Bill of materials
What goes into one unit of this part, one level down. Sub-assemblies have their own BOMs; the full explosion at the bottom of the page walks every level and multiplies the quantities through, so a bike that needs two wheels that each need 32 spokes shows 64 spokes.
The buildable banner
"You can build N. Binding constraint: …" — the smallest of (on hand ÷ quantity per) across the stocked components, and the component that sets it. It counts what is on the shelf, not what could be built from what is on the shelf. Components that are not stocked (phantoms) are skipped and counted; when there are any, the number is an upper bound.
Components
| Column | Meaning |
|---|---|
| # | Line number |
| Component | The child part |
| Qty per | How many per one unit of this part, in the child's unit — 2.5 metres of tube per frame |
| Reference | Designators: R1, R2, R3 on a PCB, left on a frame. Free text |
| On hand | The child's total on hand, or not stocked for a phantom |
| Consumed at | Which routing step uses this line. First step when unallocated. This is what lets a work order's hub-build step ask only about hub parts and leave the tyre for the tyre step |
Planners edit the line number, quantity and reference inline (Update), allocate a step from the dropdown, remove a line (🗑), and add one from the form below: pick a part, quantity per, reference. A new line takes the next number after the highest, so deleting line 1 and adding its replacement leaves a gap and puts the newcomer last.
Renumber rewrites the numbers as 1, 2, 3… in one of two orders. By routing follows the order the steps consume the lines — unallocated lines first (they go to the first step), then step by step, part number breaking ties. By part number is what it says. Or type a number into a line and press Update to move just that one; two lines cannot share a number.
A part cannot contain itself, directly or through any chain: the add is refused, and the database refuses it too. The same child may appear on two lines (two different operations).
Phantoms
A component whose part is not stocked is a phantom: built inside the same work order and consumed by the next step without ever being shelved. The explosion passes through it to its own components, and a work order step's materials list expands it the same way. Phantoms are rare; if it ever sits on a shelf, it is stocked.