Ergonomics as Significant Factor of Sustainable Production - Technology Management for Sustainable Production and Logistics - page 194

FPY for soldering

100%

80%

K1

60%

K2

40%

K3

20%

K4

K5

0%

1 2 3

production shift

Fig. 1 Visual inspection of soldered components in three shifts working system

FPY for coating

100%

80%

60%

K3

40%

K4

K5

20%

0%

1 2 3

production shift

Fig. 2 Visual inspection of conformal coating coverage in three shifts working system

of defect location on products effectiveness changeability differs but only slightly
between production shifts. Real disproportion of effectiveness between morning,
afternoon and night shifts results from changeability of operators performance,
trained to work on different inspection stations.
Taking into consideration source production data on single operator level pre-
sented in Fig. 3 and Table 3 difference in inspection effectiveness can be noticed.
Differences are the result of unique for each person abilities and limitations to
work in different hours during and day and night rhythm. Each operator activity is
not the same in biological day and night rhythm and relates either to occupational
time or private time.
On chart in Fig. 3 it is visible that in population of operators for visual inspection
are operators who work more effective on morning shift (ex. OP1 and OP6) compar-
ing to the rest. Moreover it should be noticed that they are also operator working in a