Key takeaways
- Write requirements, not solutions: loads, envelope, interfaces, standards and target cost.
- Agree deliverables up front: native CAD, STEP, drawings to ASME Y14.5 or ISO, BOM.
- Insist on staged reviews — concept, detail, drawings — before the next stage starts.
- Sign an NDA first and make sure all rights transfer to you on payment.
When outsourcing mechanical design makes sense
- Your team is at capacity and a project deadline is fixed.
- You need a skill you use occasionally — FEA, weldment design, sheet metal, trailers or lifting equipment.
- You have legacy parts with no usable drawings and need them modelled and documented.
- You want a design that is ready for a specific manufacturing process or supplier.
Write a brief that describes the problem
The most common cause of a disappointing outsourced design is a brief that describes a solution instead of the requirements. A good brief fits on two pages and covers:
- Function: what the part or machine must do, and how it will be used and abused.
- Loads and environment: forces, duty cycle, temperature, corrosion, outdoor use.
- Envelope and interfaces: available space, mounting points, mating parts (send STEP files).
- Standards: drawing standard (ASME Y14.5 or ISO), units (inch or metric), industry codes that apply.
- Manufacturing: target processes, quantities and target cost per unit.
- Deliverables and deadline.
Deliverables to agree before work starts
| Deliverable | Why it matters |
|---|---|
| Native CAD files (e.g. SolidWorks) | You can edit the design later without rebuilding it |
| Neutral files: STEP, DXF, PDF | Any supplier can quote and cut from them |
| Fabrication and assembly drawings | Tolerances, GD&T, welds and finishes your shop needs |
| Bill of materials and cut lists | Purchasing and costing |
| Calculation or FEA report | Evidence for safety-critical or load-bearing parts |
Run the project in stages
- Kick-off: confirm requirements, units, standards and deliverables in writing.
- Concept: rough 3D layouts so you can judge space, access and cost drivers early.
- Detail design: full 3D, with FEA where loads or deflection matter.
- Drawing package: drawings, BOM and export files, checked before release.
- Optional: prototype, test and revise.
A short review call at the end of each stage costs little and prevents expensive rework at the drawing stage.
Protect your intellectual property
- Sign a mutual NDA before sharing files.
- State in the contract that all rights to the design transfer to you on payment.
- Ask which subcontractors, if any, will see your files.
- Make sure you receive native files, not only PDFs.
How design work is priced
Small, well-defined jobs are usually quoted at a fixed price. Larger or exploratory projects are often priced per stage, with a fixed price for the concept and an estimate for detail design that is confirmed once the concept is approved. Hourly billing suits open-ended support. Whatever the model, ask for the assumptions behind the quote.
See how we run mechanical design projects, or read our DFM checklist to make designs cheaper to build.
Frequently asked questions
Who owns the design when I outsource it?
That depends on the contract. At Mechline Engineering we sign your NDA before you share files and all rights transfer to you on payment.
Can an outsourced engineer work to our drawing standard?
Yes. Ask for your title block, units and standard (ASME Y14.5 or ISO) to be used from the start.
More guides
- Contract manufacturing in Turkey: a practical guide for US and European buyers
- Manufacturing in Turkey vs China: cost, lead time and risk compared
- DFM checklist for CNC machined, sheet metal and welded parts
- RFQ checklist: what to send for an accurate manufacturing quote
- When do you need FEA? A practical guide for product teams