| Year | 2015 |
| Date | 01-May |
| Volume | 214 |
| Issue | 4,507 |
| Page | 641 |
| Category | Road Locomotive |
| Part | 2 |
| Title | Worm Wheel and Worm Design and Manufacture |
| Author | Andrew Johnston |
| Notes | Describes his use of CNC to perform a complex piece of machining. Designing and machining the hob, machining the worm wheel, conclusion, reference |