No part is truly “weightless.” However, you may need to declare for a part with a value that can change depending on the part size.
Parts can have:
- A fixed chemical composition, but variable weight, and/or
- A variable chemical composition, but a fixed weight, and/or
- A variable chemical composition and variable weight
“Size” is also a term that may have multiple meanings depending on the product. For example:
- A piece of wire will have the same materials, Bill of Materials (BoMs) and chemical composition, but the length is variable and will dictate the size.
- Adhesive will have the same chemical composition, but the volume used will dictate the size.
Generating an FMD for a Part With Variable Weight
Using resin as an example of a weightless part, enter the “Resin” as the product in the declaration and then follow the steps below to enter the Product Details:
- Enter “Resin” as the New Product Name:
- Click to expand the Product Details section for “Resin.”
The Item Name will be pre-filled.
- Enter a Mass of “1.”
- Select the Unit of Measure in mg or g (defining to the smallest standard unit).
- Enter a Number of Instances of “1.”
- Enter the Instances Unit Type as “Each.”
This will change depending on the Product or Sub-Product. For example, wire or cable will likely have an Instances Unit Type of “Meter.”
- In the Homogeneous Materials table, enter the substance information for “Resin”:
When calculating the amount of “Resin” used in the overall product, use the substance information (percent of each substance) and multiply it by the quantity of “Resin” found in the BoM for that product.
Grams of Substance = g of Product x % of Substance/100
For example, 1 x 70/100 = 0.7 g
- Complete the remaining declaration and generate the XML.