04Lecture-ch14

# 04Lecture-ch14 - NGR3300U Integrated Manufacturing Systems...

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NGR3300U – Integrated Manufacturing Systems Lecture 04 Analysis of Single Station Manufacturing Cells Section 14.4 Manual cell – manual lathe/mill Semi-automated cell – CNC mill/lathe, operator loads/unloads Fully automate cell – CNC mill/lathe with robotic load/unload, automated pallet changer (1) Determine # of stations/machines to satisfy production requirements # of stations = Workload for week Hrs available for week on a machine to perform workload (2) Determine # of stations/machines to assign to worker in a machine cluster 1. Number of Workstations required What is total workload (hr of work/week)for a given period? WL = Workload = QT c Q = quantity to be produced during period (pc/hr or pc/wk) T c = cycle time (hr/pc) Number of stations required = Time Available WL n = Example 1 A CNC mill dept produces 50 gears / week. The time to machine each gear is 2mins. What is the total workload for the week? 1

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Example 2 Each week, a CNC mill dept produces 50 type A and 20 type B gears. The time to machine a type A is 2mins and type B is 3mins. What is the total workload for the week? Example 3 800 shafts must be produced in the lathe section of the machine shop during a particular week. Each shaft requires machine cycle time T c = 11.5min. How many lathes do we need if there are 40hrs of available
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04Lecture-ch14 - NGR3300U Integrated Manufacturing Systems...

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