A drawing, a quotation and a packing list can show different weights for the same enquiry. Before treating the difference as an error, check what each figure covers. One may describe a calculated single component, another several supplied parts, and another the packed shipment.
The useful question is: are these figures for the same identified items, quantity and condition, on the same measurement basis? Keep unexplained differences open until the supplier provides a written reconciliation.
1. Put a basis beside every weight
Copy the figures into one comparison record. For each entry, record:
- Complete part reference, description and relevant drawing revision.
- Whether it covers one component, a defined assembly or a package.
- Quantity and unit: for example, kg per piece or kg for the whole line.
- Condition: new, used, worn, repaired or otherwise modified.
- Whether the figure is calculated, estimated or measured, and its source and date.
- Which fittings, other components and packaging are included or excluded.
Do not fill a missing basis by assumption. A number headed only “weight” needs clarification. If part identity is also uncertain, use the part identification checklist first.
2. Ask what the drawing figure represents
A mass calculated from a CAD model is not a weighing record for a delivered part. Ask which model revision and component selection produced it, and which physical material was assigned.
For example, Autodesk documents that included hidden bodies and incorrect assigned material density can affect Fusion mass results. Its physical-properties documentation also states that results sum the selected objects. These are reasons to check the calculation basis; they do not show that a particular crusher-part drawing is wrong.
Keep the calculation labelled as calculated. If the quotation needs the weight of the supplied new part, ask when that figure can be measured and recorded. Do not use the weight of a worn sample as an agreed new-part weight without clarification.
3. Reconcile quantity before comparing totals
The following figures are invented solely to explain the arithmetic. They are not product specifications, actual measurements or a GUBT quotation.
| Record | Assumed basis | Figure |
|---|---|---|
| Drawing | One component, calculated | 500 kg per piece |
| Quotation | Two components, estimated total net weight | 1000 kg |
| Packing estimate | Same two components plus 80 kg of packaging | 1080 kg gross |
Here, 500 kg × 2 = 1000 kg, and 1000 kg + 80 kg = 1080 kg. The three figures describe different scopes. They do not, by themselves, show a part-weight discrepancy. The calculation also does not confirm the eventual measured weight or whether the parts meet their specification.
If two records still disagree after quantity and scope have been aligned, ask the supplier to identify the remaining difference. Do not invent an acceptable percentage variation from this example.
4. Keep product weight separate from packed weight
Net and gross weight must be compared on the same scope. Net excludes packaging; gross includes it, as set out in DHL’s invoice-field guidance. A single-part net weight should not be compared directly with the gross weight of a mixed pallet.
For a mixed package, ask which part lines and quantities make up its net total. Then identify the packaging contribution separately. Keep preliminary estimates marked as estimates, and agree when the final package figures will replace them. The packing checklist covers the package identifiers, dimensions and receiving information to record alongside those figures.
5. Close the difference with a written decision
Use a short clarification request:
Please reconcile the weight for this reference and revision. State the included items, quantity, units and condition; identify each figure as calculated, estimated or measured; and separate net from gross weight. Please explain any remaining difference and confirm which record will be used for the quotation and final packing list.
Retain the response with the relevant enquiry line. If a different part, revision or assembly scope is proposed, review that change before accepting the revised total.
A reconciled weight does not establish material grade, dimensional fit or service life. Agree the required checks separately using the quality-document checklist. This comparison worksheet is not a lifting or installation plan.
For a GUBT parts enquiry, send the complete references, quantities and the figures requiring clarification. Share only documents you are authorized to provide. GUBT is an independent supplier; compatibility, supply scope and document availability are confirmed for each enquiry.
