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2001 by CRC Press LLC The return on investments deals with leanness, namely on checking each addition or modification on its actual usefulness to increase item’s quality; and with economy of scope, namely on carefully monitoring aims and tasks on their ability of granting a positive value-chain, while avoiding unnecessary accomplishments and useless equipments. These new trends move to intelligent manufacturing set-ups, supporting: recovery flexibility, as option instead of set-apart resources; tactical flexibility, to approach optimal schedules assembly process; and strategic flexibility, for processing variable product mixes.

And require a considerable amount of propriety software; as a result, side costs are four to five times the robot cost; and • manipulation architecture supports poorly optimised motion for any particular task; even if sophisticated path planning and dynamics shaping options are provided, the duty-cycle time and position accuracy are worse than the ones of dedicated units. An alternative suggests that assembly equipment, built from modular units has to be considered [ACA96a], [Dre82], [GIU91], [MIL93], [Rog93], [TaA81]: • productivity preserves the figures of special purpose assembly lines; • reuse of the selected fixed assets into differently configured layouts makes possible amortisation plans based on sequences of product mixes.

The computer integration is a powerful contrivance; centrality, however, shall be left to the manufacturing flow, according to requirements of leanness, which say that non-necessary options are directly (since not fully exploited) and indirectly (because redundant accomplishment) nuisances. Summing up, important improvements are expected from the integrated control and management of the processing operations [ACA88c], [ACA89c], [ACA92b], [MIC92b], [MIC94d], with account of flexibility of the physical (the set-up) and the logical (the fit-out) resources.

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