From our experience, most come in 65mm and 80mm diameters. Most spindles in this size range will have a 1.5-2.2kW rating, or 2HP to 3HP approximately, and come with a 65mm or 80mm body.

Unlike routers, you don't use spindles by hand or on a CNC machine. Because of this, they don't typically have a plunge base on them or a dust extractor. Instead, they normally consist of the spindle itself and the motor. Spindles generally have one of two types of motors: an electric or air-powered motor.

A good spindle should last at least 10 to 15 years under normal operating conditions. You can prevent most spindle failures by following a few simple maintenance procedures, like measuring the force of your spindle twice per year to prevent vibrations and running out due to a drop in force.

Remember, selecting the right CNC spindle involves considering speed requirements, material compatibility, and precision needs. High-speed spindles, for example, excel in tasks like intricate engravings or drilling small holes in aluminum or wood.