SUBJECT : AUTOMATION, PRODUCTION SYSTEMS, AND COMPUTER-INTEGRATED MANUFACTURING

TOPIC : GROUP TECHNOLOGY AND CELLULAR MANUFACTURING

18.12 A group-technology cell has three machines and is used to process a family of four parts. The table below lists production quantities(Q), production times (Tp)), and machine frac- tions for each family memberg). Assume the nonoperation times (10) are all the same at 40 min per machine. Determine (a) average hourly production rate for the cell, (b) utiliza- tion of each machine and average utilization of the cell, (e) manufacturing lead time, and (d) work-in-process. A spreadsheet calculator is recommended for this problem. Machine 1 Machine 2 Machine 3 Part faj A B C D O Tp (min) 1 4.0 2.0 5.0 1 4.0 1 1 0.4 0.2 0.1 0.3 Tp2 (min) 2 3.0 0.3 4.0 0.4 6.0 0.12 2.0 0.15 Tpa (min) 2.0 1.8 2.5 3.33 0.2 0.18 0.05 0.25