Jesse, Do you have anyone to help you proof the BOM? For some projects, we conduct at least a dozen reviews. Review the schematic when it's "done", review the layout when it's "done", review the BOM.. we discover lots of mistakes this way. Not to say that some of them still make it to production, but this "buddy system" definitely cuts down on the number of prototypes we have to go through, and the severity of mistakes. We used to check the "handcrafted" BOM against the EAGLE-generated BOM. It's fastest when you have two people w/ highlighters, one calling out the part names and the corresponding value/package/etc and one verifying. When you're done, you should have all the line items highlighted. Vitaliy ----- Original Message ----- From: "Jesse Lackey" To: "Microcontroller discussion list - Public." Sent: Wednesday, June 02, 2010 14:42 Subject: Re: [EE] BOM management and contract manufacturing > Having not used Olin's system, and instead still making it by hand in > Excel, I can say with certainty to use Olin's system. By hand is > tedious at best and often error-prone, including recently forgetting to > fix a mistake in the BOM (a 0.1uF and 22pF caps were switched) in a qty > 1000 manufacturing run. I caught it after about 1/2 the boards were > made, my contact at the CM literally jogged into the production area and > stopped the pick&place and changed the programming mid-panel. I had to > swap them with a hot-air gun, pretty fast but there were ~500 to do... > > So invest a bit of time up-front in this if you (the OP) use Eagle. > > J > > > > Olin Lathrop wrote: >> Vitaliy wrote: >>> By the way, we recently >>> automated the process of creating the BOM using component attributes >>> (this is based on Olin's suggestion -- a big thank you!). >> >> In case others are interested too, this system uses Eagle attributes and >> includes ULPs and host programs to automatically generate a Excel >> spreadsheet from the information. This is all available for free in the >> Eagle Tools release at http://www.embedinc.com/pic/dload.htm. After >> installation, look at the EAGLE_BOM documentation file in the DOC >> directory >> and follow the cookie crumbs from there. >> >> This system is getting better and better for us as more library parts get >> touched. Of course new parts added to the libraries are now made with >> the >> BOM information up front. If used properly, pretty much the whole BOM >> except for the price column can be generated automatically. This used to >> be >> a much more tedius process. I still find a few parts every design that >> don't have the attributes, but BOM generation is down to a few 10s of >> minutes instead of hours now. >> >> >> ******************************************************************** >> Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products >> (978) 742-9014. Gold level PIC consultants since 2000. > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist