Reaching ISO G0.4 Balancing Accuracy with a DIY Balancer, Turbine Project part 4

Balancing a high-speed turbine rotor to ISO standards is far more difficult than it looks. In this video (Part 4 of my RC turbine project), I redesign my DIY balancing machine to reach ISO 21940 G0.4 quality, equivalent to correcting an imbalance smaller than a 1 mm ball of sticky tack. Starting from the limitations of my previous design, I rebuild the rotor assembly, improve the mechanical setup, upgrade the sensor system, and implement advanced signal processing techniques on an ESP32. 🔧 What you’ll see in this video: • Why my previous balancer was not ISO compliant • Understanding ISO 21940 G0.4 requirements • Full rotor assembly with shaft tunnel and ceramic bearings • DIY hybrid ceramic bearing construction • Mechanical redesign of the balancing machine • BMI160 accelerometer vs ADXL335 • ESP32 signal processing: filtering and lock-in detection • Test mass balancing method • Achieving ISO-level imbalance in only two iterations 📂 Software & Files: • ESP32 / Arduino code: https://drive.google.com/file/d/1-5xk... • Excel balancing tool: https://drive.google.com/file/d/1p9A8... • 3D printed parts: https://drive.google.com/file/d/1Me_u... 📌 Previous video (Part 3): DIY Turbine Rotor Balancing 📌 Next video (Part 5): Dual-plane balancing and further improvements If you enjoy CNC machining, turbine engineering, sensors, and precision measurement systems, consider subscribing. Thanks for watching! #cnc #engineering #balancing #turbine #esp32 #diymachining #iso21940 #rcjet ________________________________________ ⏱️ CHAPTERS (TIMESTAMPS) 00:00 – Why my previous balancer was wrong 00:31 – About me & the RC turbine project 00:57 – ISO 21940 G0.4 explained 01:44 – Complete rotor assembly overview 02:05 – Shaft tunnel machining 03:16 – Nose nut manufacturing 04:03 – DIY ceramic bearing construction 05:57 – Shaft tunnel assembly 06:55 – Balancer mechanical redesign 07:11 – Electronics: BMI160 + ESP32 08:21 – First test and limitations 08:48 – ESP32 software and signal processing 09:54 – Test mass balancing procedure 12:18 – Achieving ISO G0.4 in two iterations 12:41 – Conclusions and what’s next