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    Discussion in 'The main mechanical design forum' started by Xenobius, Sep 19, 2015.

    1. Xenobius

      Xenobius New Member

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      Hi all,

      So its only weird to me because I cannot understand it but I am trying to draw https://www.sparkfun.com/datasheets/LCD/GDM1602K-Extended.pdf this LCD (page1) on a CAD application to learn a bit and the 4 mounting holes are labeled as "4 - O2.5"

      For me this means that the Diameter is 2.5mm but what is the 4? What does the 4 mean?
      As I write this question I realise that it may mean that all 4 mounting holes are of the same diameter? Could it be that?

      Thanks a lot
      C
       
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    3. maniacal_engineer

      maniacal_engineer Well-Known Member

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      typically that is done as "4x dia .025" or "dia2.5 4 plcs" but yes, I am pretty sure it means four places.
       
    4. FrankG

      FrankG New Member

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      I agree. It means 4 - 2.5mm diameter holes
       
    5. The_Inventor

      The_Inventor Member

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      I would be more concerned by the incorrect dimensioning of the LED grid pattern.
       
    6. Xenobius

      Xenobius New Member

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      Hey thanks everyone for your help :)
      Much Appreciated!

      In the same diagram I also found another one saying 16 - xxx for all the 16 pins
       
    7. nefthymiou

      nefthymiou Member

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      It means 4 holes ,of diameter 2,5 mm. An also 16-xx means 16 holes with a diameter of 1mm .(Simplified presentation of Dimensions -its a common Practice in Drawing of equal values or same things )
       
    8. marcus2of10

      marcus2of10 New Member

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      What may be part of the confusion is the 0 with a slash "/" through it in those callouts. In many CAD drawings that is the symbol for Diameter, not a zero.
       

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