Help Engineers understand the differences between Bill of Materials and Routers

A

auclairdiana

#1
I am working in a start up medical device company that has begun moving from an R & D environment to manufacturing and I'm struggling with a way to help engineers understand the difference between an engineering BOM, manufacturing BOM and a router. We do not have any type of BOM in place at the moment and are trying to develop.

Any suggestions?

Many thanks!
 
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Jim Wynne

Staff member
Admin
#2
Re: Bill of Materials and Routers

I am working in a start up medical device company that has begun moving from an R & D environment to manufacturing and I'm struggling with a way to help engineers understand the difference between an engineering BOM, manufacturing BOM and a router. We do not have any type of BOM in place at the moment and are trying to develop.

Any suggestions?

Many thanks!
The best solution, if the amount of work permits it, is to have an experienced manufacturing engineer in the house. Trying to teach this type of thing to electrical and mechanical engineers can be a daunting project.

in any event, you won't get anywhere until you construct some kind of sample BOM at the appropriate level of complexity. What you're referring to as an "engineering BOM" is commonly known as an "indented BOM"; it shows the completely hierarchy of component assemblies down to piece-parts. A "manufacturing" BOM, if I understand your usage correctly, is a "collapsed" indented BOM, meaning that it shows only the component assembly levels and not the piece-parts of each assembly. A router, on the other hand, usually just shows the manufacturing sequence, but can become more elaborate showing such things as tooling and gaging used at each step.

If you can't hire a manufacturing engineer (even on a consulting basis), the best thing to do would be to get everyone together and construct an example BOM.
 

RCW

Quite Involved in Discussions
#3
Re: Bill of Materials and Routers

I have to plead ignorance on the difference between an Engineering BOM and a Manufacturing BOM but here goes on the other difference.

A BOM is a list of components required to manufacture a product. A router on the other hand controls the manufacturing process, guiding the process through each step and allowing an operator to sign off when a step is completed.

I've never seen it done but I would suppose a BOM could be included as part of the router how ever you back yourself into a corner with regards to design changes and revision control.

Did you need more detail than this?
 
B

Bogie

#4
Re: Bill of Materials and Routers

Very simplistically, in my company:

An Engineering BOM is a BOM that is not released for production/manufacturing (for experimental or developmental purposes only)

A Manufacturing BOM is a BOM to build sellable product.

A Router is a list of steps/departments, in order from start to finish, that the assembly goes thru to make product.

Of course it gets more detailed once the folks understand these basics, but that is what it boils down to.

Hope this is helpful for your industry.
 
A

auclairdiana

#5
Re: Bill of Materials and Routers

My understanding of the differences between a manufacturing BOM and an engineering BOM is the manufacturing BOM will contain all components required to build the final product and an engineering BOM represents only the physical product being engineered, not the packaging or manufacturing consumables. Since we've never had either type of BOM, I've been asked to train the engineers on how to create a manufacturing BOM and router.
 
A

auclairdiana

#6
Re: Bill of Materials and Routers

RCW and Bogie: Thanks so much for clarification on the BOM and router. Now I just have to find a way to convey this to our engineers...
 

RCW

Quite Involved in Discussions
#7
Re: Bill of Materials and Routers

Since we've never had either type of BOM, I've been asked to train the engineers on how to create a manufacturing BOM and router.
A few words of advice, get your manufacturing people involved in the development of the routers. You want the people who know how to do the actually manufacturing giving their input to the process. This is a recommendation from personal experiece (Don't let the guy who doesn't know which end of the soldering iron to pick up mandate the process!)
 
J

JaxQC

#9
Side note on BOMs relating to this is BOM vs. “shop supplies”. One bad habit I often see & have to correct is sticking things in the shop supplies category (misc budget & not in BOM) rather than in the actual BOM for the part.
ie.. cup of oil in every gear box, 2 lbs foam packing, 15” tape each box, plastic pouch on each box to hold bill of lading etc.

The determining factor should be the question “Do I expect this to be with every single product?” If so, it’s a BOM item and cost is tied back to that product. Otherwise

If it’s low volume and your profit margin is high enough you might not really care. Higher volume and having a more exact picture of your true costs not to mention not having a high misc $$$ group at the end of the year that you don’t know where it came from is better.

Teach them correctly right from the beginning.
 

Jim Wynne

Staff member
Admin
#10
Side note on BOMs relating to this is BOM vs. “shop supplies”. One bad habit I often see & have to correct is sticking things in the shop supplies category (misc budget & not in BOM) rather than in the actual BOM for the part.
ie.. cup of oil in every gear box, 2 lbs foam packing, 15” tape each box, plastic pouch on each box to hold bill of lading etc.

The determining factor should be the question “Do I expect this to be with every single product?” If so, it’s a BOM item and cost is tied back to that product. Otherwise

If it’s low volume and your profit margin is high enough you might not really care. Higher volume and having a more exact picture of your true costs not to mention not having a high misc $$$ group at the end of the year that you don’t know where it came from is better.

Teach them correctly right from the beginning.
Good point. :agree1: In addition to other functions, BOMs are used as the basis for determining whether or not a thing can be made/manufactured based on availability of materials. In general, if a tangible item is necessary to the final product it should be accounted for in the BOM.
 
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