The drawing is where reverse engineering becomes something you own and can reorder against. It should distinguish what was measured directly from what was reconstructed, state the material decision and its basis, and be reviewed by someone who knows the application before it is approved.
6 min read · Last reviewed 28 September 2026 · All resources
On a worn sample these are genuinely different kinds of information, and collapsing them into a single set of numbers hides the uncertainty. A mounting face that never wore is a measurement; a journal diameter that has run for years is an inference.
Marking the difference lets you direct your review where it matters, and gives you something concrete to check against the mating part.
The supplier knows the sample. You know the application, the assembly and the history. Approval is where those two bodies of knowledge meet, and it is not a formality.
Check the reconstructed features against whatever independent evidence you hold: the mating component, an assembly drawing, a second example of the same part from another machine.
Agreements reached by phone or email have a way of not reaching the drawing. The approved item should be a specific revision, and any change after that should produce a new one.
This matters most at reorder, often years later, when nobody remembers what was agreed verbally.
The first-off should be inspected against the drawing and, where possible, trial-fitted. Feedback from that trial belongs back on the drawing before repeat parts are made.
Then keep it somewhere you will find it. The value of the exercise is largely in never having to repeat it.
FAQ
The questions engineers and buyers ask before sending a drawing. If yours is not here, ask it directly — you will get an engineer's answer, not a brochure.
Still have a question?
Talk to Anita M.N, Managing Partner, or send the drawing and let the review answer it.
It depends on the part's complexity and how much reconstruction is needed. Ask for the assessment and drawing stage to be quoted separately from manufacture, so the sequence is visible.
Often yes, as a separate piece of work. Whether it makes sense depends on whether you intend to manufacture elsewhere or simply want the documentation.
Agree it up front. A 2D drawing is what gets approved and quoted against; a 3D model is useful alongside. Ask for both if you have use for both.
Say so — that is precisely what the approval step is for. You may hold evidence the supplier does not, such as the mating part or the original application.
Start a project
Share what you are trying to make or fix. Our engineering team reviews every enquiry and responds with the questions that matter, a feasibility view and next steps.
