Shaft design checker with fatigue and deflection

The brief

Shaft design is a chain of hand calculations that engineers repeat for every project and sometimes get wrong. Build a Python tool that takes loads, speed and material, checks static strength, fatigue life and deflection, and reports the safety factor with each step shown. Good looks like: results that match a textbook worked example, clear units, and a plot of how the safety factor changes with diameter.

What you will build

1. List the design equations from a standard text
2. Code static strength, fatigue and deflection checks
3. Verify against a worked textbook example
4. Plot safety factor against diameter and material
5. Add a bearing-life check
6. Write a one-page design report

Free, open data to build it with