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Is it necessary to have detail drawing for original and symmetric parts?

Discussion in 'ISO 9001:2015 - Quality Management Systems' started by Giovana Tronco, Jul 14, 2016.

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  1. Giovana Tronco

    Giovana Tronco New Member

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    I work with mechanical design in an Industry and we are having an issue here.
    People don't want to detail symmetric parts anymore, only the oririnal part and ten place a note in the drawing mentioning the existence of an symmetric part and its code.
    What procedure should I adopt? separated or only one drawing?
     
  2. Miner

    Miner Moderator Staff Member

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    That would depend on a number of factors. How well your people can read drawings (operators, machinists, inspectors, engineers, etc.). How obvious the axis of symmetry and the symmetrical features are, etc.
    In the product in which I have past experience (automotive rear suspension components), separate drawings would have been necessary because the symmetry was complex and difficult to visualize.
     
  3. ncwalker

    ncwalker Well-Known Member

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    It's a question of risk.

    Case 1: Two prints. IF there are frequent changes, engineers can get sloppy and forget to change the symmetric part. So a few revisions in, features that are supposed to be symmetric have different dimensions. At which point you then wrestle with "which print is correct?" A symmetric print cures this.

    Case 2: A symmetric print. Only one. If you choose this route, like Miner says, it has to be a simple enough part so as not to be confusing. Also, I am assuming you are making these parts. Sometimes purchasing will make the bonehead decision to source symmetric parts at two different suppliers. In this case, one print will cause you tremendous pain.

    There is no "right" answer. Both ways can do the job. You have to weigh the risks and choose.
     
  4. Giovana Tronco

    Giovana Tronco New Member

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    Thnak you very much, it was helpful
     

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