4-Finger Robotic Arm Mini Mechanical Gripper Kit with N20 Motor

The 4-Finger Robotic Arm Mini Mechanical Gripper Kit with N20 Motor is a compact and educational robotic gripper designed for DIY robotics, robotic arm projects, STEM education, mechanical engineering demonstrations, and prototyping. Featuring a synchronized four-finger gripping mechanism, this mini gripper provides an engaging way to explore how motors, gears, linkages, and mechanical structures work together to create controlled gripping movement.

The gripper is constructed using 3 mm black acrylic plates combined with 3D-printed components and is powered by a 6V N20 geared motor. Its compact size and lightweight construction make it suitable for desktop demonstrations as well as integration with compatible robotic arms and custom mechanical platforms.

Four-Finger Synchronized Gripping Mechanism

The gripper features a four-finger mechanical gripping design in which the fingers operate together through the motor-driven transmission mechanism.

When the N20 motor rotates, the mechanical transmission moves the fingers simultaneously to create a coordinated gripping action. This makes the gripper useful for demonstrating fundamental concepts related to mechanical synchronization, motion transmission, and robotic manipulation.

The gripper is intended primarily for lightweight objects and educational demonstrations rather than heavy-duty industrial gripping.

N20 Motor Driven

The included 6V N20 motor provides the mechanical power required to operate the gripping mechanism. N20 gear motors are compact and well suited for small robotic mechanisms where space and weight are important considerations.

The motor can be integrated with suitable control electronics to operate the gripper in a custom robotics project. For Arduino or other microcontroller-based applications, an appropriate motor driver or H-bridge circuit should be used rather than powering the motor directly from a microcontroller GPIO.

Acrylic and 3D-Printed Construction

The main frame uses 3 mm black acrylic plates, combined with selected 3D-printed mechanical components. This construction keeps the gripper relatively lightweight while providing a rigid structure for demonstration and prototyping.

The acrylic frame also allows users to see the internal mechanical arrangement and observe the movement of the transmission and gripping fingers.

Because the product combines laser-cut acrylic and 3D-printed components, minor variations in surface finish, edges, dimensions, or appearance may occur. These variations are normal and generally do not affect the intended operation when the kit is assembled correctly.

DIY Assembly Kit

The gripper is supplied as an unassembled DIY kit, giving users the opportunity to construct the mechanism themselves.

Assembly provides practical experience with:

• Mechanical components
• Gear and transmission systems
• Motor installation
• Linkages
• Fasteners
• Robotic gripper mechanisms
• Mechanical alignment

Careful assembly is important because incorrect alignment or excessive force can damage acrylic or 3D-printed components.

Suitable for Robotic Arms

The compact design allows the gripper to be incorporated into suitable DIY robotic arms and custom robotic platforms. It can be used as an end-effector for experimental robotic systems where lightweight gripping is required.

Before mounting the gripper to a robotic arm, ensure that the arm can safely support the 102 g gripper weight plus the weight of any additional mounting hardware and payload.

Educational and STEM Applications

The 4-finger gripper is particularly useful for teaching and demonstrating basic robotics and mechanical engineering concepts.

It can be used to explore:

• Robotic gripping mechanisms
• Motor-driven motion
• Mechanical transmission
• Synchronized movement
• Linkage systems
• Mechanical design
• End-effector concepts
• Basic robotics control
• Prototyping techniques

Its compact construction also makes it suitable for classroom demonstrations, laboratory experiments, workshops, and desktop displays.

Arduino and Custom Control

The N20 motor can be controlled using suitable electronic hardware, making the gripper compatible with custom robotics projects.

For example, users can integrate it with an Arduino, ESP32, Raspberry Pi-based control system, or other compatible controller by adding an appropriate motor driver and power supply.

The controller and motor driver are not included unless specifically stated in the package contents.

Compact and Lightweight Design

The gripper measures approximately 13 × 11.7 cm and weighs around 102 g, making it suitable for compact robotic platforms and desktop demonstrations.

Its lightweight construction is especially useful for small robotic arms where minimizing end-effector weight helps maintain stability and reduces the load on the arm’s motors.

Key Features

• Four-finger synchronized mechanical gripper
• Includes 6V N20 motor
• Made from 3 mm black acrylic plates
• Includes selected 3D-printed components
• Compact and lightweight construction
• Suitable for DIY robotic arms
• Ideal for STEM and mechanical education
• Suitable for desktop demonstrations
• Can be integrated with Arduino and custom control systems
• DIY unassembled design
• Suitable for lightweight gripping applications

Specifications

Applications

The 4-Finger Mini Mechanical Gripper can be used for:

• Robotic arm projects
• DIY robotics
• STEM education
• Mechanical engineering demonstrations
• Arduino robotics projects
• ESP32-based robotics
• Robotic end-effector development
• Mechanical structure teaching
• Robotics research and prototyping
• Desktop mechanical displays
• DIY automation projects
• Lightweight object gripping experiments

Package Includes

• 1 × 4-Finger Acrylic Mechanical Gripper Assembly – Unassembled
• 1 × N20 Motor
• 1 × Set of Mounting Screws and Accessories

Important Notes

• This product is supplied as a DIY unassembled kit and requires self-assembly.
• A suitable 6V DC power supply is required for the motor.
• Controller boards, motor drivers, batteries, and robotic arms are not included unless specifically mentioned.
• Use an appropriate motor driver when controlling the N20 motor with Arduino, ESP32, or another microcontroller.
• The gripper is designed primarily for lightweight gripping and educational applications.
• Do not apply excessive force to the acrylic plates, fingers, gears, or 3D-printed components.
• Due to the use of 3D printing and laser-cut acrylic fabrication, minor surface imperfections or dimensional variations may occur.
• Improper assembly or excessive force may result in damage or breakage.
• Robosap is not responsible for damage or breakage caused by improper handling, incorrect assembly, excessive force, or misuse.
• Product appearance may vary slightly from images due to manufacturing and material variations.

Why Choose the 4-Finger Mini Mechanical Gripper?

The 4-Finger Robotic Arm Mini Mechanical Gripper Kit with N20 Motor provides a practical and engaging way to learn about robotic manipulation and mechanical motion. Its four synchronized fingers, compact acrylic frame, 3D-printed components, and N20 motor make it an excellent choice for DIY robotics, STEM education, prototyping, and custom robotic arm projects.

Whether used as a classroom demonstration, a robotic arm end-effector, or a mechanical experimentation platform, this kit offers hands-on experience with the fundamental principles behind motor-driven robotic gripping systems.

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