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Craft software for dummies


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Craft software is a layouting tools mostly used in facility design.

Published in: Design, Technology
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Craft software for dummies

  1. 1. Facilities Design Alvin Adi K (2509100056) Rama P. Renspandy (2509100060) Andi Reza R (2509100063) Ikhsan Salman (2509100079) Arif Z. W (2509100147)
  3. 3. Definition Computerized Relative Allocation of Facilities Technique (CRAFT) is a tool that used to help improve the existing layout of the facilities. The facility is improved by swaping two or more departments to help arrange the facility to an optimal floor plan.
  4. 4. Inputs of CRAFT • From-To Chart • Cost Matrix • Distance (Determined) • Initial Layout
  5. 5. When will CRAFT be used? CRAFT is used when the number of departments is enormous that the manual computation would be nearly impossible to do. CRAFT is basically used with process layout approach, which also known as a functional layout that usually used in job shops or a batch production facility.
  6. 6. What does the CRAFT do? CRAFT do uses a pair wise exchange algorithm that may not return the optimal result because the final solution depends on the initial layout of the plant. Rather than examine all the possible swaps, CRAFT considers the swap of only adjacent department pair or pairs that have the same area.
  7. 7. Steps of using CRAFT : Basic step of CRAFT has been modified a number of times, but we use COFAD (Tompkins and Reed, 1976) as a reference, a four step algorithm, tackles the selection of MHS and layout. These are the following steps: 1. Determines an initial layout. 2. Selects an MHS for the layout obtained in the first step from a candidate list of equipment. 3. Calculates and revise the cost of each move based on material handling equipment to each move. (These three first step is repeated until a satisfactory solution obtained) To get a good-quality final solution, the user must provide different starting solution, evaluate the final solution obtained by CRAFT for each of these and choose the best one.
  8. 8. Example of CRAFT : This software (add-ins in Ms. Excel) needs several inputs to be defined, such as layout information, facility information, department information, flow matrix, and transportation cost. The input (in Ms. Excel) will be like:
  9. 9. Cont’
  10. 10. Cont’ The next step will be generate the end layout, by clicking the ‘define facility’ button.
  11. 11. Cont’ By clicking the ‘define facility’ button, the software will generate you the final solution layout :
  12. 12. Cont’ Then, based on final solution layout, the last part is evaluated the final solution for each of these and choose the best one. The output file generated layout itself can be classified into 3 parts:
  13. 13. Cont’ This part will give the detail information, such as area required, area defined, x-centroid, y-centroid, and the sequence. What method that used, how the assumption of the layout, the measure of the department distance also mentioned at the upper part.
  14. 14. Cont’ Six buttons can be utilized to enhance the visual layout, for instance, pressing the solve button will give the visual layout how the end solution visual layout look like :
  15. 15. Cont’ The last part explain how many iteration used and how much do it cost to make the layout :
  16. 16. Advantages of CRAFT : 1. The fact that the calculation is done by computer – sophisticated calculating machine – is clearly advantages that save a lot both time and money in the process. 2. It gives us rooms to define the variable and constraints that we have out here in the real world. 3. Flexibility can be seen as there are 6 buttons that can be utilized to generate series of different end solution (in figure 1.4)
  17. 17. Disadvantages of CRAFT : 1. Inefficient 2. Jobs time occured Jobs do not flow through in an orderly fashion, therefore backtracking occurs often. Idle time, more idle time may be experienced while workers are waiting for more work to arrive from different departments. 3. The (not) end result. End result may need to be modified, because once CRAFT has determined a solution it may need to be managed to create a layout that fits in the plant. 4. Greedy algorithm. It is the algorithm that always takes the best immediate solution. In contrary, a job shop that flow through the system is not always constant and causes fluctuations in the process.
  18. 18. THANK YOU