【转帖】y14.100 question - next assyused on

yang686526

y14.100 question - next assy/used on
i'm not really clear on how to use the "next assy" and "used on" blocks on a drawing. the y14.100 explanation of application data in section 4.6 confuses me.
so for the next assembly column, i should list, bottom up, all of the nested assemblies this part goes into? if that's the case, i have no idea what "used on" should be used for.
thanks in advance for clarification.
-matt
next assembly is whats "above" the drawing in question. as a simple example, a drawing of a screw would use the drawing number that shows where the screw is put together as the next assembly.
used on is the "system" and it is up to you or your company. as an example, a first tier supplier of aircraft parts might choose to use things like, f-18, 737, or airbus a380 as the "used on"
agreed, it means "above" to me too, but some companies use next higher assy" or nha to eliminate confusion. more and more companies don't use these fields at all on drawings anymore. they prefer to cover it in indentured bom's that are program specific.
i used to think "used on" was a good idea.  as long as the list is not consodered to be comprehensive.  that could make for a lot of changes on drawings for parts that are used in many places.
otherwise, that's what bpics is for.
we just got rid of the used on part on all drawings.
i may be wrong but i think it's something of a throw back to pencil drawings like places that put the drawing size in the drawing number somewhere.  it was very usefull at one time but is more trouble then good now that everything is stored and tracked electronically.
we just use a pdm system that keeps track of everything.  i can use a part as many times as i want without needing to do anything to the drawing.
thetick,
   i created a title block with a box titled "designed for".  i figured this explicitly required one higher level assembly only.
   i can tell you now that some people work very hard to get confused.  i removed the box.  
                      jhg
i have used "used on" or "model number", model number it is used on.
"next assy", for the next assy it is used in.
all companies i have worked for, it has never been an issue, or has been ignored.
chris
solidworks 07 4.0/pdmworks 07
autocad 06
we use the "used on & model number" but that only because our mrp system is lame.  but i agree with thetick....it creates a nightmare for doing revisions or part changes.
heckler   
sr. mechanical engineer
swx 2007 sp 4.0 & pro/e 2001
      o
  _`\(,_
(_)/ (_)
this post contains no political overtones or undertones for that matter and in no way represents the poster's political agenda.
i agree, it can be a nightmare. if one part is used on 1,000 models, the revisions will go on forever!
chris
solidworks 07 4.0/pdmworks 07
autocad 06
revisions are what keep us drafters in business!
david
at my company, our plm maintains both bom and where-used (now the more come term for "next assy").  we list neither boms or next assy on our drawings.
matt
cad engineer/ecn analyst
silicon valley, ca