TFE question. Mistake?

[KyoPhan]

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Another simple question about TFE.

I'm wondering if the curve requires a solid line or not. I always thought it did. Is this a mistake?

 

[Toothiemctooth]

No it's correct. The top arrow you drew is the bottom solid line - or the edge - of the end view.

All the dashed lines are apparent in the front view.

Bottom dash = the bottom right hand part of the L-shaped figure on the front view.

Middle dash = upward curvature of the half circle in the front views.

Top dash = the ledge you can see in the front view, it'd be hidden by the side view.

The round object is projected outwards, and is not hidden in the structure itself. If it were hidden - or pass through the structure - you'd see corresponding dashed lines in the top view through the structure. With these dashed lines being absent, we can deduce that the round object projects out of the face of the object only, and will be seen as a solid line in the sideview. Hope that helps.

 

[KyoPhan]

I'm going to simplify it.

From what your saying this should look like that? I would think that there should be a solid line to indicate that there is a change.

 

[FeralisExtremum]

I agree that there should be a solid line there.

 

[chlrbwls]

no.. there shouldnt be a solid line there because that would neglect the representation of the semicircle in the middle.

 

[FeralisExtremum]

There should be a solid line because there is a visible change in the depth from that view. It doesn't matter that it obscured the other depth changes behind it; you don't not draw a solid line because it would obscure a dashed line.

 

[KyoPhan]

There should be a solid line because there is a visible change in the depth from that view. It doesn't matter that it obscured the other depth changes behind it; you don't not draw a solid line because it would obscure a dashed line.

That is what I think as well. I'm confused on whether or not the 2nd example I gave needs a solid line or not, and this would give me the answer to my initial question. Can I get another opinion on this?

Thanks a lot.

 

[J777]

I don't believe there should be a solid line.. From the side view, the object would appear to be one column (ignoring the little nub). Since the bottom portion transitions from being rectangular to circular in a smooth fashion, no solid line should be observed. Think of it this way: if you were to run your finger along that transition, you would feel no sharp edge. Sidenote: Please do not interpret this sharp/smooth distinction as meaning that smooth surfaces don't have detectable lines. In this example, since this is one continuous shape, there is no way to detect the depth from a 2D side view. Thus, the dotted line representing the sharp groove in the middle portion (where the semicircle ends) would not be obstructed.

I hope this makes sense. Let me know if you need further explanation

 

[babowc]

It is correct.
There shouldn't be a solid line, because there is no distinct edge on the smooth semicircle, when looking at it from the end view.

Dashed lines represent the edges that you cannot see from that POV.

The answer key is correct.

 

[FeralisExtremum]

EDIT: babowc's right, if the curved surface doesn't make a distinct edge then it isn't considered a depth change.

 

[hunterx2]

the right side is all one piece there are no edges so no solid line