【转帖】ballons on assembly drawings

yang686526

ballons on assembly drawings
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
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
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.
same here wes. i think most do not understand it.
chris
systems analyst, i.s.
solidworks 06 4.1/pdmworks 06
autocad 06
we use single balloons for item callouts, split balloons for datum points.
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.
what??!!! you traitor!
(just kidding)
chris
systems analyst, i.s.
solidworks 06 4.1/pdmworks 06
autocad 06
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.
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.
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
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.