Tiếng Việt
Reverse engineering is a technique used to turn 3D scan data into the 3D CAD data you need. Reverse engineering makes designing products and creating 3D files from existing products faster and much more accurate.Reverse engineering is a technique used to turn 3D scan data into the 3D CAD data you need. Reverse engineering makes designing products and creating 3D files from existing products faster and much more accurate. On top of that, reverse engineering keeps being refined so it can be applied in many different industries, improving product quality and speeding up the creation of 3D drawings for those products. Reverse engineering is also known as Scan to CAD. Step 1: Prepare the part for 3D scanning. This means cleaning the part, choosing a suitable fixture for scanning, placing markers, and noting any areas that will be hard to scan and how to handle them.
Step 2:
Use reverse engineering software to build the 3D product, a 3D CAD model, from the 3D scan data (STL data).
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Contact CT3D Group
CT3D Group – professional 3D printing, 3D scanning, design and rapid prototyping services nationwide.
- CT3D Thu Duc – Ho Chi Minh City, Hanoi, Hai Phong: in3d.edu.vn – Hotline 0975 008 728 (Mr. Thai)
- CT3D District 6 – Ho Chi Minh City: 3dmaker.vn – Hotline 038 7798308 (Mr. Phuc)
How is reverse engineering different from just 3D scanning?
3D scanning produces mesh data made of hundreds of thousands to millions of triangles that describe the object’s surface. This data works for 3D printing a copy or for archiving, but it is very hard to edit dimensions, and it has no information about planes, hole axes or fillets. Reverse engineering rebuilds a solid or surface CAD model from the scan data. The engineer identifies the original design intent: which faces are flat, which holes are coaxial, and which dimensions should be rounded to standard values. The result is a STEP or IGES file, or a native CAD file with a feature tree, that can be edited and used for machining.
Common levels of reverse engineering
| Level | Description | Best for |
|---|---|---|
| Freeform surfacing (auto surface) | Automatically fits NURBS surfaces to the mesh, keeping the actual shape | Statues and organic parts that need a CAD file for quick mold making |
| Feature-based modeling | Rebuilds with sketches, extrudes, revolves and so on, with a feature tree | Mechanical parts that need editing or CNC machining |
| Hybrid | Mechanical areas modeled by features, freeform areas surfaced | Product housings, car and motorcycle parts |
Tips for getting a quality reverse-engineered CAD file
- Provide the part with the least wear and deformation; if you have several samples, choose the best one as the reference.
- Tell the engineer in advance about critical fit dimensions, required tolerances and any thread or bolt standards.
- Be clear whether you need to “copy the current condition” or “restore the nominal design”, since the two give different results.
- Ask for a deviation report comparing the CAD file and the scan data to assess model quality.
Reverse engineering is especially useful for making discontinued spare parts, improving existing products or digitizing old molds that no longer have drawings. If you need to turn a physical part into a machining-ready CAD file, see the CT3D Group reverse engineering service based on 3D scan data.
Frequently asked questions
Is reverse engineering legal?
Reverse engineering to repair, replace parts, do research or improve your own products is a common engineering practice. However, copying and selling products protected by someone else’s design or patent rights may infringe intellectual property, so check before you start production.
What software is typically used for reverse engineering?
Dedicated software such as Geomagic Design X is often used to process the mesh and build CAD, which can then be moved to SolidWorks, NX, Creo or CATIA for finishing. The choice depends on the CAD system the customer uses.
How accurate is a reverse-engineered file?
Accuracy depends on the scanner, the condition of the part and the level of modeling. For mechanical parts, the deviation between the CAD and the scan data is usually kept within a few hundredths of a millimeter to a tenth of a millimeter, depending on requirements.
Can a broken or worn part be reverse engineered?
Yes. The engineer scans what remains and uses symmetry, datum faces and fit information to rebuild the original shape; customers should also provide mating parts or photos of the original product if available.
Related services at CT3D Group
- Reverse engineering services
- 3D scanning services – high-accuracy 3D scanning
- Custom 3D design services
- CT3D Group network: ct3dgroup.com · in3d.edu.vn – Hotline/Zalo 0975 008 728
