Is it possible to use Isometric or Trimetric drawing views on a pure A
Is it possible to use Isometric or Trimetric drawing views on a pure A
(OP)
Is it possible to use Isometric or Trimetric drawing views on a pure ASME 14.5M drawing package? On ASME Y14.3 Page 5 Fig 4 defines what a Third Angle Projected view. On this illustration there is an Isometric view. Throughout the ASME standard series there are Isometric views everywhere. I would like to revisit the subject of Isometric or Trimetric views on drawings per the ASME Y14.3 standard. (thread1103-157995: Is dimensioning/detailing in isometric view acceptable??) What standard or words prevent us from using these types of views?
Are there restrictions on Isometric and Trimetric views?
What standard says we can not use Balloons or Weld symbols on Isometric Views?
Why have the purest checkers not adopted these types of views.
Why is everyone so reluctant to using these types of views. I know this issue has be debated for about 15 years.
Any comments?
Dan
Siemens Energy & Automation Inc.
Infrastructure Logistics Division
1401 Nolan Ryan Expressway
Arlington, TX 76005-1080, USA
Are there restrictions on Isometric and Trimetric views?
What standard says we can not use Balloons or Weld symbols on Isometric Views?
Why have the purest checkers not adopted these types of views.
Why is everyone so reluctant to using these types of views. I know this issue has be debated for about 15 years.
Any comments?
Dan
Siemens Energy & Automation Inc.
Infrastructure Logistics Division
1401 Nolan Ryan Expressway
Arlington, TX 76005-1080, USA





RE: Is it possible to use Isometric or Trimetric drawing views on a pure A
This allows the use of other than orthographic projections on a drawing. Per para 3.3.2(a) "A complete definition of a product shall contain a model and a drawing that may contain orthographic views, axometric views, or a combination thereof. Annotation may be applied to the model, or on the drawing, or a combination thereof."
This lets us do as we wish in regard to what views to include on the drawing.
Believe it if you need it or leave it if you dare. - Robert Hunter
RE: Is it possible to use Isometric or Trimetric drawing views on a pure A
(g) Dimensions should be arranged to provide required
information for optimum readability. Dimensions
should be shown in true profile views and refer
to visible outlines.
I would interpret that to say that as long as the feature is shown true size and shape, you can dimension it per ASME Y14.5M-1994. The problem with Isometric or trimetric views is that most of your features are not shown TS&S.
However, like ewh said, you can always callout ASME Y14.41 and then isometric dimensioning is allowed (as long as it follows the rules, many CAD systems do not support Y14.41 yet).
David
RE: Is it possible to use Isometric or Trimetric drawing views on a pure A
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RE: Is it possible to use Isometric or Trimetric drawing views on a pure A
Another part of the problem with dimensioning to isometric views is that it can quickly get confusing as to which dimensions relate to each other, as features can often be dimensioned several different ways simultaneously.
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group
RE: Is it possible to use Isometric or Trimetric drawing views on a pure A
However if working to 14.5 not invoking 14.41 then I'd probably side with Aardvarkdw on 1.4(g), wish I'd noticed it when I brought up the question originally. To me a profile view would be a true view on one 'side', not an iso or similar view.
Of course it says should not must so, iso's are technically fair game unless anyone knows another reference.
As to balloons etc, it doesn't really forbid them as it talks about dimensions.
However, in an iso view it's sometimes difficult to tell exactly where things line up etc so in this case orthogonal views may still be clearer.
Why don’t checkers like them, well apart from the above, which is perhaps ammunition enough, there’s the factor that many checkers probably learnt to draw on the board, or at least 2D CAD. Even then, my old checker said he’d used them on piping.
Reluctance to use them, well the above partly covers it. My biggest thing is that the drawing must be unambiguous. Sometimes iso etc views can be misleading, including on assemblies.
Not explicitly in your post but as regards exploded views, my problem with these, at least as the only views, is that they don’t actually explicitly show where the items actually end up. To my understanding this contravenes ASME Y14.24-1999 4.1.3 (d) “depiction of the items in the assembly relationship…”
So in summary, even though I started out on 3D CAD, I prefer the classic orthogonal views most of the time.
KENAT, probably the least qualified checker you'll ever meet...
RE: Is it possible to use Isometric or Trimetric drawing views on a pure A
In my present place we do our Pro/E draft files in orthographic and aux projections with one or two ISO pictorials added on complicated parts for clarity, but do not dimension to them. On some assemblies, we will show that ISO exploded for clarity, but it will not be the main view.
We reserve the use of ASME Y14.41 only for our MBD drawings/models.
RE: Is it possible to use Isometric or Trimetric drawing views on a pure A
Dan
RE: Is it possible to use Isometric or Trimetric drawing views on a pure A
Yes
ASME Y14.41 allows this. So if you invoke it then yes.
Even without invoking 14.41 you can still use them but there are some restrictions.
You asked if there were restrictions on Iso views, hence all the stuff in the replies about not dimensioning to them.
I do not know of a standard which say's you can't balloon to them. However as I mentioned above in practice ortho views may often be more clear. I had an instance of this just this morning.
KENAT, probably the least qualified checker you'll ever meet...
RE: Is it possible to use Isometric or Trimetric drawing views on a pure A
Believe it if you need it or leave it if you dare. - Robert Hunter
RE: Is it possible to use Isometric or Trimetric drawing views on a pure A
"I am abiding by the AMSE standards can I use Isometric and Trimetric views?"
What do you mean by ASME (I am assuming that is what you meant to type) standards? Most people on here will assume that by saying "ASME Standard", you mean the drafting standard ASME Y14.5M-1994, but ASME publishes MANY standards. The ones that most apply to drawings are the Y14 series. Within this series is ASME Y14.4M Pictorial Drawing, which explicitly defines how isometric and trimetric views should be made and applied to a drawing. This standard references ASME Y14.5M-1994.
The answer to your question, as written,is yes.
David
RE: Is it possible to use Isometric or Trimetric drawing views on a pure A
Just prompted me to look at 14.100-2004, which is pretty much the top level ASME drawing standard.
At paragraph 4.10 Isometric and Pictorial Views it says:
So it all comes back to clarity, as I implied before. However, this can perhaps be subjective.
KENAT, probably the least qualified checker you'll ever meet...
RE: Is it possible to use Isometric or Trimetric drawing views on a pure A
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Well soon be in possession of ASME Y14.100-2004.
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group