I have done it both ways. Adding all mechanical parts to the Schematic, and 
not adding them.

Each has its' advantages, and disadvantages, as has already been pointed out.

The one 'part' that I seem to have issues with, is the actual PCB. I find that 
a bit of a stretch, adding it to the schematic - since it is the PCB that the 
schematic parts go on to, but I have found that management here wants to see 
the PCB on the BOM.

What I try to do is have the Schematic drive and control the BOM. But, I do 
not feed the Schematic's BOM directly into our MRP system. Instead, I use an 
intermediate program called Parts & Vendors that I Import the Schematic-
generated BOM into, where I can create a multi-level BOM. I then export that 
BOM to an Excel spreadsheet (why are we still using spreadsheets for BOMs?), 
and send that to the assembly folks who import that into the company-wids MRP 
system.

It may sound cumbersome, but it is actually very workable, and P&V allows me 
to do some preliminary 'what-ifs', and costing, if I want to.

I am thinking that William Brooks has hit upon a point that I have encountered 
once, and will again - and again, and that has to do with RoHS & REACH - as 
well as Conflict Materials.

We have had one client that wanted all of these researched for all of the 
parts and status displayed on the BOM for each of the above categories.

This is what will bog down a schematic-driven BOM real quick. For this reason, 
I don't think that the Schematic should contain ALL of the excessive data, but 
perhaps only enough information to get it into P&V, where the additional 
information can be stored in a database.

But... that's my opinion. That, and a 1.50 will get you a cup of coffee.

Great discussion, folks!

Regards,

James Jackson
Oztronics




Quoting "Brooks, William" <[log in to unmask]>:

> I like that the IPC is looking into this from a standards point of view...
> perhaps the CAD vendors will take their lead and adopt the industry
> standards... 
> Note: I must point out that RoHS and REACH and other regulatory agencies
> are requiring a paper trail be kept and companies need to tag their parts
> in the CAD library and thus in the BOM with their compliance with those
> specs... We flag our parts for their compliance in the MRP system and in
> our libraries. It's not as simple as it used to be... 
> 
> 
> 
> 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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