How to Request a CAD Design or Mechanical Engineering Quote
A practical RFQ checklist for outsourced CAD drafting, mechanical design, and manufacturing drawings: what to share, what to specify, and how to compare proposals.
Begin with the decision or deliverable you need
A useful engineering request starts with the outcome. Do you need an editable 3D model, a checked manufacturing drawing package, a new mechanism, or a DFM review before tooling? These are different tasks with different inputs and review effort.
Describe the product, its users, operating environment, and current stage. Identify whether the engineer must develop a design or document an existing design. If you only have sketches or photographs, say so; missing CAD does not prevent an initial scoping discussion.
Share the files and their current revision
For existing products, share the latest CAD, drawings, bill of materials, and relevant change notes. Include part and assembly counts and distinguish released files from working drafts. Use neutral formats such as STEP for geometry exchange and agree native CAD formats and software versions where editable feature history is required.
State which files control if the model and drawing disagree. Mark critical interfaces, inspection features, materials, finishes, and any known manufacturing problems. Share only information you are authorized to disclose and agree confidentiality before transferring sensitive design data.
Specify drawing and handover expectations
For a manufacturing drawing package, define the drawing standard, units, sheet templates, part numbering, revision convention, and required BOM structure. Confirm whether the work includes GD&T, tolerance analysis, flat patterns, DXF files, or assembly instructions.
For sheet metal, provide material, gauge, bend assumptions, and the intended supplier when known. For plastic components, provide the resin, expected volume, cosmetic surfaces, and tooling stage. These inputs help the engineer identify missing design decisions before drafting begins.
Explain schedule, quantities, and review responsibilities
Include the desired delivery date and any external dependency, such as a prototype build, supplier RFQ, or design review. Identify who can answer technical questions and approve each milestone. A quoted schedule should include time for client review and resolution of missing inputs.
If manufacturing support is included, state prototype, batch, and annual quantities separately. Distinguish engineering fees from prototype parts, tooling, inspection, shipping, and certification costs so that competing proposals cover the same scope.
Compare fixed scope work with monthly capacity
A fixed scope quotation is suitable when the outputs and inputs can be defined. Ask what is included, which assumptions affect the price, how many revision rounds are covered, and how additional work is approved.
Reserved monthly engineering capacity is useful for an evolving backlog of CAD updates, ECO/ECN work, and sustaining tasks. Agree how time is reported, who prioritizes the backlog, and how work is reviewed. WENS offers 40, 80, 120, or 160+ hours per month, with scope and commercial terms agreed before starting.
A brief you can use for your first enquiry
Include: product and intended use; current design stage; work required; part and assembly counts; available files and revisions; native CAD and drawing requirements; materials and critical interfaces; target deadline; and the person responsible for technical review. Identify anything still undecided.
You do not need to resolve every detail before contacting WENS Engineering. Send a short summary and the files you have, or start with a pilot project. Our India based technical team and USA and Canada representation support remote collaboration with product teams internationally.
Key Engineering Takeaways
- Define the outcome before requesting a price.
- Share revision controlled inputs and identify unresolved design decisions.
- Specify native CAD formats, drawing standards, and handover files.
- Compare proposals using the same scope, assumptions, and revision allowance.
- Use a pilot project or reserved monthly capacity to match your workload.
Related Engineering Services:
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