I think the CAD tools are not being designed to work the way many people are required to work... Perhaps they are being designed to work the way that the programmers think they ought to work??? Most of us are flexible and work with it whatever way it works.... but is it the best way for us to work on a project as a project team? ?
Assemblers have to be very versatile to deal with the different ways designers and engineers deliver their data... Some contract assembly houses do turn-key assembly... you supply the BOM, and design files... they go purchase the parts, the bare board, and assemble to your data... right?
Think about how ridiculous it is to have to edit the electrical schematic and roll the rev every time someone needs to change a mechanical part... really?
In my estimation, the ideal system would allow the mechanical data to be input into an 'assembly' part of the CAD tool that placed the mechanical parts on the referenced board 3d model... and then handled multiple levels of the assembly, hand stuffed, automated assembly, referencing fixtures for soldering, or alignment of parts prior to soldering... All this with the ability to look at nested assemblies from the top assembly on down to the board sub-assemblies... all in one tool. This would be the device that controlled the Bill of Materials... and referenced cad data... and kept track of the revisions...
Some projects can get pretty complex, signal integrity thru multiple boards and cables to get to one module from another would be pretty cool to be able to model... on one system.
Just sayin...
I think then we could let the schematic be a schematic and the mechanical stuff would reside in a mechanical area of the design...
If only someone would invent it...
William Brooks, CID+
Senior MTS (Contract)
2747 Loker Ave West
Carlsbad, CA 92010-6603
760-930-7212
Fax: 760.918.8332
Mobile: 760.216.0170
E-mail: [log in to unmask]
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Brooks, William
Sent: Wednesday, June 26, 2013 2:26 PM
To: [log in to unmask]
Subject: Re: [DC] Questioning the trend to use the schematic diagram as a Bill of material generation source
Good discussion... It seems from your comments that others have experienced this 'phenomenon'... and found ways to accommodate the wishes of their customers, or management as the case may be...
I also have added mechanical and other non-electrical parts to the schematic on a 'junk' page to make them show up in the BOM for the board... sometimes they have footprints and sometimes they don't...
Examples of items that may or may not belong on the BOM that aren't electrical are things like fiducials, mounting holes, tooling holes, brackets, card ejectors, stiffeners, heat sinks, sil-pads, nylon washers and screws to isolate TO-220 transistors, some mounting terminals, clips for fuses, standoffs, spacers, etc...
William Brooks, CID+
Senior MTS (Contract)
2747 Loker Ave West
Carlsbad, CA 92010-6603
760-930-7212
Fax: 760.918.8332
Mobile: 760.216.0170
E-mail: [log in to unmask]
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