Breaking apart a Cots part 1

[marshell]

I have a COTS (VICD) part that will have the pieces of the part used in different models/drawings. The COTS part consist of 2 weld on flanges, and a clamp that pulls the flanges together. Flange A will be welded onto weldment A, Flange B will be welded onto weldment B, and there will be a higher assembly that uses the clamp to pull them together.

I am trying to figure out how to structure these without breaking MRP.

My first thought is to create a VICD for the purchased part, and then an Altered item drawing that breaks it into 3 individual part numbers that can be called out on the VICD/Assembly. The concern I have is that purchasing will end up ordering 3X the required COTS parts due to MRP driving requirements. I am not sure how well it would fly if the altered item drawing listed a Qty of 1/3 for each part.

Has anyone else dealt with a similar situation, and how was it handled?

Thank you.

 

[jassco]

Just focus on what you need.

If you need to purchase an item, you create a print for this item as a "purchase" item.

If you need to put together multiple items, you create a print for this combined item as a "make" item.

Best regards,

Alex

 

[marshell]

Maybe I did not explain well enough. I have a "purchase" part that has 3 pieces to it. Each of those 3 pieces will be used in 3 different parts/assembles.

 

[3DDave]

The problem that this poses is that you are buying the vendor item and making it disappear. It becomes a negative item to the MRP system; that is, if someone does an inventory of that item it won't be anywhere in the factory or delivered to the customer. I doubt that there is an MRP module that has that as a function.

A company I worked for did this sort of thing and they just manually added text items to the MRP BOM.

 

[ctopher]

Make a new assembly P/N and drawing for the COTS part. Make each piece a dash no.
Call out each dash no on associated assy's.

 

[jassco]

Hi, marshell:

No ERP will allow that. You are trying to make a new item out of a fraction (1/3?) of the purchase item. You won't be able to do backflush with the component. You will need to adjust it manually.

Best regards,
Alex

 

[Nescius]

Apologies if my spitballing ends up as only a distraction; MRP issues are one of my least favorite things about engineering and I devote about as much time to their study as you'd expect.

That said, I might try to squint my eyes and imagine the purchased item as a sort of raw material.

A single unit of purchased "raw material" yields 3 new items upon processing. Consider an inventory of metal ingots and the case where a casting pattern produces multiple unique parts in a single mold.

So, you wouldn't include the COTS assembly, or any fraction thereof, in your weldment BOM, just as you wouldn't include any notion of an ingot in the BOM for an assembly containing one of my hypothetical castings.

 

[MintJulep]

My first thought is to create a VICD for the purchased part, and then an Altered item drawing that breaks it into 3 individual part numbers that can be called out on the VICD/Assembly.

That sounds like exactly the right way to do it.

 

[jassco]

Hi, Nescius:

"A single unit of purchased raw material" below is not an item.

"A single unit of purchased "raw material" yields 3 new items upon processing."

Unit of measure for materials in ERP is either lb. or Kg. Therefore, it can have fractional Qty. When you purchase an item with unit of "EA" (each), you can't have a fractional Qty.

Happy New Year!

Alex

 

[drawoh]

I have a COTS (VICD) part that will have the pieces of the part used in different models/drawings. The COTS part consist of 2 weld on flanges, and a clamp that pulls the flanges together. Flange A will be welded onto weldment A, Flange B will be welded onto weldment B, and there will be a higher assembly that uses the clamp to pull them together.

I am trying to figure out how to structure these without breaking MRP.

My first thought is to create a VICD for the purchased part, and then an Altered item drawing that breaks it into 3 individual part numbers that can be called out on the VICD/Assembly. The concern I have is that purchasing will end up ordering 3X the required COTS parts due to MRP driving requirements. I am not sure how well it would fly if the altered item drawing listed a Qty of 1/3 for each part.

Has anyone else dealt with a similar situation, and how was it handled?

Thank you.

I model the part as an assembly. I attach a specification control drawing to the assembly which provides the manufacturer and part number. Assume the specification control as the number AB1234. I attach a BOM to the specification control. I apply tabulated part numbers to the pieces of the assembly, i.e., AB1234-001, AB1234-002, etc.

The pieces are called up on other assemlys by the part numbers we have assigned, i.e., AB1234-001, AB1234-002, etc. The number AB1234 points to a specification control with a manufacturer and part number. MRP orders the assembly. Someone must take it apart and stock the individual pieces.

 

[ctopher]

drawoh, we do similar.