Start with the current technical definition
Send the latest drawing revision, 3D model or approved sample information. A 3D model helps the manufacturer understand the geometry, while the controlled drawing identifies specifications that may not exist in the model.
Remove obsolete revisions from the RFQ package and identify the file that controls production.
The six inputs that support a practical review
A first enquiry does not need a long form, but it should answer the following questions.
- What is the part and which file revision is current?
- What material grade and condition are required?
- What quantity is needed now, and is repeat supply expected?
- Which tolerances, datums, threads or fits are critical?
- Is anodizing, coating, plating, painting or another finish required?
- What is the target delivery date and destination?
What happens after the RFQ arrives
The manufacturer reviews geometry, machine fit, setup, material, tooling, inspection and outside finishing before confirming the process and quotation.
If information is missing or contradictory, resolving it before machining is more valuable than receiving an immediate price based on assumptions.
Frequently asked questions
Which file formats are useful for a CNC quote?
A PDF drawing plus a STEP, STP, IGES or IGS model is a practical combination. DWG or DXF files can also support 2D geometry when the revision is controlled.
Can I request a quote before the design is final?
Yes, but identify the data as preliminary. The final quotation and production decision should be based on an approved revision.
Do I need to specify every inspection method?
No. Identify critical dimensions and any required records. The manufacturer can then propose a practical inspection approach for review.
What if I do not know the best machining process?
Send the functional drawing and requirement. The process route should be selected after reviewing geometry, material, tolerance and quantity.