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Thread: Symmetry lines / Center lines

  1. #1
    Associate Engineer
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    Symmetry lines / Center lines

    We all use symmetry lines or center lines in our mechanical drawings.
    But what standard (ISO) state that it is a requirement?

  2. #2
    Administrator Kelly Bramble's Avatar
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    Feb 2011
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    Bold Springs, GA
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    Center lines for both ISO and ASME (ANSI) engineering drawings are used to indicate that the associated feature is oriented perpendicular to the given engineering drawing view.

    It is a drafting practice, see ISO 128 -30, 40 and 50.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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