Bill of Materials for Manufacturers

Each part has a material list and a stage sequence held against its drawing revision. The store issues from that list and the floor works through those stages.

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What the material list holds

The list answers one question. What must the store issue for one piece of this part at this revision, and what arrives ready-made from a supplier?

Material and grade

Bar, sheet, casting, resin or ingredient with its grade, section size and the quantity one piece consumes. Weight per piece can be held too.

Bought-out items

Bearings, fasteners, motors, seals, labels and cartons that come in ready and go into the part or its packing.

Scrap and process allowance

The extra material a cutting, machining or filling stage takes, so the issue quantity for a batch is not short on the shop floor.

Consumables noted apart

Electrodes, inserts, coolant, thinner or stretch film are listed as consumables, since they are not counted into one piece.

Routing and stages

Routing is the order the part travels in. Cutting, turning, milling, welding, grinding, filling, coating, assembly and packing are set in sequence for each part. Each stage names the machine or work centre it usually runs on. A stage done by an outside vendor is marked as job work, so the planner knows material will leave the premises. Standard time per piece can be held on a stage where your supervisors have a figure they trust.

Revisions and sub-assemblies

A part made this year is rarely the part made last year, because buyers revise drawings and suppliers change what they are able to offer.

Drawing revisions

A revised drawing creates a new revision of the material list, and the earlier one stays readable for batches already made against it.

Sub-assemblies

A gearbox, a frame or a filled bottle can carry its own list and stages. A parent part then draws it in.

Where it is used

For any material or bought-out item, the parts that consume it can be listed. That saves a hunt through old files.

What the client sets up

Part numbering and how a drawing revision is written
Scrap allowance against each stage or material
Which stages are done inside and which go to a vendor
Who may change a material list once it has been used
Whether standard times are kept on stages at all

FAQ

Frequently asked questions

Can a material list have more than one level?

Yes. Sub-assemblies carry their own lists and stages, and how deep your structures run is settled when the parts are entered.

What happens to old batches when a drawing changes?

They stay against the revision they were made to. The new revision applies from the work orders released after it.

Must every consumable be listed?

No. Many units keep electrodes, coolant and film as plain store items and leave them out of the piece-level list.

Can two parts share one material list?

A list can be copied to a near-identical part and then altered. The two stay separate afterwards, so a change to one leaves the other alone.

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