We do the exact same thing here as Larry's shop does. I wouldn't call it 2
BOMs, there is a subassembly level BOM of SMT parts only, which actually
includes all parts from the machine inserted TH processes, which is included
on a next level BOM for any had assembled parts, which are typically
connectors, radial caps, transformers. We build a few hundred through the
intermediate level, place into a kanban supermarket, then finish whatever
quantity we need for customer demand.
Blair
On Tue, 30 Nov 2010 07:51:35 -0800, Davis, Larry <[log in to unmask]>
wrote:
>Hi Rick,
>Yes, we use a 2 BOM system for all mixed technology boards. The main
>reason is so we can have an intermediate kanban for the SMT level only.
>This helps us balance the SMT line load more evenly due to run and
>changeover time variation, and allows for much smaller through hole
>runs. It also comes in handy when you have to scrap boards during the
>SMT run without having to manually "return" the through hole parts that
>weren't used. I have worked for 4 different OEM's and they all used
>this approach for the same reasons.
>
>Cheers,
>Larry
>
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Smith, Rick
>Sent: Tuesday, November 30, 2010 8:30 AM
>To: [log in to unmask]
>Subject: [TN] Separate BOM's for Same Assembly
>
>Hi Folks,
>
>Engineering currently produces two separate BOM's for a single board
>assembly, 1 for SMD's and the other for PTH parts which are subsequently
>entered into the ERP system by Doc Control. Without going into a lot of
>detail I understand the reasons for the separate BOM's are related to
>production logistics, routings and cost.
>
>I am told this is typical in the industry for OEM's and would like to
>either corroborate or debunk this with your responses. I am trying to
>determine if the 2 BOM system is necessitated by ERP limitations or the
>result of a misguided approach to process development.
>
>Does anyone use the two BOM approach for a single board assembly?
>
>Thanks!
>
>Regards,
>Rick
>
>
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