A clear drawing package helps a supplier identify what is being requested and where clarification is needed. It also makes competing quotations easier to compare. The objective is to present one controlled requirement for each part, with commercial quantities and inspection expectations attached.
Start with a simple document register
List the part number, description, drawing revision, file name and quantity for every line. If a model accompanies a drawing, identify which revision it represents. State which document controls when information differs, and resolve known conflicts before asking for a firm quotation.
A revised file should be accompanied by a clear revision instruction. Avoid sending several folders named ‘latest’ without identifying which files are active. Keep superseded material separate from the enquiry package so that it is not mistaken for an alternative manufacturing instruction.
Define what must be made
- Material designation, applicable specification and required supplied condition.
- Dimensions, tolerances, datums and critical interfaces shown on the controlled drawing.
- Thread designation and any mating-component information needed for review.
- Surface finish, coating or treatment requirements.
- Inspection, identification, packing and document requirements.
- Any customer-controlled process or approval step that affects the supply scope.
Do not add a tight tolerance to every dimension simply to make the enquiry appear complete. State the design requirements that actually apply. If a critical requirement is unresolved, mark it as an open item rather than letting a supplier’s quotation become an unintended design approval.
Use models and drawings together
A 3D model can help communicate shape, while a controlled drawing can identify requirements that are not obvious from shape alone. Confirm file units and scale, and ensure the files refer to the same part and revision. A photograph or sketch may support an initial discussion, but final quotation and manufacture can require additional controlled information.
WISINE’s drawing enquiry page describes drawing and model information for review. Follow the upload form’s displayed file-type and size limits; if a needed format is not accepted, agree a transfer method instead of renaming an unsupported file extension.
Separate prototype and production quantities
List prototype quantity, initial production quantity and any requested repeat-order scenario separately. Distinguish required quantities from estimates. Provide the destination and requested delivery date so that logistics and timing can be discussed without treating either as a confirmed commitment.
If several parts form a kit, provide both the quantity per kit and the number of kits. Identify bought-in hardware, customer-supplied items and excluded work so that suppliers quote the same boundary.
Review deviations before selecting a quotation
Use a comparison sheet covering drawing revision, material, process assumptions, finish, inspection, quantity, exclusions and open questions. Require deviations to be visible. A lower price is not directly comparable if it excludes an inspection report or assumes a different material condition.
Record approved clarifications in the order documents. Do not rely on a chain of informal comments to replace the released drawing package. When a revision changes the requirement, ask for its effect on the quotation to be reviewed.
Send a controlled enquiry
Review the custom metal parts range and RFQ preparation guide, then submit the document register and current files. WISINE can review the supplied requirements; manufacturability, documentation and commercial terms remain subject to that order-specific review.
Discuss Your Specification with WISINE
Send the product type, material requirement, dimensions, quantity and current drawing or specification for review.
Sources and Further Reading
This article supports procurement preparation. Use the approved drawing, applicable standard edition and project requirements for design and acceptance decisions.
