Illustrative sourcing scenario. This is a hypothetical buyer case for learning, not a documented TDB customer project. Names, prices, quantities and events do not represent an actual order or verified market statistics.
A CNC quote scope gap can turn a lower unit price into a higher comparable order cost when finishing, inspection and preparation requirements differ. In this hypothetical Vietnam sourcing case, a buyer avoids an unconditional price ranking by aligning the scope before releasing a purchase order.
The situation: two prices for what appeared to be the same order
An international equipment buyer prepares a first order for 200 aluminum components. The intended purchase includes machining to the released drawing, the specified finish, an agreed dimensional report and protective packing. The buyer requests two offers and initially compares the recurring unit prices.
Option A shows USD 14.00 per part. Option B shows USD 12.50. At first glance, Option B appears USD 300.00 cheaper across 200 pieces. The problem is that the two unit-price lines do not cover the same deliverables.
The names and figures are invented for this teaching example. Neither option represents TDB, a competitor quotation, a typical Vietnam rate or a documented commercial dispute.
The warning signs that should stop the ranking
The lower offer contains an abbreviated description and leaves the finish and report scope unclear. It lists preparation separately without explaining its repeat-order treatment. Packing is not included in the recurring unit price. The buyer’s own comparison sheet treats the unanswered fields as if they were included.
An incomplete quotation is not automatically dishonest or unsuitable. The immediate issue is whether the supplier and buyer have agreed the same scope. The useful response is to ask specific questions and obtain a revised written offer.
| Question | Why it matters in this scenario |
|---|---|
| Which drawing revision was quoted? | The price must address the same released requirement. |
| Does the price include the specified finish? | A machining-only price is not the same purchase as a finished component. |
| What does the dimensional report cover? | A few selected features and an agreed full report can require different work. |
| Which preparation charges are separate? | The first-order subtotal needs the applicable setup/programming or fixture scope. |
| Is protective packing included? | A bare-part price does not establish the shipment-ready scope. |
| Which costs remain outside both offers? | A manufacturing comparison is not a complete delivered or landed cost. |
CNC quote scope: the normalized comparison
For the illustration, assume both suppliers confirm the same drawing, quantity and deliverables. The following charges are then recorded. A zero in an included row means that the service is explicitly covered elsewhere; it does not mean the service has no cost.
| Illustrative first-order cost, USD | Option A | Option B |
|---|---|---|
| 200 parts × recurring unit price | 200 × 14.00 = 2,800.00 | 200 × 12.50 = 2,500.00 |
| One-time preparation | 200.00 | 300.00 |
| Required finishing | 0.00 — explicitly included above | 400.00 — separate |
| Agreed inspection/report | 0.00 — explicitly included above | 150.00 — separate |
| Protective packing | 100.00 | 100.00 |
| Comparable modeled production subtotal | 3,100.00 | 3,450.00 |
| Subtotal per ordered part | 15.50 | 17.25 |
Under these assumptions, Option B’s comparable production subtotal is USD 350.00 higher, or USD 1.75 per part. The initial unit-price advantage disappears when the excluded scope is included.
This calculation excludes freight, insurance, brokerage, import charges, taxes and any other unlisted cost. It must not be described as a complete landed-cost comparison. Those inputs require their own confirmed or clearly identified estimated values.
The underlying problem: an unclear purchasing baseline
The failure occurs at the handover between engineering and purchasing. Engineering expects a finished and documented component. Purchasing ranks an abbreviated recurring price. The supplier responds to a narrower or insufficiently clarified enquiry. Each side may be discussing a different order without realizing it.
The lesson applies to sourcing decisions generally; this example is not evidence that Vietnamese suppliers routinely omit charges. Use the RFQ package checklist to define the requirement before bids are requested.
Recommended resolution before the first PO
- Issue one controlled file list with drawing, model, material, finish, quantity and required records.
- Mark every deliverable as included, excluded or unresolved for each bidder.
- Ask suppliers to confirm the actual inspection and packing scope, not just their availability in principle.
- Separate recurring prices from preparation and other first-order charges.
- Obtain revised written quotations after resolving the differences.
- Compare technical fit, evidence and delivery dependencies alongside the normalized subtotal.
If an order has already been released, establish what was actually agreed before authorizing additional work. Record the revised scope, price and schedule through the agreed change process. This article does not determine which party owes money in an actual contractual dispute.
What satisfactory closeout would look like
The recommended closeout is a comparison sheet linked to the accepted quotation and technical revision. Unknowns have named owners and deadlines. The PO identifies what is being bought, the agreed records, the delivery milestone and the applicable charges.
No actual saving or successful delivery is claimed here. This is the decision record a buyer should seek before treating the two offers as comparable. For a repeat order, check which preparation charges recur and whether the quantity, route or material basis changes.
Carry the lesson into transport and acceptance planning
Official Incoterms guidance explains the allocation of transport-related tasks, costs and risk. Agree the named place and edition separately from inspection acceptance, payment and title. A quoted shipping label does not resolve every commercial term.
Use the full quotation-comparison and landed-cost guide for the working checklist. For Canada-specific onboarding, follow the Canadian OEM sourcing guide.
Frequently asked questions
Was the cheaper supplier necessarily a poor choice?
No. Clarify the offer and evaluate the complete scope. This scenario shows why an abbreviated unit-price comparison is insufficient.
Is the USD 350 difference a Vietnam benchmark?
No. All amounts are hypothetical inputs for the illustrated 200-piece comparison.
Can a blank quotation line be treated as included?
Do not assume so. Request confirmation and retain the revised offer before ranking or releasing the order.
Apply the checklist to your next CNC enquiry
Send your controlled drawing package, quantity, required finish, inspection records and delivery destination. Identify the inclusions and exclusions you need confirmed so the quotation can be compared on a consistent basis.
