Assembly Drawing theoretical question

[T105]

Hello,

I've considered to ask this question in CATIA forum, but I think it is more related to general mechanical engineering topics.

We've been working on an assembly drawing with a number of parts inside. In one of the sheets, I want to show some detail, but in order to do this I have to hide some of the parts in the assembly.

I cannot remember a rule about this and I also cannot remember any examples. So can we do this in an assembly drawing?

One solution may be to put a note explaining the hiding of the parts with their BOM item numbers.

Anyway, I would be happy for any help.

Best regards

 

[dgallup]

I usually do a cross section, sometimes I'll turn an outside component to "phantom transparent" display which shows the outline of the outside in phantom lines while showing all the interior parts.

 

[EngineerTex]

Directly below each view, you need to state the name of the view. This was true, even when we were drafting by hand.

In the same vein as:
"TOP"
"RIGHT SIDE"
"FRONT ISO VIEW"
"SECTION A-A"
"VIEW D-D ROTATED 45 DEG"

You would state:
"VIEW E-E
OTHER PARTS NOT SHOWN FOR CLARITY"

Or:
"FRONT VIEW SUBASSEMBLY 1"
And then call out SUBASSEMBLY 1 in your BOM on another page wherever it is inserted into the part.

And I would imagine that there are other ways of doing this as well.


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[T105]

Thank you very much for the help. The note with the "clarity" explanation is a good way of doing that. Though the subassembly approach might be problem because of the PLM software managing the BOM.

 

[drawoh]

T105,

The written standards cannot cover everything. A note attached to your drawing view can explain that you hid some parts.

I am a SolidWorks guy and have no experience with CATIA. In SolidWorks, I would never manually type an item number into a note. There are all sorts of ways an item number can change.

Make your part descriptions consistent and logical.

JHG

 

[KENAT]

Not sure about naming of all views being mandatory (Don't see this requirement in ASME Y14.3 for projected views), however, the idea of labeling a specific view and saying "... NOT SHOWN FOR CLARITY" is one I use a lot where a section view doesn't quite 'cut it' (excuse the pun).

It's sometimes nice to use item numbers to say which part isn't shown but as drawoh points out, some CAD can auto number balloons and numbers change accordingly which can cause problems.

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[ewh]

First, forum1103 is the probably the best place to post this question, as it has to do with drawing standards (though that is no guarantee of finding agreement;-)).

I also use the "... NOT SHOWN FOR CLARITY" method, though I question the need for standard view identification if the projections are obvious. If more than one section view is present, then the section views should all probably be named.

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