Ballons on Assembly drawings 1

[TimSr]

I am looking for the standard practice on how to address balloon formats? There seems to be two camps, split ballons - the top is the item number and the bottom is the quantity vs a single ballon with the quantity(2x)next to the ballon but outside. Can anyone confirm whether there is a standard? Are there any specifications that talk about it? This is my first time on this web site. Thanks for all your help

Tim

 

[ctopher]

You can do either.
ENGINEERING DRAWINGS (ASME-Y14.100, ASME-Y14.24, ASME-Y14.35M, AND ASME-Y14.34M)
The balloon with 2X next to it is common.

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)

 

[wes616]

Personally, i like the single baloon better for "visual quality." But alas, my company doesn't see it the same way.

Wes C.
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Light travels faster than sound. That's why some people appear bright until you hear them speak.

 

[ctopher]

Same here Wes. I think most do not understand it.

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)

 

[ewh]

We use single balloons for item callouts, split balloons for datum points.

 

[wes616]

My personal preference, though, is to do away with baloons all together and to hard callout the item on the f/d.



Wes C.
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Light travels faster than sound. That's why some people appear bright until you hear them speak.

 

[ctopher]

What??!!! You traitor!
(just kidding)

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)

 

[wes616]

Well let me say that I prefer it in the environment that I work in, for most of the dwgs that i make.

Wes C.
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Light travels faster than sound. That's why some people appear bright until you hear them speak.

 

[KENAT]

Again a preference but:

Single ballon with qty next to it only if really needed for clarity.

Generally I don't have a qty by the balloon. I just rely on the item count in the parts list.

Our checker thoroghly researched this a while back and this is what came up as favorit.

 

[Tunalover]

wes616-
The disadvantage (and it's a big one) to calling parts out right in the field of the drawing (without balloons) is that you can never make a change to the assy by changing just the BOM (and A-size drawing that's easy to change).


Tunalover

 

[ajack1]

We do one of two things, on a set of drawings that total less than five we just give the part #, on over five we split the balloon with part # on top and sheet # below, it is very time consuming for the poor guys on the shop floor to wade through say fifty sheets of drawings to find which one item # 87 is detailed on.

Quantity is only ever shown in the BOM. Not sure if that is true to any standard but it is what the customers want and seems sensible to me.

 

[CorBlimeyLimey]

ajack1 ... Are your part numbers and drawing numbers not the same? It usually makes life much simpler if they are.

The Item Number is normally just a cross-ref to the part (and it's Part Number) in the BOM. The Part/Drawing Number is then used.

Having said that, the first company I worked for (pre-CAD) used a split ballon ... top half for the Item Number, bottom half for the Sheet Number it was detailed on.

​

Helpful SW websites faq559-520​

How to find answers ... faq559-1091​

SW2006-SP5 Basic ... No PDM​

 

[wes616]

Tuna,

Technically speaking, if you change the BOM, you would do so by cancelling a find number and replacing it with a new one, so one might say you'd need to go through the drawing anyway.

Like if I decided to replace

NAS517-3-( ) screw with

NAS8603-( ) screw,

I wouldn't just Sub the new part in for the old part, giving it the same find number. I would replace the NAS517 with REMOVED and give the NAS8603 a new find number that hans't been used yet.

just more thoughts...

Wes C.
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Light travels faster than sound. That's why some people appear bright until you hear them speak.

 

[Tunalover]

wes616-
Why would you cancel a find number and replace it with a new one? I'm perplexed by the need for that.


Tunalover

 

[wes616]

Well tuna,

I learned something today. At my last 2 employers, we had a policy that once a find number was used in assy, it became uniquily associated with that part. Therefore on a change order or a revision, the item number would be filled in with the word "removed" and the new part would be placed further down the list.

Well I jsut assumed that this was standard, but I am wrong. After looking it up, i suppose that I am in a unique situation here (as well as with my last company). Go figure!

Thanks, tuna, for setting me straight!



Wes C.
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Light travels faster than sound. That's why some people appear bright until you hear them speak.

 

[wes616]

The boeing design manual even states that find number should be used for the purpose of not needing to change the drawing when you change the part list.

Next time i will check before i A$$ume!

Wes C.
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Light travels faster than sound. That's why some people appear bright until you hear them speak.

 

[KENAT]

So I'm starting to get confused. Are some of you guys doing detailed assemblies?

i.e. the piece parts are detailed as part of the assembly drawings.

 

[ctopher]

Each part has its own drawing. Each assembly has its own drawing.

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 06-21-06)

 

[KENAT]

Ctopher, that's how I was taught to do it and how I prefer to do it and how the ASME standards prefer to see it done (I can't remember the wording but it basically discourages detail assemblies except for one offs etc).

It was Ajack1 & Corlimeys posts that got me wondering.

They've done a couple of detail assemblies here where I work and I can't stand them, I'm sure other people make them work and maybe they're great in certain applications, maybe tooling fixtures etc but all the ones I've seen here end up causing problems.

Also while I'm at it. Is everyone else using the terms 'bill of materials' and 'parts list' interchangeably?

 

[CorBlimeyLimey]

There are several methods allowed by SW;

1) One single drawing sheet for each part or assy.
2) A multi-sheet drawing for all assemblies and parts.
3) A multi-sheet drawing for all assemblies and a separate multi-sheet drawing for all parts.

You choose whichever one best suits your industry & company.

For in-house products I use method 3.
For "out-house" products I use whatever the client wants.

​

Helpful SW websites faq559-520​

How to find answers ... faq559-1091​

SW2006-SP5 Basic ... No PDM​