Drawing Threaded Holes: Correct Representation?

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Discussion Overview

The discussion revolves around the correct representation of threaded holes in technical drawings, specifically focusing on side views and the use of hidden lines versus other views. Participants explore the conventions and best practices for illustrating these features in both CAD and hand-drawn formats.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant seeks clarification on the correct representation of threaded holes in a side view drawing.
  • Another participant mentions that there is a special line type for filling in threaded holes, referencing the "alphabet of lines" as a resource.
  • A participant expresses concern about including hidden lines in the side view, suggesting that it may cause confusion.
  • There is a suggestion to avoid hidden lines and instead use multiple views (front, side, top) to represent features more clearly.
  • One participant proposes using section views for certain holes based on their geometry and importance, contrasting this with hand-drawn techniques.
  • A method for showing a threaded hole using a concentric arc around the hole is described, with a link to an illustrative example.

Areas of Agreement / Disagreement

Participants express differing opinions on the use of hidden lines and the best approach to represent threaded holes, indicating that multiple competing views remain on the topic.

Contextual Notes

Limitations include the lack of consensus on the use of hidden lines versus multiple views and the specific conventions referenced, such as the "alphabet of lines," which may depend on different drawing standards.

eurekameh
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I'm trying to draw the side-view and I'm having a bit of trouble. Is what I drew correct, or is there some kind of special representation for threaded holes?
 
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Yes, there is a special type of line used to fill in the area of a threaded hole. Look it up in the alphabet of lines. Everything you have so far is fine, you just need more.
 
What else is needed? I know there's a hole at the top, but it'd be to confusing if I tried to include that in the side view as hidden lines.
I also know dimensions should be included, but I'm omitting them for the purpose of this post. Thanks!
Edit:
Btw, what do you mean by the alphabet of lines? I tried looking it up, but is it some sort of chart or table?
 
In general avoid hidden lines wherever possible. It's always preferable to do a another view to show the feature properly.

In this case I wouldn't use any hidden lines. I'd do a front view, side view on the other side and a top view. The two holes at the front can be called out and positioned from the top view as through holes. Same with the two on the front face.

Depending on the geometry and the importance of the through hole on the diagonal face, I'd do that as a section view, and the same with the large hole on the top.

I'd do that because I use CAD. If I were drawing by hand I wouldn't do the section views, but show the hole on the diagonal as hidden lines.

You can show a threaded hole by a concentric arc that goes around the hole in question, http://media.photobucket.com/image/threaded hole/S_PK/019cdcdd.jpg
 

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