Maker Robotic Arm

Course Overview

Build the same six-joint modular robotic arm as the Gr.4-6 course, but go deeper. Older students tackle more complex engineering — calibrating joints for precision, understanding the electrical architecture, writing programmed sequences, and solving real automation challenges. By the end, your arm will complete multi-step tasks autonomously.

What You’ll Build

A fully functional robotic arm made from standardized, interchangeable modules:

• Rotary Base — Gear-driven 360-degree platform with ~20:1 reduction ratio
• 3 Joint Modules — Belt-driven shoulder, elbow, and wrist with interchangeable pulley ratios
• Wrist Rotation — Compact 360-degree servo rotation module
• Claw / Gripper — Servo-driven end effector for grabbing and manipulating objects

All structural parts are 3D-printed in PETG carbon fiber for strength and durability. The modular design means these components can be reconfigured for future projects.

What You’ll Learn

• Precision Mechanical Assembly — Build with attention to alignment, belt tension, and calibration
• Electrical Architecture — Understand the Brain Module vs Motor Controller separation and why it matters
• Manual Axis Control — Select and move individual joints through the touchscreen interface
• Teleoperation & Motion Recording — Control the arm with the teaching arm, record sequences, and play them back
• Programming Logic — Write movement programs with loops, speed control, and multi-step sequences
• Automation Challenges — Program the arm to complete timed pick-and-place tasks with precision

Course Structure

This is a 10-week session-based course:

1. Engineering Principles — Torque, gear ratios, mechanical advantage, and the modular system
2. Base & Gear Reduction — Assemble and calibrate the rotary base
3. Joint Assembly & Belt Tensioning — Build shoulder, elbow, and wrist with precision
4. Gripper & Wrist Rotation — Optimize the gripping mechanism and end effector
5. Wiring & Power Architecture — Motor controller, stepper drivers, and servo connections
6. Brain Module & Homing — ESP32 setup, limit switches, and automatic homing sequences
7. Manual Axis Control — Individual joint control, speed tuning, and calibration
8. Teleoperation & Recording — Teach-by-motion control with motion capture and playback
9. Automated Task Programming — Multi-step sequences for real-world challenges
10. Demo Day — Timed precision challenge and project showcase

Prerequisites

• Age: Grades 6-9 (ages 11-15)
• Experience: No prior experience required
• Interest: Curious about building, robotics, and programming