| Year | 2021 |
| Date | 04-Jun |
| Volume | 226 |
| Issue | 4,666 |
| Page | 734 |
| Category | Workshop |
| Part | 2 |
| Title | Polygonal Holes & Rotary Broaching |
| Author | Jacques Maurel |
| Notes | Discusses the process of making non-circular holes. Spiraling problem, dividing unit, predrilled hole and chamfer, punch material, broaching thrust, making, reference |