Reverse Engineering · Parametric Modeling · Scan-to-CAD
Reverse engineering with parametric modeling
We reconstruct parametric CAD models with design history from 3D scans, STL files, meshes, or point clouds. The result is fully editable. We create native models in SolidWorks and CATIA V5.
If no suitable 3D data is available yet, we can also handle the 3D scanning of the component. The goal is not merely a change in format, but a technically usable design that can be further processed.
Example Model Structure
Basic Sketch
Extrusion
Drilling Pattern
Rounded Edges
Feature History
Parametric CAD with a traceable model structure
A Selection of Our Clients and Institutions
Projects for industry, small and medium-sized businesses, research institutions, and other organizations in Germany and Europe.
Brief Technical Answer
What does the customer receive with a parametric reconstruction?
A parametric CAD model is neither a smoothed scan mesh nor a simple STL-to-STEP export. The geometry is reconstructed from scratch and provided as a fully editable native CAD model with a design history.
Parametric CAD Modeling
More Than Just Geometry: A Model That Can Be Further Edited
In parametric modeling, relevant geometric elements are reconstructed as CAD features. This allows sketches, parameters, and feature structures to be edited in a targeted manner later on. This is precisely what distinguishes a native parametric model from a simple polygon mesh or a neutral solid without a design history.
Defined Initial Geometries
Technical contours are created in a clear and logical manner during the CAD design process and serve as the basis for additional features.
Holes, Radii, Extrusions
Standard geometries are not simply copied as surfaces, but are created as structural elements of the model.
Changes remain traceable
The model structure allows for targeted adjustments, redesigns, and variations without having to rebuild the entire geometry.
STEP-Solid or native CAD?
A STEP model is not automatically parametric CAD
A STEP Solid can be a CAD solid that is highly usable from a technical standpoint. However, it typically does not contain a native design history with editable features. For redesign, variant design, or native further processing, a parametric model may therefore be more suitable.
| Property | STEP Solid | Native parametric CAD |
|---|---|---|
| Closed CAD Solid | Yes | Yes |
| Neutral System Compatibility | Very good | Depends on the native CAD system |
| Design History | Usually no | Yes |
| Editable features | Limited / system-dependent | Yes |
| Targeted changes to dimensions | Possible, but less convenient | directly provided for |
| Typical Output | STEP / STP | SolidWorks / CATIA V5 |
From a Scan to an Editable Design
The Technical Process of Parametric Reconstruction
We don’t start with the CAD system; we start with how it will be used later on. Only once it is clear which geometries are functionally relevant and how the model will be further processed is the reconstruction strategy determined.
01 Data basis
Component, STL, mesh or point cloud.
02Review data
Evaluate relevance, quality, and completeness.
03 Recognizing geometry
Planes, axes, bores, radii, symmetries.
04 Building Features
Create sketches and constructive CAD elements.
05 Design Intent
Distinguish between actual geometry and nominal geometry.
06 Check
Compare CAD against scan reference.
07 Hand over
Native CAD, neutral data, drawing.
Design Intent
The scan shows the current condition. The CAD model should represent the correct design.
Especially in the case of used, warped, or damaged components, a simple 1:1 copy of the scanned surface is not necessarily the best approach. In parametric reconstruction, it is determined which geometry should actually be retained and which should be technically idealized.
Convert to meaningful nominal dimensions
For example, a measured bore of 8.0153 mm can be used to design a specified 8.0-mm geometry.
Standard geometric specifications instead of measurement noise
Radii are adjusted to plausible nominal radii. Surfaces can be modeled as true planes, even if the actual part deviates slightly due to manufacturing or aging.
Leveraging Constructive Relationships
Existing symmetries and recurring geometric patterns are utilized when they can be derived from the component, its function, or the documentation.
Reconstructing Missing Geometry
Damaged or missing sections can be technically restored if their function, repetition, or existing information allow for a reliable reconstruction.
Don’t just blindly copy from the scan interface
Threads are not simply recreated as scanned thread surfaces. The bore geometry required for subsequent manufacturing is prepared during the design phase.
Apply nominal dimensions
If technical drawings are available, defined dimensions and existing design specifications can be incorporated into the reconstruction.
Limitations of the Data Set
What a 3D scan cannot automatically detect
A 3D scan captures geometry. It does not automatically include the original design intent or all of the component’s functional specifications.
Input Data & Output
What data can we import, and what do we return?
A parametric reverse engineering project can begin with a physical part or with existing 3D data. If no suitable data is available, we will perform the 3D scanning ourselves.
For native CAD data, we clarify the desired CAD system and the required software version before the project begins. This helps prevent compatibility issues during subsequent processing.
Technical Specifications at a Glance
Parametric Reverse Engineering: An Overview of Technical Capabilities
Quality inspection
Scan accuracy, CAD deviation, and nominal geometry are not the same thing
The accuracy of data acquisition describes the quality of the scan. The CAD deviation describes the distance between the reconstructed model and the scan reference. An idealized nominal geometry, on the other hand, may intentionally deviate from the actual measured surface.
Technical drawings
From Reconstructed CAD to a 2D Drawing
If desired, technical drawings containing the views and dimensions required for the project can be generated from the parametric CAD model.
- Elevations and Cross-Sections
- Dimensions based on the reconstructed model
- Supplementing Existing Drawing Information
Assemblies
Merging Multiple Reconstructed Components
When reconstructing multiple related components, they can also be combined into a CAD assembly and used for other technical tasks.
- Installation and Collision Analysis
- Retrofits and Machine Modifications
- Integration of Reconstructed Replacement Parts
Which type of model makes sense?
Not every project requires parametric CAD
The key factor is the intended use. If a feature history is not required, a STEP solid or a surface reconstruction may be more cost-effective.
Parametric CAD
For redesign, variations, and native further processing
Useful for regular geometric machine components, holders, flanges, housings, hole patterns, and anywhere else where dimensions or features are to be specifically modified later on.
Volume Model
When a technically usable solid is sufficient
A STEP solid file may be sufficient for collision detection, installation space verification, documentation, or further technical processing.
Area return
For complex free-form surfaces
For organic shapes, design surfaces, tool contours, or complex free-form geometries, NURBS-based surface reconstruction may be more appropriate.
Parent
Reverse Engineering & Scan-to-CAD
If it is not yet clear which type of model is needed, we start by defining the problem and select the appropriate reconstruction method.
Project Management
What we need for an initial technical assessment
In many cases, photos, approximate dimensions, existing data, and information about how the CAD model will be used later are sufficient to start with.
Frequently Asked Technical Questions
Parametric Modeling in Reverse Engineering
The most important questions about editable CAD models, input data, design history, and quality control.
What is a parametric CAD model?
What is the difference between STEP and parametric CAD?
Can a parametric CAD model be created from an STL file?
Can existing point clouds be used?
Which native CAD systems does Scanmotion support?
Does the model have an editable design history?
How are wear and manufacturing tolerances handled?
Can technical drawings be generated?
Can assemblies be reconstructed?
How is the reconstructed CAD model verified?
What happens if there is no 3D data available yet?
Why is the CAD version important for native data?
Request Parametric Reverse Engineering
Do you have the part, a scan, or an STL file?
We do not need complete technical documentation for an initial assessment. Photos, approximate dimensions, available data, and the intended use of the CAD model are often sufficient.
3D Project Hub
Have the project reviewed briefly
We determine the data source, the desired model structure, the CAD system, and the most appropriate test procedure.