| Year | 1923 |
| Date | 07-Jun |
| Volume | 48 |
| Issue | 1,154 |
| Page | 596 |
| Category | Workshop Topics |
| Part | |
| Title | Making Screw Hobs for a Traversing Mandrel Lathe |
| Author | |
| Notes | Material of hobs and nuts, general proportions of hobs, form of hob thread, the diameter of hob, truth of hob when on mandrel, design of the hob attachment, to make a hob as in fig. 1, to bore and screwcut the half-nuts |