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 aren't the female checker some other poster was complaining about a few months (years?) back are you;-).

Most people didn't like me pointing out their mistakes either and I am of the male persuasion though fairly young and inexperienced (by checker standards). However, my immediate predecssor was retirement age and they didn't like him pointing stuff out either.

I think Engineers are worse than designers/drafter but I don't have a large enough sample size to say that with much confidence.

That said, the lead systems guy was over asking why everyone here is so resistant to doing tolerance checks, I told him I didn't know (although I shared a few theories) but that they were like that with me too when I was checking.

3 years is pretty good going though for this to be the first to question every redline;-).

Good luck, keep fighting the good fight.

KENAT,

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

http://eng-tips.com/market.cfm?

What is Engineering anyway: faq1088-1484

 

[lmdrafting]

That may have been me a year ago :->. I think it was about center marks on every hole on every view. Funny thing...the same guy that gave me a hardtime back then.....is now my manager.

Lisa

 

[cadman1964]

Well pep's I do all when it comes to Design. I Design the tool, detail the tool, check my prints (I know what you all going to say "you shouldn't check your own prints" But i have no choice due to recourses) up date checker prints, make a book & copy prints for tool build. I used to due lot more but they took my detailer away...

But back to OP. Our cad system is defaulted to show tangent lines, there visible lines not phantom lines. In the drawing i posted, which ISO would you prefer to see on a drawing if you building this part? (I removed the dimensions from the print) Remember also, ISO view are for clarification on complicated parts sometimes. We don't use ISO view's unless for clarification of the part.

Solid Edge V20

 

[PeterStock]

I would agree that for most orthographic views, the tangent lines do not add anything. The exceptions mostly being when there are no edges for a feature to show up. In an iso view (I usually show an iso or two for reference) I show the tangent lines a dimmed or phantom. For the part in lthurner's example, I would need to try it with and without for the iso view, the existing iso does look a bit busy.

The cad system I am most familiar with (Pro/E) gives the ability to show only selected tangent lines. I use this method to show features that would otherwise not show up clearly.

Peter Stockhausen
Senior Design Analyst (Checker)
Infotech Aerospace Services

http://www.infotechpr.net

 

[KENAT]

cadman, my favourite is #4. For this part I don't see that showing the tangent lines adds much, and certainly the hidden lines in #1 is just messy.

Agree with Peter that ortho views rarely benefit from tangent lines.

But that's just my 2C. Management types will like #4 most because it's prettier.;-)

KENAT,

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

http://eng-tips.com/market.cfm?

What is Engineering anyway: faq1088-1484

 

[ewh]

I have to agree with Peter on this issue. The thing to remember is that you want a clear, concise drawing. Unfortunately, not everyone sees the same thing when looking at a view containing smooth edges. Sometimes they are necessary to refine the part definition, sometimes they just add a lot of "noise" to the drawing. I think it would be a mistake to declare a blanket edict banning or requiring them. They should be used on a case-by-case basis.
I prefer #4, but would not reject #2 if the smooth edges were a thin weight.

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

 

[EdMcCabe]

The way I see it, back when I was making a drawing of a part in AutoCAD I didn't try to show tangency lines, why should I show them just because I can do so easily using Solidworks? I think it is a rare drawing that benefits from showing tangency lines. Just my 2 cents.

 

[ewh]

There are many different shapes to be defined. If you work with mainly blocks and cylinders, smooth edges are moot. If you work with complex, organic shapes, you simply cannot easily portray the required shape without using smooth edges. Of course, there is a huge gray area between the extremes, so YMMV.

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