Question about ISO_13920 2

[SteelAndSteel]

It is possible to make a welding drawing of the item in the picture without adding any measurements, (if you have drawings on details 1 to 4), because the items is aligning with the edges of item 1. So what I wonder is who I shall interpret the general tolerance concerning distance in this case, because the distance is 0 from the edges.

 

[SteelAndSteel]

It think it is hard to avoid those standards since most European companies tend to have ISO 13920 and ISO 2768 in the drawing header.

About overall dimension. That would mean that 3 extra dimensions would be added on the drawing I posted on 22 Mar 14 12:30. But those dimensions would only indicate straightness flatness and parallelism?

For parallelism in ISO 13920, it states that it is valid for dimensions who are indicated. Indicated is a vague term (instead of a word like specified) and as CheckerHater stated ”o, 0 inch/mm, 0 degrees, 90 degrees and so on are usually implied and not specified on the drawing. ”. Was this how you derived your 10±0.5 tolerance pmarc?

 

[pmarc]

I used ±0.5=1 and the Table 3, because both surfaces shown coplanar on your drawing are 100 mm long (this falls within 30-120 range), and the tolerance class is F.

Perhaps it should not be understood that way, but this is not the main issue with the drawing you posted on 22 Mar 14 12:30. Even if you add 3 extra dimensions, this will not make this drawing unambiguous - at least in my opinion.