Introduction
Approving a CNC order is more than accepting a unit price. Before production begins, the buyer and manufacturing partner should agree on the technical reference, quantity, finish, inspection basis, delivery timing and commercial assumptions.
A short approval checklist can prevent misunderstandings that are expensive to correct after machining has started.
1. Confirm the drawing revision
Make sure the quotation and order reference the same drawing revision. Check the part number, revision, date and any associated CAD model. If a design change has been made since quotation, request a new review rather than assuming the old price and lead time still apply.
Record which file controls if the drawing and model contain different information.
2. Confirm the material
The order should identify the exact material grade and any temper, heat treatment or material certificate requirement. “Aluminium” or “steel” is not always sufficient for production.
If an alternative material has been proposed, record it explicitly and obtain engineering approval before release. Material changes can affect strength, corrosion behavior, machining, finishing and cost.
3. Confirm quantity and price basis
Review the ordered quantity, sample quantity, repeat quantity and any minimum order assumption. Confirm whether the quotation includes:
- Material
- CNC programming or setup
- Tooling or fixtures
- Surface finishing
- Inspection
- Packaging
- Shipping
- Taxes or other charges
Ask for unclear items to be listed separately. A low unit price is not useful if important process costs have been left out.
4. Confirm tolerances and functional features
Review the critical dimensions, datums, hole locations, fits, threads and geometric tolerances. Make sure any functional requirement has been communicated to the manufacturing partner.
Do not assume that every drawing note has the same production priority. Identify the features that control assembly or performance and agree how they will be inspected.
5. Confirm surface finish and appearance
Check the finish type, color, surface condition, masking, cosmetic areas and any dimensional effect. For anodizing, coating, polishing or heat treatment, confirm the process scope and acceptance standard.
If appearance matters, provide reference images or sample standards where possible. Words such as “high quality” are not a measurable acceptance criterion by themselves.
6. Confirm the inspection plan
Before production release, agree on the inspection features and required evidence. Depending on the project, this may include:
- Dimensional inspection report
- Material certificate
- First-article inspection
- Photographs of critical features
- Quality records
Confirm the measurement method, datum reference, acceptance criteria and report format. Certification and inspection capability must be confirmed for the selected partner; they should never be assumed.
7. Confirm sample and approval gates
For a new part or supplier, define whether a sample or first article is required before the full quantity. Agree who reviews the sample and what happens if a critical feature is outside specification.
A clear approval gate can reduce the risk of releasing a full production quantity before the part has been checked.
8. Confirm lead time and delivery
Record the lead time basis and the events that start the clock. For example, lead time may begin after drawing approval, payment, material confirmation or sample approval.
Confirm:
- Target ship date
- Delivery destination
- Shipping method
- Packaging requirements
- Tracking or shipping documents
- Responsibility for export and delivery coordination
A delivery promise should be based on the confirmed material, quantity, finish and inspection plan.
9. Confirm communication and records
Keep the approved quotation, drawing, order confirmation, inspection records and shipping information together. Name the person responsible for technical questions and the person responsible for commercial approval.
Written records reduce the chance that an important decision remains only in an email thread or informal message.
Final CNC order approval checklist
- Part number and drawing revision match
- CAD model matches the approved drawing
- Material grade and condition confirmed
- Quantity and price basis confirmed
- Critical tolerances and functional features reviewed
- Finish and cosmetic requirements confirmed
- Inspection method and documents agreed
- Sample or first-article gate defined
- Lead time and ship date recorded
- Packaging and delivery responsibility confirmed
- Commercial approval recorded
How ExactMach supports order coordination
ExactMach coordinates suitable manufacturing partners for custom machined parts. Before an order is released, the project information is checked against the approved drawing, material, process, quality and delivery requirements. Production, supplier selection, pricing and final commercial commitments remain subject to human approval.
FAQ
Should I approve production from a quotation alone?
Review the quotation together with the controlled drawing, finish requirements, inspection basis, delivery terms and commercial assumptions. A quotation alone may not contain every production detail.
Is a sample always required?
Not always. The need for a sample depends on part risk, complexity, quantity, tolerance, customer quality requirements and the confidence in the approved process.
What is the most important item to confirm?
The drawing revision and the functional requirements are a good starting point. They should be followed by material, finish, inspection, quantity, price and delivery confirmation.
Request an order-readiness review
Send the approved drawing and quotation for a structured pre-production review.