
Do you have other questions when choose a cnc router machine?welcome to contact with me for more communication.