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  1. David HG

    ISO 13920 Parallelism reference?

    Hi, At the least, I see no tolerance class on the drawing, so how can the correct row be chosen. Tolerance is ISO 13920-BF. Also, it looks like it's applied to centerlines/centerplanes of slots rather than surfaces. It would not apply to the reference overall dimension. The 1365±3 measure is...
  2. David HG

    ISO 13920 Parallelism reference?

    Hi all, Just to note if its not desirable to give a specific answer to the specific issue above, its completely fine to only answer: How do I interpret usage of the nominal size l in Table 3?
  3. David HG

    ISO 13920 Parallelism reference?

    Hello, Please find attached picture of our drawing of a part. (High quality in attachments in the bottom of this page). I've marked two brackets in yellow. I want to find out what parallelism tolerance is between these two mounting surfaces. Is it correct to use the green marked dimensions as...
  4. David HG

    ISO 13920 angle tolerances

    Hi Burunduk, "Bear in mind that extension lines' length is not relevant to the determination of the length of the angle legs." I guess this is where my confusion came from. Looking at the standard the length was always extended to a reference point. Having the reference point removed I assumed...
  5. David HG

    ISO 13920 angle tolerances

    Hi Burunduk, See picture below. The centerline is based on plane A and B. The horizontal cylindrical length is 10mm. The yellow bracket is 230mm. If I understand your implication correctly, do you mean the cylindrical surface is actually the short leg? How could I visually represent this...
  6. David HG

    ISO 13920 angle tolerances

    Burunduk, Ah I see. Thank you for your help! Can you confirm the visual representation of the legs looks like this then: (Short leg = Length of bracket. Long leg must still be aimed at the feature the angle is taken from (cylinder at the RHS end), and 5° text placement doesn't matter you said...
  7. David HG

    ISO 13920 angle tolerances

    Hi Burunduk, Sorry for the confusion, but the centerline is continuous, I've edited out features to try sensor the drawing, and the middle of the centerline was deleted in the picture editing software. "[...]it seems by the proportions that the bracket is the shorter leg" So do you mean "l" =...
  8. David HG

    ISO 13920 angle tolerances

    Hi Burunduk, 3. 5° angle feature: Bottom leg: Horizontal reference point extending to the RHS end of distance L3. This is the centre of a round machined surface. Do you mean the base leg should be from the 5° to the horizontal start of height H1?
  9. David HG

    ISO 13920 angle tolerances

    @Burunduk 1. You write "I", do you mean I, or lower case l. In the standard I only see reference to lower case l which seems to be the hypotenuse in the examples. 2. So in the figure in my previous post I shall extend the green line to the end of the base leg? 3. So I can better understand...
  10. David HG

    ISO 13920 angle tolerances

    Hello! I'm David, a Quality engineer working at Doosan Infracore Norway. I've questions about ISO 13920 regarding the angular tolerance setting. I've attached the specific part of the standard below and highlighted some points in question. Below are my questions in an image format. I'll also...

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