Full circular thread edge?

[LispResearch]

Hello, Gurus of drawing!

again a question of other topic: Me with me supervisor had a talk about thread representation. Yes, I know that thread should be represented with partial circular thread edge, but why is there a FULL CIRCULAR THREAD EDGE? I could not find any standard that uses this style. everywhere is partial circular thread edge used. Maybe somebody could reveal the darkness?

[JDMather]

Post reference links.

[LispResearch]

Here is a picture.
You can find it in Layouts - > Styles and Standards

[JDMather]

Hmmm, I was not aware that AutoCAD would even do automatic simplified representation of threads.

I suspect this is for AutoCAD Mechanical.

As far as the Standards question....  ...I don't know - I have always preferred the full circle (referencing Gieseck, et al Technical Drafting).

[steve216586]

I reference Delmar Technical Graphics Series, Technical Drawing, Fourth Edition and cannot find any representation of external or internal threads which uses a partial arc. They are all represented as full circles as shown in your image.

[Kent1Cooper]

Since this is not a version-specific or AutoCAD-specific question, you might catch the attention of more people who can cite references if you try over at the Drafting Techniques Forum.

[steve216586]

"...catch the attention of more people who can cite references ..."

Two posts already cited separate, legitimate, standard practices, resources.

You mean if you ask enough people, you might get the answer you want to hear?

[steve216586]

" I could not find any standard that uses this style."

Out of curiosity, I would be interested in seeing a design standards which use the partial circular thread edge. And what authority it represents.

[Kent1Cooper]

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@steve216586 wrote:

.... 

Out of curiosity, I would be interested in seeing a design standards which use the partial circular thread edge. And what authority it represents.

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Presumably the OP has more than one -- "everywhere is partial circular thread edge used" -- so they should be able to cite something.  I'm wondering whether the "standard" varies by geographical regions, or countries, or languages, or something.  [Just idle curiosity on my part -- I don't ever need to draw such things.]

[JDMather]

Specifically - my experience has been with ANSI/ASME Y14.41

[LispResearch]

Uh, found about my partial circular edge! These are standards which are most common in my region:

1) ISO 6410-3 (1993) - representation of screw threads and threaded parts

2) ISO 15786:2005 - Simplified representation and dimensioning of holes

And they use partial circular thread edge representation

Thank you JDMatter for the name of standard ANSI/ASME Y14.41 (at least I know now where to look for evidence of another style existence)

(Please forgive me for using this forum for such question)

[GrantsPirate]

FYI

ASME Y 14.6 - Screw Threads

You might have to look there instead.

I have several text books that show the hidden line unless the bottom is chamfered, then a solid circle is used.  I don't have the ASME standards as they are way too expensive.