RE: [plcs-dex] Questions regarding Next_assembly_usage

["Barker, Sean \(UK\)" <Sean.Barker@baesystems.com>]

In aerospace, the distinction between part and assembly was not so strong. Indeed, in redesigning some parts, a fabricated assembly could be replaced by a single machined part, and carbon composite structures were a single part made from an assembly.

Sean Barker
0117 302 8184
 

> -----Original Message-----
> From: David Price [mailto:david.price@eurostep.com] 
> Sent: 31 March 2007 12:38
> To: plcs-dex@lists.oasis-open.org
> Cc: Peter Bergström
> Subject: Re: [plcs-dex] Questions regarding Next_assembly_usage
> 
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> Hmmm....  we may be talking about different things. R1 on a 
> circuit board, as I understand it, is a logical thing - not a 
> physical thing. That R1 identifier was created in the ee 
> logic design system long before things got physical. At least 
> that's my recollection, although this was many years ago.
> 
> Either way, left from wheel or R1 are not a parts in an 
> assembly. "Part" has a special meaning - or at least did in 
> IBM and similar mfg orgs - of being the smallest physical 
> component in a design. Of course, some of IBM's Parts were 
> other people's assemblies but in no case was Part used to 
> define a logical/functional item.
> 
> Hope this is helping,
> DP
> 
> On Saturday 31 March 2007 09:43, Peter Bergström wrote:
> > In a breakdown (although for this particular example I should use a 
> > physical breakdown, not a functional) you would instantiate 
> different 
> > breakdown_elements for the different locations, but I don't 
> think it 
> > is the same as to say that it's the left or right wheel in 
> an assembly 
> > of a car, or that an electronic component should be place in a 
> > specific place (named
> > location) on a circuit board. In the latter we are actually talking 
> > about parts in a parts assembly, where we have a 
> requirement for how 
> > or where the assembly is done.
> >
> > You could do the same with a breakdown structure, but there you are 
> > not really talking about designed parts directly - you 
> would have to 
> > realize the breakdown elements into parts to achieve the same.
> >
> > In some cases that is desired, e.g. early design and 
> in-support, but 
> > for the detailed design phase it is necessary to be able to talk of 
> > the location of a part in context of its upper level part 
> in a parts 
> > assembly, as well. At least, that is my understanding...
> >
> > Peter
> >
> >
> > -----Original Message-----
> > From: David Price [mailto:david.price@eurostep.com]
> > Sent: den 31 mars 2007 01:50
> > To: plcs-dex@lists.oasis-open.org
> > Subject: Re: [plcs-dex] Questions regarding Next_assembly_usage
> >
> > On Friday 30 March 2007 19:48, Peter Bergström wrote:
> > > Regarding location_indicator:
> > > If this is just a hangover, what in PLCS is replacing it?
> >
> > I assumed a functional breakdowns covered this requirement. 
> Is that wrong?
> >
> > Cheers,
> > David
> >
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