Digit - Prosthetic Finger Prototype

Final Design

Digit - Prosthetic Finger - View 1
Digit - Prosthetic Finger - View 2
Digit - Prosthetic Finger - View 3

Objective

Design and assemble a tendon-driven robotic joint prototype using Polycarbonate to validate mechanical compliance and real-time kinematic tracking.

Process

  • Iterated mechanical joint designs in Onshape targeting a robust two-link testing rig within a strict three-day deadline
  • Manufactured the physical prototype using Polycarbonate and integrated brass heat-set inserts for rigid fixturing
  • Developed a custom Python tracking script utilizing OpenCV to isolate high-contrast fiducial markers via HSV color masking
  • Implemented trigonometric modeling using arctangent functions to calculate precise internal joint angles
  • Created a dynamic video overlay to output live flexion telemetry and automated quality control status

Skills used

  • Onshape (CAD)
  • Polycarbonate 3D printing
  • Hardware integration
  • Python for data tracking
  • OpenCV for computer vision

Results

Delivered a compliant tendon-driven test platform capable of real-time kinematic evaluation and automated range of motion validation, with integrated visual telemetry for mechanical analysis.