Comparison with the old method
... shows both hands productively employed....
TABLE 1
| LEFT HAND | RIGHT HAND | ||
| 1. | Pick up screw | Pick up leather washer | |
| 2. | Assemble | Assemble | |
| 3. | Idle | Lay aside | |
| 4. | Pick up bracket | Pick up screw and washer assembled | |
| 5. | Hold bracket | Assemble | |
| 6. | " | " | Pick up flat washer |
| 7. | " | " | Assemble |
| 8. | " | " | Pick up lock washer |
| 9. | " | " | Assemble |
| 10. | " | " | Pick up nut |
| 11. | " | " | Start on thread |
| 12. | " | " | Pick up wrench |
| 13. | " | " | Tighten nut |
| 14. | " | " | Lay wrench aside |
| 15. | " | " | Pick up screw and washer assembled |
| 16. | " | " | Assemble to other side of bracket |
| 17. | " | " | Pick up flat washer |
| 18. | " | " | Assemble |
| 19. | " | " | Pick up lock washer |
| 20. | " | " | Assemble |
| 21. | " | " | Pick up nut |
| 22. | " | " | Start on thread |
| 23. | " | " | Pick up wrench |
| 24. | " | " | Tighten nut |
| 25. | " | " | Lay wrench aside |
| 26. | Idle | Lay bracket aside | |
TABLE 2
| LEFT HAND | RIGHT HAND | |
| 1. | Pick up screw and transport | Same |
| 2. | Position on block | Same |
| 3. | Pick up leather washer and transport | Same |
| 4. | Position on screw | Same |
| 5. | Pick up new bracket and transport | Pick up assembled bracket; lay aside |
| 6. | Position bracket on block | Same |
| 7. | Pick up flat washer and transport | Same |
| 8. | Position on screw | Same |
| 9. | Pick up lock washer and transport | Same |
| 10. | Position on screw | Same |
| 11. | Pick up nut and transport | Same |
| 12. | Start nut on screw | Same |
| 13. | Position driver | Same |
| 14. | Tighten nut | Same |
| 15. | Position driver to 2nd nut | Same |
| 16. | Tighten nut | Same |
| 17. | Release driver and move assembled bracket 2 in. forward on block | Same |
The new set-up consists of a hardwood block, shaped to fit one side of the bracket when assembled, and nailed to the bench. The open-end wrench was replaced by a screw-driver with a socket wrench to fit the acorn nut, suspended on a spring in front of the operator. The miscellaneous containers for holding the small parts were replaced by a supply of sheet-metal duplicate trays, so that the various parts could be located in the most convenient position. (This arrangement was not used in the accompanying illustrations because it obscured the view.)