For high-mix, low-volume CNC orders in Vietnam, define each part number as a separate controlled item. Record its revision, material, quantity, finish, inspection requirements and delivery stage. A shipment containing many different components may involve substantial engineering and setup effort even when the total number of pieces is small.
This guide helps international buyers organize a multi-part order so suppliers can quote a clear scope and receiving teams can identify what was delivered. It addresses the part-number basket, rather than promising a minimum quantity, standard lead time or universal small-batch price.
What makes high-mix, low-volume CNC orders different?
Low volume describes quantity; high mix describes variety. Ten pieces of one component and ten pieces of each of twenty components create different programming, workholding, material and inspection requirements. Similar appearance does not establish that two parts can share a setup or inspection routine.
Use the low-volume CNC sourcing guide for Hanoi to consider the broader sourcing fit. For a mixed order, the next step is a reliable line-by-line definition of the work.
Build a part-number and revision matrix
Send a spreadsheet or structured list alongside the controlled files. Give every item a unique part number and identify which drawing and model belong to it. State the applicable units and resolve conflicts between files before authorizing production.
| RFQ field | What the buyer should provide | Why it matters |
|---|---|---|
| Part identity | Part number, drawing/model references and approved revision. | Prevents a similar-looking item being treated as the same component. |
| Material and condition | Specified grade, form, condition and required evidence. | Allows material availability and permitted alternatives to be reviewed. |
| Quantity | Order quantity per item; separate forecast and optional price breaks. | Separates a firm release from possible future demand. |
| Finish and secondary operations | Finish specification, masking, treatment and included assembly. | Defines the delivered condition and process route. |
| Acceptance | Critical characteristics, inspection coverage and required records. | Makes evidence and review effort visible. |
| Delivery | Required stage, destination, packing and partial-shipment rules. | Shows which items must arrive together. |
A forecast is planning information unless the commercial agreement says otherwise. Do not combine annual demand and the first release into one quantity field. For the complete technical package, follow the CNC RFQ preparation guide.
Separate one-time effort from recurring unit price
Ask the supplier to identify programming, setup, fixtures, special tools or engineering charges separately where applicable. Confirm what is included in the unit price and what assumptions support reuse on a later order. A changed revision, different material or interrupted production route may require a new review.
Do not divide a setup charge by an optimistic lifetime forecast and compare that figure with another supplier’s first-order price. Compare the same release quantity, technical scope and commercial conditions. The quote comparison checklist helps expose differences in included work.
Group components only where the process supports it
You can identify families with similar stock, finishes or manufacturing features, but ask the supplier to confirm whether grouping is technically useful. Different tolerances, workholding or inspection requirements can outweigh apparent similarity. Keep material identity and revision control intact when several items share a purchase or production stage.
Clarify whether the quotation requires all lines to be purchased together. If only part of the basket is released, the price and schedule may need to be reviewed. Likewise, confirm how a shortage or clarification on one item affects the remaining items.
Agree delivery by item, kit or release
Some projects need a complete kit; others can accept staggered deliveries. Identify which parts form a usable set and which can arrive independently. Agree who authorizes a partial shipment and how extra packing, freight or document work will be handled.
For recurring demand, link the part matrix to the blanket-order and release plan. Keep revision changes visible at release level. A new file in an email should not silently replace the definition of work already in progress.
Keep inspection and packing traceable by part number
Inspection results should identify the component, revision and relevant sample or lot. Define the required coverage for each item rather than using one ambiguous statement such as “all inspected.” Use separate identification where visually similar components could be mixed.
If the order includes finishing or assembly, agree the process boundaries in the multi-operation scope checklist. A pre-finish dimension and a finished-part acceptance result may answer different questions.
A practical planning example
Hypothetical planning example, not a TDB customer case: a buyer needs twelve part numbers, each in quantities of five to twenty pieces, across three materials and two delivery stages. The buyer first groups the lines by required delivery stage, identifies the components needed as complete kits and marks the drawings with unresolved questions.
The supplier then reviews feasibility and separates any one-time charges from recurring prices. Before the purchase order is issued, both sides resolve open material or finish questions and confirm the acceptance records for each line. This example illustrates the information flow; it does not establish a price, production capacity or delivery commitment.
Before releasing the order
- Confirm the final file register and approved revision for every line.
- Resolve quotation exclusions and technical questions by part number.
- Agree partial deliveries, complete-kit requirements and approval responsibilities.
- Define the change process for work already in progress.
- Match packing labels and delivery records to the accepted items.
Frequently asked questions
Can several CNC part numbers be quoted together?
Yes. Provide a structured part list and controlled files for each item, and ask the supplier to identify exclusions and open questions by part number.
Does ordering more part numbers always reduce unit cost?
No. Different geometry, setups, materials and inspection requirements can create separate costs. Compare the actual quotation assumptions.
Can different parts be shipped in stages?
Agree this before ordering, including packing, document traceability, completion dates and any additional shipping charges.
Discuss your project with TDB Hanoi
Send TDB Hanoi a controlled part list, available drawings and models, quantities by part number, and your required delivery stages. Ask for a feasibility review and clarification of the quotation scope.
