3 DOF (Degrees of Freedom) Robotic Arm

🪵 Material & Plates

• Laser‑cut sheets (usually 2–3 mm plywood/MDF)

• Four rectangular panels each containing:

  • Base plate with mounting holes for turntable/servo

  • Shoulder & elbow link plates (long slender arms with slot‑in joints)

  • Wrist/effector plates (claw‑like gears and end‑effector cutouts)

  • Servo mounting blocks (rectangular pieces with servo body cutouts)

🔩 Hardware Kit

• Screws, nuts & nylon spacers for stacking plates and affixing servos

• Washers to space moving links apart

• Brass or nylon standoffs to create pivot points (bushings)

🤖 What It Becomes

• 3 Degrees of Freedom:

  • Base rotation (yaw) via a standard hobby servo

  • Shoulder pitch (up/down) via second servo

  • Elbow pitch (up/down) via third servo

• Optionally add a fourth micro‑servo for a simple gripper or “wrist”

🛠️ What You’ll Need (in Addition)

• 3–4 standard micro servos (e.g. SG90/MG90S)

• Servo controller (Arduino, PCA9685, etc.)

• Power supply (5–6 V for servos)

• Basic hand tools (screwdrivers, pliers, hex keys)