4DOF DIY Acrylic Mechanical Robotic Arm Kit – Servo Controlled Robotic Arm for Arduino & STEM Projects

(Servos not included — requires 4× SG90 or MG90S servos)

🛠️ Recommended Servos (Buy Links)

1. TowerPro SG90 9 g Micro Servo (Plastic Gears)

• Ideal for lightweight builds.

• Specs: ~1.8 kg·cm torque, 0.10 s/60°, 4.8–6 V

• Buy here: RadioGearBD – SG90 Servo Motor

2. TowerPro MG90S Micro Servo (Metal Gears)

• More durable and slightly stronger than SG90.

• Specs: 1.8 kg·cm (4.8 V) → 2.2 kg·cm (6 V), metal gears, 0.10 s/60°

• Buy here: RadioGearBD – MG90S Servo Motor

✅ How to Choose:

• SG90: Lightweight and budget-friendly—great if your arm won’t carry heavy loads.

• MG90S: Metal gears endure more wear and handle higher torque—ideal for heavier grips or frequent use.

📝 Product Description:
Build and control your own robotic arm with this 4‑degree‑of‑freedom acrylic mechanical arm kit. Designed for STEM projects, makers, and hobbyists, it offers an easy-to-assemble platform powered by four micro servos (not included). Due to its compact size and lightweight construction, this kit is ideal for Arduino, Raspberry Pi, and other microcontroller platforms.

⚙️ Technical Overview:

• Degrees of Freedom: 4 (base rotation, shoulder, elbow, gripper)

• Material: Precision-cut acrylic parts

• Servo Compatibility: Requires 4× SG90 or MG90S micro servos (standard JR plug)

• Recommended Voltage: 4.8 – 6 V, standard 5 V MCU power

• Ideal For: Robotics, automation education, programming, and fun DIY builds