What Is 3D Scanning?
3D scanning is the process of transferring the dimensional and geometric data of physical parts to a digital environment.
3D scanning is a technology that records the surface geometry, dimensions, and form of a physical object as numerical data. It has a wide range of applications in industrial manufacturing — from digitizing parts without technical drawings, to quality control measurements, mold revision preparation, and product development processes.
How Does 3D Scanning Work?
Laser-based 3D scanners project laser light onto a part's surface, measure the reflections, and calculate the spatial coordinates of each point. When these coordinates are evaluated together, they form a dataset called a point cloud. The point cloud is then converted into a mesh (surface network) format to produce STL or similar outputs. If reverse engineering is required, CAD formats such as STEP, IGES, or Parasolid are derived from this data.
Red Laser and Blue Laser Technology
Two main laser technologies are used in 3D scanning processes. Red laser is a common and suitable choice for general industrial applications. Blue laser can provide more balanced scanning results, particularly for parts with shiny, dark, or transparent surfaces. The laser technology to be used is determined based on part geometry, surface characteristics, and project requirements.
Accuracy and Measurement Limits
Under suitable conditions, 3D scanning can be performed at accuracy levels down to ±0.03 mm/m. However, this value varies depending on part geometry, surface condition, and scanning environment. Depending on project conditions, large parts up to 10 meters can be evaluated. Details at the 5 mm level can also be included in the scanning scope depending on part geometry and surface conditions. The actual accuracy value is always clarified within the project scope.
Output Formats
3D scanning produces point cloud and mesh data as raw output. Common output formats include:
- STL — widely used mesh format; used as input for simulation, prototyping, and reverse engineering
- Point cloud — raw measurement data; suitable for high-precision comparison and analysis
- STEP, IGES, Parasolid — delivered as CAD models produced after reverse engineering
- PDF technical drawing — prepared when measurement reports or 2D projections are required
When Is 3D Scanning Used?
3D scanning is deployed at multiple critical stages in industrial manufacturing:
- Preparing parts without technical drawings for reverse engineering
- Dimensional deviation analysis of serial production parts against reference CAD models
- Documenting the current state of existing molds before revision
- Digitizing worn or damaged parts for re-manufacturing
- Verifying prototype geometry during product development
- On-site measurement of large machine or component parts
What You Want to Know.
- What is the difference between 3D scanning and traditional contact measurement?
- Contact measurement (CMM) takes high-accuracy readings at specific points, while 3D scanning captures the entire surface geometry as numerical data. This makes scanning clearly advantageous for parts with complex geometry, curved surfaces, and freeform designs.
- Which materials can be measured with 3D scanning?
- Many materials such as metal, plastic, composite, cast, and ceramic are suitable for 3D scanning. Additional preparation steps or blue laser technology may be required for shiny, transparent, or dark-colored surfaces; this is evaluated at the start of the project.
- In what format are 3D scanning results delivered?
- Depending on the project scope, STL mesh, point cloud, or — if reverse engineering is completed — CAD data in STEP, IGES, or Parasolid format can be delivered. For measurement and quality control projects, a deviation/tolerance comparison report can also be prepared.
- Is on-site 3D scanning service possible?
- Depending on part size, location, and project scope, on-site 3D scanning service can be evaluated. For large machine bodies, installed equipment, or parts that cannot be transported, this option is discussed at the start of the project.
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