| Year | 1993 |
| Date | 30-Jul |
| Volume | 171 |
| Issue | 3,950 |
| Page | 168 |
| Category | Lathe |
| Part | |
| Title | Calculations for Lathe Change-Wheels |
| Author | D.P.Butson |
| Notes | Wrote a computer program to calculate ratios available for metric or Imperial threads on his Boxford lathe. The computer program, physical difficulties |