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Methodology

  1. Decide whether the DFA is focusing on manual or automatic assembly, different aspect templates can be used in AVIX

  2. Import MBOM  (if only a EBOM is available a MBOM can be built in AVIX)
    1. The parts in AVIX can carry/contain pictures to be used in the DFA
    2. 3D models can be used in parallel with AVIX, e.g. Adobe Acrobat Reader

  3. Decide the base object (set as N/AA, these will not be evaluated). E.g. a plastic casing containing other parts. This will typically be a sub-assembly containing other parts. The plastic casing is the base object.

  4. FollowDFA the MBOMevaluation
    1. If a work instruction/decided work sequence is available, follow it
      1. If not, follow the MBOM starting with the sub-assemblies
    2. Make the DFA evaluation according to the DFA aspects in AVIX
      1. Red and yellow (low score). Make a note in AVIX, assign responsible (do not fix the problem during the initial session)
    3. Try making red parts yellow and yellow parts green by design changes

  5. Improvements
    1. Make a copy/pastenew version of the entire MBOM, then make changes/improvements and a new MBOMversions of parts that has changed. (this assures that we have a present/future state to compare in terms of DFA-score


  6. Make a new DFA analysis on the copy/pastednew version of the MBOM
    1. Compare if it became better/worse
    2. Remember to compare not only total DFA-score, but also time. If a part is eliminated the total DFA score can go down making the result looking worse. But comparing the theoretical standard times will show a total assembly time reduction.
    3. Remember also to compare the relationship: Total DFA-score/Theoretical total score = Agg % DFX score when comparing present vs. future state of the design.

      Benchmark/best practice is considered to be 70%


The DFA-Regression

  • There is a clear relationship between e.g. number of customer complaints (part errors) vs. the DFA score.
      • Why? E.g. less parts = less quality issues

  • This implicates that there is a larger gain increasing the DFA score from e.g. 50-55% rather than from 80-90%

  • This should be considered when choosing between different design improvements, maybe the 80-90% is not worth the investment…

 

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