Vfd spindle motor has another name of high speed electric spindle. From the cooling mode, there are water cooling router spindle and air cooling router spindle; from the way of tool changing, there are manual tool changing cnc spindle and automated tool changing cnc spindle. Customer needs a spindle attachment normally because the two reasons: 1) diy a cnc router 2) maintenance for a cnc router Advantage and disadvantage of water cooling and air cooling vfd spindle Water cooling cnc router spindle motor Advantage: 1.Quiet 2.Can keep working for several hours without stop 3.Can be used in countries with hot weather Disadvantage: 1.During the machine working, we should pay attention to the water status. The water should be changed when it is over 60 degree centigrade or it become dirty. Available power: 1.5kw, 2.2kw, 3.0kw, 4.5kw, 5.5kw, 6.0kw Available brand: all chinese brand