An enquiry is not a production release
Sending a drawing asks the manufacturer to review feasibility and price. It does not automatically authorise machining. The production revision, quantity and commercial scope need to be confirmed when the order is placed.
If there are three PDFs of the same part in a folder, do not leave the shop to guess which one applies. Match the part number and revision across the filename, drawing and purchase order. This is simple administration that prevents very real workshop mistakes.
Complete the technical information
The drawing defines dimensions, tolerances and special requirements; the 3D model helps explain the geometry. If they disagree, settle which information governs before cutting material. Confirm the grade, finishing operations and features that matter to function.
List sample quantity, production batch and estimated annual demand separately. A forecast is not a firm order. Also say whether your required date means dispatch from the shop or arrival at your premises.
Approve the scope, not just the price
Agree the drawing revision, material supply, outside processing, inspection documents and packaging. Close any technical queries before placing the order. A tolerance change discussed by telephone should reach the approved technical file.
For many new parts, it makes sense to separate sample production from the main batch. The need depends on the part's risk, previous experience and customer requirements; it is not a fixed rule for every job.
Check more than appearance
A clean-looking part can still have an incorrect mating surface, thread or geometric relationship. Review the measurement results against the drawing and carry out any required functional checks. Reports should be traceable to the samples inspected.
Record the part, revision and samples approved. If changes are needed, state whether production must wait. Approval does not remove the need for inspection during the production run.
Close the loop at delivery
Check quantity, packaging, documents and incoming acceptance together. Keep the approved drawing and change records for repeat orders. The next batch should build on what was learned, rather than start the discussion from scratch.
Related guides
- Preparing a machining RFQ
- STEP models and engineering drawings
- Low-Volume CNC Machining: What Changes at 10, 100 and 1,000 Parts?
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