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How do you attach a stepper motor to a lead screw?

Home > How do you attach a stepper motor to a lead screw?

How do you attach a stepper motor to a lead screw?

2023-11-23 09:18:49

Stepper motors can produce high torque at low speeds and are well-suited for driving screws. Stepper motors are used on many CNC machines, such as Lunyee's CNC desktop CNC router milling machine, where a screw with a threaded groove converts rotary motion into linear displacement, and a stepper motor provides discrete rotary steps for precise positioning. Do you know how to attach a stepper motor to a screw? Today we will discuss in detail the connection of stepper motors to lead screws.

Understanding components

To connect a lead screw to a stepper motor, you need to understand each component.

Lead screws: They are threaded shafts that convert rotary motion into linear displacement.

Stepper motors: Stepper motors are electric motors that move in discrete steps, allowing for precise positioning. The step angle of the motor determines the angular displacement of each step, which is translated into linear motion along the lead screw.

Connection method

There are several methods you can use to connect a lead screw to a stepper motor, but each has different characteristics.

Coupler: A coupler is a mechanical device that connects the shaft of a stepper motor to the nut of a screw. There are various types of couplers, such as beam couplers, bellows couplers, and flexible couplers, each suitable for different applications.

Direct coupling: Direct coupling involves mounting the stepper motor directly to the screw without the need for a coupler. This method offers the highest level of accuracy, but may require precise alignment and can transmit vibration.

Adapter: An adapter is a customized component that connects a stepper motor to a screw, typically used when the motor and screw have different shaft diameters or thread sizes.

Choosing the right connection method

The choice of connection method depends on the specific application requirements. For example for applications requiring high precision and minimal clearance, direct coupling or high quality couplings are recommended. For applications where space is limited or vibration transmission needs to be considered, couplings are the appropriate choice. For applications with non-standard shaft diameters or thread sizes, customized adapters are required.

Connection process

There are a few things to keep in mind during the linking process. When linking, you need to ensure proper alignment between the stepper motor shaft and the screw nut to minimize wobble and vibration. Secure the connection with appropriate fasteners such as screws, bolts, or clamps to ensure rigidity and prevent slippage. Once the connection is complete you can test the connection by rotating the stepper motor and observing the linear movement of the screw nut. Adjust alignment or tighten fasteners if necessary.


Connecting a lead screw to a stepper motor effectively enables controlled and precise linear motion, which is critical for a variety of mechanical and automation applications. By following these steps, you can smoothly connect a stepper motor to a screw.

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