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HOW TO CHOOSE A CNC 3.5kw Spindle Motor?
 Oct 28, 2022|View:282

As precision tasks continue to become more important, the popularity of the 3.5kw Spindle Motor produced by a reputable 3.5kw Spindle Motor Manufacturer has grown significantly. This motor is an Air Cooled Spindle Motor that utilizes new and innovative technology to reduce weight and vibration, making it perfect for use in CNC machines. Choosing the right spindle can greatly impact the efficiency and accuracy of the machine, highlighting the importance of ensuring that the spindle is precisely designed for the task at hand. With computer numerical control, or CNC, this process is fully automated, allowing for high-precision tasks such as drilling, grinding, and cutting with minimal human intervention.

3.5kw Spindle Motor

The electric spindle has two primary features: constant torque and constant power. The torque is less expensive and comes in two variants- Air Cooled Spindle Motor and Water Cooled Spindle Motor. It operates along three aces: the horizontal x and vertical y -and the third z-axis, which introduces the third dimension. The key to CNC technology is the spindle, which moves along the z-axis to punch, drill or cut material as per movement along the x and y axes, and bring it into place. The spindle requires unparalleled precision provided by a particular type of electromagnetic motor. There are multiple motors for varying jobs, and this article will explore how to choose a CNC spindle motor.


Older versions of CNC motors use stepper motors, either built around permanent magnets drawn to their housings or magnetic housings to attract the rotor. In this latter model, the spindle can achieve higher speeds than it would with a permanent magnet in the rotor. Stepper motors are less popular and less powerful of the two motors most common to spindles. Stepper motors are sufficient for basic CNC applications, which implies that tasks requiring more power or precision call for another approach.


Servo motors are a more sophisticated version of the stepper motor. Though they are electromagnetic, their motors have lower pole counts than steppers. The critical difference between stepper and servo motors is the communication loop. Stepper motors operate on an open communication loop- they can receive signals only from voltage. Servo motors, on the contrary, use closed-loop communication, which means they send and receive signals from a controller. Servo motors work in collaboration with gearboxes so that high speeds are maintained at high torques, and when changes occur, servo motors can make up for these shifts. With incredible speed and acceleration, servo motors are the spindle motor of choice for most CNC applications. However, the disadvantage is that there are a greater number of moving parts in a servo than in a stepper motor, and that makes it more prone to failure.


Beyond the difference explained above, spindle motors come at varying maximum speeds. Just like in a car's engine, spindle speed is measured in revolutions per minute (RPM). The material being cut or drilled and the precision required in the job determines the spindle motor's necessary speed. The smaller the surface, the higher the spindle speed should be.


Spindle speed is important but is insignificant without torque. Torque is defined as the rotational force that forms the basic principle behind the operation of spindle motors. It is determined by force, radius and angle, and as the spindle speed increases, the torque naturally declines. Larger motors may produce higher torque. Low torque is sufficient for cutting wood, but higher torque is required for cutting steel.


The spindle motors can fail due to CNC machinery's high speeds and torque. Regular maintenance of a spindle motor is necessary to keep it functional and avoid failure due to overheating. Additionally, overloading should be completely avoided.


Different materials have different characteristics and require a different approach to cutting them. The materials intended to be cut will determine the type of spindle one should use.


Any spindle which does not have a metal component should be avoided. This is because they cannot handle the stress and could fail.


The right spindle size will determine the size of the tool to be used. The shaft diameter and shank diameter can vary and should be the correct size.

As a leading Spindle Motor Manufacturer, WHD Spindle Motor prioritizes performance and efficiency in their products. Their Air Cooled Spindle Motor line provides reliable, high-speed operation, making it perfect for CNC machines and other heavy-duty applications. And with an impressive power output of 3.5kw, these motors are capable of handling even the most demanding jobs. Choose WHD Spindle Motor for quality you can count on. Learn more about their products and services at