Tangent lines on Isometric views

[lmdrafting]

Hello,

Is it standard to keep tangent lines shown on isometric views? Please see the sample file attached. For this particular part, it doesn't seem like it adds clarity by keeping the tangent lines. It seems more confusing for me to have them, but that could just be me. I typically prefer no tangent lines, but according to Y14.4M-1999 section 3.4 Fig 16c, tangent lines (phantom lines) are acceptable as a substitute.

Lisa

 

[KENAT]

You've already looked in the standard. My rule of thumb on such things is to show them if it adds clarity, not show them if it gets confusing. The phantom line thing can help.

I will say this about the drawing you link, it seems as if phantom and hidden lines are a bit mixed up, it's difficult to tell what's going on.


KENAT,

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[CorBlimeyLimey]

In your example I would show the tangent edges as solid or, if possible, in shaded without edges mode.

 

[KENAT]

Shaded without edges has no place on a formal drawing.;-)

KENAT,

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[powerhound]

As stated above, those phantom lines are messing up the view. That's why it doesn't seem any more clear with them there. You should change the tangent lines to solid and then keep them turned on. I can see where not having them on a part like this can leave much to be desired in the clarity department.

Powerhound, GDTP T-0419
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[cadman1964]

I agree with powerhound, turn them to solid lines.

Solid Edge V20

 

[ewh]

I don't think it would really help to make them solid. I would make the line weight thin, though.

"Good to know you got shoes to wear when you find the floor." - [small]Robert Hunter[/small]

 

[CorBlimeyLimey]

"Shaded without edges has no place on a formal drawing"

Well it should ... "if it adds clarity"

 

[ModulusCT]

I only show hidden lines in a view if it adds clarity and is essential to fully describing the part.

Perhaps if they were shut off it would be easier to read.

 

[powerhound]

But Modulus, those aren't hidden lines, they are tangent lines, which kind of makes the point that they should be solid. Leaving them as phantom lines only adds to the confusion...as we are seeing here.

Powerhound, GDTP T-0419
Production Manager
Inventor 2009
Mastercam X3
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II

 

[KENAT]

Powehound, to me it looks like some are tangent and some are hidded but it's difficult to tell which is which, hence my comment originally.

KENAT,

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What is Engineering anyway: faq1088-1484

 

[ewh]

I don't really see the confusion as it is shown currently. If hidden lines were visible it would be a different matter.

"Good to know you got shoes to wear when you find the floor." - [small]Robert Hunter[/small]

 

[lmdrafting]

thank you all for your advice. I have a stack of drawings all done in a similar fashion (by the same person) with numerous phantom lines in view...some even on 2D views. It is my opinion that it doesn't add clarity, but the engineer is demanding a hard requirement that states that tangent lines should not not be shown. I guess because I'm a checker he feels he is above a drawing check.

 

[KENAT]

The diagonal lines were throwing me, and some of the I presume "phantom lines" appear to be hidden line style, probably the way your CAD system scaled it.

I agree with you that it doesn't add any clarity for the most part based on your sample.

KENAT,

Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:

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What is Engineering anyway: faq1088-1484

 

[PeterStock]

What I see is that there are no hidden lines, the solid lines are edges or silhouettes and the phantom lines are tangents. I do not see the confusion. My personal preference is to show tangent lines a dimmed, they have a solid font, but are lighter than edges. If dimmed is not available as an option, phantom makes sense.

Peter Stockhausen
Senior Design Analyst (Checker)
Infotech Aerospace Services

 

[swertel]

I'm questioning why there are tangent edges shown on the orthographic projected views. I haven't found many, if any, parts that required tangent edges to be shown on orthographic views. I only show them on isometric views. Perhaps the part would be clearer if they were removed from the orthographic projections but were left on in the isometric projection.

--Scott

http://wertel.eng.pro

 

[lmdrafting]

PeterStock - how about this sample print attached. Does it add clarity to have all tangent lines shown? Even on 2D views? Where do you draw the line? Who makes the call that the phantom lines stay or go? As a checker, if it is confusing to me....do I tell the Engineer to remove them? He will argue that they stay. It is almost easier to implement consistency by saying all or nothing (in this case no tangent lines). If I leave it to decide on a case by case basis....I'm sure each pair of eyes that view the drawing will see it differently.

Lisa

 

[KENAT]

lthurner, get rid of them. Last I heard checker usually has final say.

(Of course, not where I work when I was checking which made it fun).

KENAT,

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[lmdrafting]

%-)I totally agree! I think it is because I'm a female that I'm sometimes not taken seriously when I return prints to Engineers and its covered in red ink. Although, I've been a checker here for the last three years. He is the first to challenge every redline I have made.

Thanks Kenat...I think I just needed to know that others agree with me. When I'm challenged, it makes me question myself if I am doing it right or am I just being petty.

Lisa

 

[powerhound]

Either get rid of them or make them solid. Those phantom lines are just too disruptive.

Powerhound, GDTP T-0419
Production Manager
Inventor 2009
Mastercam X3
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SSG, U.S. Army
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