Data material, mean exposure, and exposure variability at job and task levels for machinists
| Job | Regular lathe | Break | CNC*: Lathe turning Programming | Grinding Surface grinding | Other assembly | CNC*: Setting up Milling Drilling | Large lathe/ drilling machine/ machine centre | Assembly at fitter’s bench | Milling cutter | Upright drilling machine | Unspecified | Bench drilling machine | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| All tasks occurring in the diaries are shown, ordered according to decreasing proportion of daily measurement time. The task category “unspecified” was formed a posteriori for periods with insufficient task information. | |||||||||||||
| sBS2, sBD2, variance between subjects and between days (within subject), respectively. | |||||||||||||
| *CNC, computer operated numerically controlled tools. | |||||||||||||
| Data material | |||||||||||||
| Subjects | 26 | 8 | 26 | 6 | 4 | 10 | 6 | 2 | 6 | 2 | 5 | 5 | 0 |
| Days/subject | 4 | 3.5 | 4 | 3.8 | 4 | 2.3 | 3.5 | 2.5 | 2.1 | 2.5 | 1.8 | 1.8 | 0 |
| % of daily measurement time | |||||||||||||
| Mean | 100 | 20.4 | 14.5 | 13.9 | 13.4 | 12.8 | 10.1 | 2.0 | 4.9 | 2.0 | 1.8 | 1.8 | 0 |
| Range | 0–94.8 | 4.6–59.8 | 0–92.8 | 0–93.6 | 0–95.4 | 0–94.5 | 0–61.0 | 0–92.1 | 0–61.0 | 0–34.1 | 0–34.1 | ||
| Exposure variables | |||||||||||||
| % time >90° | 0 | ||||||||||||
| Mean | 1.6 | 1.1 | 1.6 | 0.8 | 0.8 | 1.0 | 1.2 | 5.4 | 0.6 | 5.4 | 5.9 | 5.9 | |
| varBS | 2.8 | 0.8 | 2.8 | 0.0 | 0.1 | 0.5 | 0 | 0 | 0.3 | 0 | 99.2 | 99.2 | |
| varBD | 0.9 | 1.2 | 8.2 | 0.3 | 0.2 | 0.6 | 1.3 | 11.6 | 0.0 | 11.6 | 23.8 | 23.8 | |
| % time >90° at least 5 seconds | |||||||||||||
| Mean | 0.9 | 0.6 | 1.3 | 0.5 | 0.4 | 0.6 | 0.8 | 3.7 | 0.4 | 3.7 | 1.2 | 1.2 | 0 |
| varBS | 0.4 | 0.5 | 2.5 | 0.0 | 0.0 | 0.1 | 0 | 11.5 | 0.3 | 11.5 | 1.4 | 1.4 | |
| varBD | 0.6 | 1.1 | 7.6 | 0.2 | 0.1 | 0.7 | 1.4 | 1.6 | 0.0 | 1.6 | 0.3 | 0.3 | |