| Year | 2020 |
| Date | 31-Jul |
| Volume | 225 |
| Issue | 4,644 |
| Page | 196 |
| Category | Workshop |
| Part | 3 |
| Title | Tempering and Gear Cutters |
| Author | Martin Gearing |
| Notes | Making Four Tooth Gear Cutters. Discusses the use of his button cutters for making involute gears. Making the two mandrels, making the button forming tool, making and forming the cutter, cutting the gear, did you notice? Realistic times |