Part quantities on schematics or sub assemblies?
Part quantities on schematics or sub assemblies?
(OP)
Our company is making a change and I was wondering what other companies have done and some pros and cons to each way of doing this. Currently we quantify parts on the schematic BOM and also call them out on the installation or sub assembly BOM but give them a quantity of "0". For example a pump or a valve is currently quantified on the schematic BOM, but called out as an item in the installation BOM with a quantity of "0". We want to eliminate the "0" quantities and make "actual" quantities on the installation drawing BOMs and eliminate the call out on the schematic BOMs altogether. Do other companines quantify components on schematics or installations? If not on schematics, then how do you note the expected performance of a component on the schematic for design analysis and trouble shooting?





RE: Part quantities on schematics or sub assemblies?
Usually they are considered a "parts catalog" - something for the customer to use when ordering spares.
RE: Part quantities on schematics or sub assemblies?
Mike Halloran
Pembroke Pines, FL, USA
RE: Part quantities on schematics or sub assemblies?
Chris
SolidWorks/PDMWorks 08 2.0
AutoCAD 06/08
ctopher's home (updated 10-07-07)
RE: Part quantities on schematics or sub assemblies?
Not sure if ours is the best way, but yours definitely seems like it could be a pain.
KENAT, probably the least qualified checker you'll ever meet...
RE: Part quantities on schematics or sub assemblies?
Believe it if you need it or leave it if you dare. - Robert Hunter
RE: Part quantities on schematics or sub assemblies?
Mike Halloran
Pembroke Pines, FL, USA
RE: Part quantities on schematics or sub assemblies?
If so what MRP system, cause ours, at least the way we use it, don't accomplish anything near this.
KENAT, probably the least qualified checker you'll ever meet...
RE: Part quantities on schematics or sub assemblies?
It ran on an AS/400, and may have been slightly customized for us, but I had the impression that it was basically a commercial product. Unfortunately, I don't know who sold it or what it was called. I'm pretty sure it's been replaced with something graphical, and slower. It was state of the art, 20 years ago.
I thought all the AS/400s had been discarded as junk a decade ago, but at my new job, we have one that is treated with great reverence, for reasons that elude me. The software we're using was apparently patched and adapted from some old POS software
( I mean that both ways, one much more strongly. I don't think I have ever seen an uglier or more bug-ridden kluge anywhere, and I have used and written a lot of ugly kluges. )
Mike Halloran
Pembroke Pines, FL, USA
RE: Part quantities on schematics or sub assemblies?
Given that our CAD will automatically change the item number depending how you sort the parts list/as you add or delete items I don't see how our MRP could easily keep up, especially as we have no PDM/PLM or real config control discipline.
KENAT, probably the least qualified checker you'll ever meet...
RE: Part quantities on schematics or sub assemblies?
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group
RE: Part quantities on schematics or sub assemblies?
Are you saying that none of the drawings have BOMs?
We order parts directly from the drawings so what ever is on the BOM goes into our purchasing system. This is the reason that we would call out parts on all drawings with references, or "0" quantities on some drawings, and hard quantities on another.
Mintjulep's system seems to call out items on the schematic BOMs, but these are not fed into the purchasing system for order. That wouldn't work for our system since every drawing goes into our purchasing system.
Kenat's system seems to be similar to Mintjulep's but when you say "just has the components names/part numbers" do you mean in note form or what?
Our system may be closer to MikeHolloran's except that our drawing's have BOMs and they get fed into the purchasing system exactly as entered.
Thanks for all of the comments, more comments are appreciated. If I'm hearing everyone correctly, it sounds like we are making a smart move to quantify materials on only one drawing.
RE: Part quantities on schematics or sub assemblies?
I'm not sure if we're really standardized on how it's done. Just looked at one and all the cables just have PN with the designator/identifier (e.g. for the connectors J1, J2, J3 etc)at each end and in some cases the name (or part of it) is given at one end next to the designator. Most of the parts being connected only have their name/description not PN.
However, I wouldn't necessarily follow this exact method as best practice. Drawings were a mess when I first started here a couple of years ago and we haven't yet addressed all areas, cable schematics being low on the list.
Just realized, you're talking about 'installations'. We build actual machines and have more or less complete drawings of all assemblys (at least in theory) so what I put may not directly apply to your situation.
KENAT, probably the least qualified checker you'll ever meet...
RE: Part quantities on schematics or sub assemblies?
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group