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  • Die casting tolerancing. I'm confused

    Discussion in 'Metal casting & moulding' started by GarethW, Jun 7, 2010.

    1. GarethW

      GarethW Chief Clicker Staff Member

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      Please check out page 2 of the document that can be found at the link below:

      http://www.reicon.com.cn/UploadSoft/DIN ... %B7%AE.pdf

      I am looking at tolerance spec GTA 14 (table 1 on page 2). The table shows two lots of numbers: “intrinsic†and “not intrinsicâ€. Anyone know what this actually means? The “non-intrinsic†tolerances are much looser.

      Surely any dimension on a die casting is “intrinsic†to the die, because the die determines the shape of the casting??? How can features be cast that are “not intrinsic†to the die?
       
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    3. frleb1

      frleb1 New Member

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      Intrinsic specs means a specification relative to the element itself like: A diameter of 12mm +/- 0.5 mm.This is an intrinsic spec.

      Not intrinsic specs means a spec.relative to another element like: A distance of 50mm +/- 1 mm from hole to hole.

      Hope this will help.

      Francois
       
    4. GarethW

      GarethW Chief Clicker Staff Member

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      Thanks Francois, I understand what you mean with regards to geometry, but to make it more relevant to the casting process I have found the following explanation at this link.

      Intrinsic dimensions are those in the same parts of the tool.

      Non-intrinsic dimensions are those created by the interaction of movable tool components, e.g. wall thickness and base thickness or dimensions affected by additives or extenders.
       

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