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Ballons on Assembly drawings

Ballons on Assembly drawings

Ballons on Assembly drawings

(OP)


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

RE: Ballons on Assembly drawings

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)

RE: Ballons on Assembly drawings

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

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

RE: Ballons on Assembly drawings

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)

RE: Ballons on Assembly drawings

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

RE: Ballons on Assembly drawings

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

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

RE: Ballons on Assembly drawings

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)

RE: Ballons on Assembly drawings

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

RE: Ballons on Assembly drawings

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.

RE: Ballons on Assembly drawings

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

RE: Ballons on Assembly drawings

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.

RE: Ballons on Assembly drawings

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.

cheers
Helpful SW websites FAQ559-520
How to find answers ... FAQ559-1091

RE: Ballons on Assembly drawings

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

RE: Ballons on Assembly drawings

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

Tunalover

RE: Ballons on Assembly drawings

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

RE: Ballons on Assembly drawings

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

RE: Ballons on Assembly drawings

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.

RE: Ballons on Assembly drawings

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)

RE: Ballons on Assembly drawings

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?

RE: Ballons on Assembly drawings

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" smile products I use whatever the client wants.

cheers
Helpful SW websites FAQ559-520
How to find answers ... FAQ559-1091

RE: Ballons on Assembly drawings

From my experience:
bill of materials: Used by purchasing/machine departments to order materials.
parts list: A list that coincides with the assy dwg. (military designs use this)
A lot of companies do use them interchangeably.

Detailed assy dwgs usually has come from a company thet does not like creating a lot of dwgs, or just ignorant of the proper drafting/document specs.

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

RE: Ballons on Assembly drawings

As with CorBlimeyLimey, we give what the customer wants. Usually this is one set of drawings including GA,s sections and individually itemised parts, this seems pretty much the standard in tooling and special purpose machinery, which is our core business.

RE: Ballons on Assembly drawings

A detailed assembly is the one method I would never use  ... even if the client requested it. IMO, that is just plain wrong.

A BOM is just a Parts List with more information. I'm probably in the wrong, but I tend to use the terms interchangeably.

cheers
Helpful SW websites FAQ559-520
How to find answers ... FAQ559-1091

RE: Ballons on Assembly drawings

Of course customer requirements come first, the customer is always right after all.

I was just trying to work out why you'd have the sheet number as part of the balloon.

I can see it would mean something for a multi sheet detail assembly or even if you had a parts list, or separate parts list that was several pages long.  However on the majority of drawings I've seen it wouldn't make any sense.  Maybe I'm missing something.

To me the parts list is on the drawing, the BOM is in the MRP system or equivalent data source.  (plus to me it will always be an item list, that's the way the UK Def Stans did it which I learnt on)

RE: Ballons on Assembly drawings

Sorry, that should be the parts list will always be an item list.

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