IE271_Lecture12

# Machine a machine b activity time min activity time

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Machine A Machine B Activity Time (min) Activity Time (min) Load 1 Load 1.5 Inspect 0.5 Inspect 0 Travel 0.5 Travel 0.5 Machine 7 Machine 6.5 Unload 1 Unload 1 L

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Man A1 A2 B UL A1 UL M(3) M(5.5) L A1 L UL A2 M(7) UL L A2 L UL B M(4) UL L L B M(1) 1 3 4 6 7 9 10 5.5 6 7 9 10
Cycle Time = 10 min Utilization Man: 9/10 = 90 % Machine A1: 10/10 = 100 % Machine A2: 10/10 = 100% Machine B: 9.5/10 = 95 %

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Gang Charts Gang charts are used when two or more people work together and their activities intertwine
Gang Chart An aid in studying the activities of a group of people together, a composite of individual member activity charts Covers the cycle followed by each member of the gang Those operations which are performed simultaneously by the members are indicated side by side

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Gang Chart (cont’d) An operation performed by one member of the group may continue while another member is performing more than one operation. The chart should cover the complete cycle for the longest performing member.
Gang Chart (cont’d) The chart should not be constructed from observation of a single cycle. The average condition should be reflected on the chart (e.g., the length of waiting time). The basic purpose of the chart is to analyze the activities of the group and then compose the group so as to minimize waiting time and delays while keeping the number of operators small.

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• Spring '10
• smith
• Cycle Time, The Work, Left-handedness, Gang Chart

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