The spindle motor is an important component of many modern machine tools and industrial robots. Since the motor drives the spindle directly with this spindle drive and there is no gear or V-belt for transmission, the motor spindle is also referred to as a direct drive. A spindle motor consists of various components. The basic structure is the same from manufacturer to manufacturer. The main components of the motor spindle are: housing, spindle and motor. Further elements include: spindle bearings, tool interface, cooling and sensors for monitoring the function and supporting the control.

Machining spindles are often powered by electricity, but they can also be powered by compressed air. They’re available in a wide range of sizes to meet many needs. A spindle is devised of a motor, a taper for holding tools, and a shaft that holds together all the separate components. Spindles rotate on an axis, which receives input on movement from the accompanying CNC controller.

In machine shops, high-speed spindles are often preferred, as these configurations work best when dealing with metal and other materials. There are two types of high-speed spindles, each of which offers its own distinct set of benefits. An integral motor spindle features an internal motor, with a maximum speed range of 60,000 Rpms. Such a high maximum speed makes it great for a number of machining applications but can also limit its lifespan. Additionally, power and torque are limited due to the constricting design of motor housing Belt-driven spindles are another high-speed option. While max speed, which is 15,000 RPMs, is far less than integral motor spindles, this design can achieve greater levels of power and torque thanks to the external motor. This spindle type is also less costly, which makes it an ideal option for machine shops with limited budgets. However, the low max speed can restrict how the spindle is used

Spindles have a multitude of uses across many industries. This includes equipment integral to agriculture, automotive applications, mold manufacturing, and even aerospace applications. In terms of the machining process, spindles play an important role in a fast production space. For instance, metal lathes are used to cut hard materials. Along with metals, these machines can also cut plastics, as well as sturdy composite materials. Lathes can be used for milling, which uses rotary cutters to trim away at a piece until it reaches the desired shape. Machines containing spindles can also be used in woodworking, electrical component creation, and manufacturing parts for computers

The right choice of a spindle or a milling head is very important. As long as that goes for fun in plywood or soft plastics, a"toy" brush spindle in a plastic housing may be enough. But for the professional use (i.e. to make money) it is totally unsuitable. With hard work it can be finished in a few hours and at economical work it may be sufficient up to six months. Professional spindles are brushless inductive inverter-controlled spindles on ceramic bearings with a tight engine compartment and absolutely with a metal housing. We have a choice of spindle revolutions and power. The spindle speed is the nominal value of the identification plate (12.000, 15.000, 18.000, 24.000, 40.000 rpm), which does not mean that the spindle is always spinning with these revolutions. Revolutions can be controlled by the inverter, but you have to remember that the spindle power is the value of torque multiplied by rotational speed, so while preserving torque and reducing revolutions by half - about half the power also falls. And here we have to make a compromise ...