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Unformatted text preview: (i.e. such that the assembled variation is controlled, at the same time minimizing the manufacturing cost in a quality aspect). The 115 J.K. Davidson (ed.), Models for Computer Aided Tolerancing in Design and Manufacturing, 1 1 5 – 124. © 2007 Springer. 116 J. Lööf, T. Hermansson and R. Söderberg general tolerance allocation problem allows the tolerances to be chosen within a tolerance band. The discrete tolerance allocation problem, on the other hand, chooses from a finite set of available tolerances. In this paper, we aim to concentrate on the discrete tolerance allocation problem. That problem can be interpreted as a semi-assignment optimization problem with budget constraints, and is further explained in Section 3. This can be justified by the fact that it is in principle unrealistic that manufacturers can adjust the tolerances perfectly according to the optimal (continuous) solution. More often, the manufacturer can only choose between a finite number of machines and/or part manufacturers. This suggests that a discrete set of tolerances is more suitable. However, this...
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