Making of perpetual schedule involves two steps i

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Making of perpetual schedule involves two steps: i. Preparation of load analysis sheet from the orders in hand. Fig.23.2 shows a load analysis sheet. LOAD ANALYSIS SHEET ORDER NO LOAD IN HOURS/DAYS SECTION A SECTION B SECTION C X-320 X-210 X-314 Z-150 | | | 25 10 18 8 | | | 10 15 20 15 | | | 16 10 8 - | | | Fig. 23.2 Load Analysis Sheet ii. The total load against each section is added up and knowing the weekly capacity of a section, the number of weeks load against each department is calculated and plotted on a Gantt load chart as shown in fig. 22.3. GANTT LOAD CHART WEEK-1 WEEK-2 WEEK-3 WEEK-4 SECTION A SECTION C SECTION B Fig.23.3 GANTT Load Chart
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273 23.3.6 ORDER SCHEDULING It is a most elaborate technique. Fig. 23.4 shows an order schedule chart. Time is marked horizontally and the vertical axis shows the particular facility. The information required to generate an order schedule is, regarding the number of parts to be manufactured, name of the machines, their set up times, total production time and the date of completion of the order. ORDER SCHEDULE CHART JANUARY DATE FACULTY A FACULTY B FACULTY C 1 2 3 4 5 6 7 8 Fig. 23.4 Order Schedule Chart The scheduling is started by planning the last operation at the date of completion and then working backwards. For example, if order X takes 3 days to complete and it is to be delivered to the customer on 7 th of January, the work will be started on 5 th of January. Advantages (1) It is very detailed (2) The earliest possible completion dates can be met Limitations (1) It is very costly (2) It requires accurate time standards and good communication system (3) It is difficult to maintain effectively if there are many active orders. 23.3.7 LOADING BY SCHEDULE PERIOD The task is broken into different operations which will be required to turn raw materials into finished product. A Gantt type of chart as shown in fig.23.4 is employed for scheduling purposes. The rows, mark different facilities and each column denotes a time period. There are as many time periods as the number of operations. The first operation is carried out in the time period-1, second operation in time period-2 and so on. It is however not specified that within the time period when the operator will start and finish; but the operation is very much supposed to
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274 be completed during that particular time period. The shop supervisor does the detailed scheduling within the framework of the specified time period. ORDER SCHEDULE CHART FACILITY 1 2 3 TP-1 TP-2 TP-3 TP-4 TP-5 Fig 23.4 Load by Schedule Period Chart The shaded bars show the work ahead of each facility. This type of scheduling involves a longer in process time because only one operation is to be performed in one time period. However, this makes it more flexible as an operation can be taken up at the most convenient time within the specified time period. 23.3.8 PROGRESS CONTROL Once the actual production has started, it becomes essential to keep an eye at the progress of the work so that, if required, timely corrective action can be taken.
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