History

The Gantt Chart

Name: The Gantt Chart
Author: Wallace Clark
ISBN: 9781231112052

by Wallace Clark

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Synopsis

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ...the next was grinding on machine G340; etc. The lines show that the orders then in the department would keep the first machine busy for only 4 weeks; the second machine, G340, would have no work during the first week and about half a week's work for each of the next 4 weeks; the third machine, D401, would be busy the whole of the first week, but have nothing to do the second week. The chart emphasizes the fact that the operations were not well balanced, i.e., it took so long for some machines to do their part of the work that those on succeeding operations would have to stand idle a part of the time. For instance, the first machine, although it ran all the time for 4 weeks, would keep the second and third busy only part of each week. The chart made it clear that the first operation should be speeded up by some means in order to manufacture these parts economically, and an investigation revealed that improved jigs and fixtures were needed. As to the cutter bars, the chart made it clear that the orders then in the department could not be completed on the last operation for about 11 weeks, and that the breakdown of a machine or the absence of an operator would have a serious effect on the output of the department. In a drop forge plant it is necessary to promise delivery on each order and that delivery depends largely on the work already assigned to the hammers. A Load Chart (Figure 23) shows how far the capacity of the hammers is taken up by orders already entered. The amount of work ahead of any manufacturing plant constantly varies and the management must be able to change its plans as quickly as the work changes. Whatever action is taken, must be based on accurate information as to the status at that particular time--never Figure 23. Load Chart For A Drop ...