Multiple Activity Chart

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The Two-Hand Process Chart The two-hand process chart, sometimes referred to as an operator process chart is a motion study tool. This chart shows all movements and delays made by the right and left hands. Usually, it is not practical to make a detailed study through the two-hand process chart unless a highly repetitive manual operation is involved. Figure 4-17 on page 143 shows a typical two-hand process chart for a cable clamp assembly, with the times for each therblig obtained from stopwatch timing. It is usually less confusing to chart the activities of one hand completely, and then chart the other hand. Although there is no fixed rule regarding what part of the work cycle to use as a starting point, it is usually best to start plotting immediately after the release of the finished part. Since it is sometimes not possible to time individual therbligs, work elements might be comprised of several therbligs. For example, in Figure 4-17, the first element of the left hand is "Get U-bolt" which is comprised of a "reach" and a "grasp" therblig. It was not possible to time either of these therbligs individually because they occur too fast.
In summary, the two-hand process chart is an effective tool to:
1. Balance the motions of both hands and reduce fatigue.
2. Reduce or eliminate nonproductive motions.
3. Shorten the duration of productive motions.
4. Train new operators in the ideal method.
5. Sell the proposed method.

Multiple Activity Chart
This chart is similar to a Gantt chart but is used to show the interactions and interferences between the work of several working as a team and dependent on each other. It examines short cycle repetitive work and determines the utilization of operators and machines working in a group. It enables group work to be designed that is effective and operates with high productivity. Figure 54.4 shows a Multiple Activity Chart