A factory makes two items in two operations performed in the same sequence time after time; dispatch is without overlap. Item X takes four man-hours, three of them spent on the first, and the other one on the second operation, and item Y the same, but this time with one man-hour devoted to the first, and the other three to the second operation. The two items are combined into one factory order involving two four-hour jobs consistent with ‘identical throughput times × equal amounts of capacity’ and the advantages this offers, namely that capacity, represented by two operators (plus machines), orders in progress and throughput time per operation, are all minimal (figure 6.la). However, proper sequencing does permit some overlap (figure 6.1b).
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- Frequent ‘work’ mixes
J. J. Verzijl
- Macmillan Education UK