CNC machining RFQ guide

Align the drawing and CAD release.

Provide the part number, revision, units, 2D drawing, and agreed 3D model format. Identify the authoritative requirements and resolve conflicts between files. Mark preliminary features. Include threads, datum references, geometric tolerances, and special notes where the design requires them.

• List all files and revisions in the RFQ package.
• Identify critical characteristics, mating features, and acceptance criteria.
• Require written clarification of proposed deviations before manufacture.

Specify material and the complete processing route.

State the material grade and condition rather than only a broad alloy family. Identify required heat treatment, grinding, coatings, anodizing, plating, or other secondary operations. Ask who performs each operation and how the part will be measured after processing.

• Define material certification and lot traceability where required.
• Specify surface finish and coating requirements, including masking if relevant.
• Clarify whether dimensions apply before or after treatment and finishing.

Connect tolerances to an inspection plan.

Tighter tolerances may affect fixturing, machining sequence, and measurement. Identify functional tolerances without adding arbitrary precision. Ask candidates to explain how they will measure critical features and report results; do not assume a particular machine or inspection system is available.

• Define first-article measurements, sampling, and shipment documentation.
• Identify surface-roughness measurements and gauges needed for special features.
• Agree how nonconformances and measurement disagreements will be handled.

Distinguish prototype and production demand.

Request prices at defined order quantities and describe expected annual demand and release timing. Clarify setup and fixture charges, minimum quantities, and material lead-time assumptions. A prototype route may differ from the intended repeat-production process; ask whether the quoted approach changes with volume.

• Identify sample quantities and buyer approval timing.
• Define packaging that protects critical surfaces, threads, and finished coatings.
• State delivery terms and any required part identification.

Review quotation exceptions and first articles.

Compare the finished-part scope, material, secondary processing, inspection, fixtures, exclusions, and quote validity before comparing price. Obtain written approval for substitutions or deviations. Define the first-article acceptance gate before production release. Arxline can coordinate RFQ questions while researching and evaluating independent Vietnamese machining candidates.