Building Information Modelling (BIM) has transformed how buildings are designed, coordinated, and documented. Digital models now enable multidisciplinary teams to collaborate within shared information environments, improving coordination and reducing errors throughout design and construction.
However, a critical question remains within digital construction:
Can BIM models reliably support fabrication and CNC-based manufacturing?
In many projects, BIM models are primarily used for coordination, clash detection, and documentation. Yet, when projects move toward industrialised construction or digital fabrication, models must do more than represent geometry; they must contain structured, validated, and fabrication-ready information.
Without clear information governance, the transition from digital models to fabrication environments often becomes fragmented. Geometry may be transferred between software platforms, but the reliability, consistency, and traceability of the underlying information remain uncertain.
This is where structured information management becomes essential.
The international standard ISO 19650 provides a framework for managing information across the lifecycle of built assets. While the standard does not directly control manufacturing technologies such as CNC machining, it establishes reliable information workflows that enable BIM models to support fabrication processes with confidence.
Information management as the foundation of digital fabrication
ISO 19650 structures project information management into key stages, including procurement, planning, and production.
At the outset, the client defines the required information through Exchange Information Requirements (EIR), specifying what information is needed and when it must be delivered.
During the planning stage, the BIM Execution Plan (BEP) defines how information will be created, managed, and exchanged. This includes modelling strategies, responsibilities, and information delivery workflows across the project team.
As the project progresses into production, teams collaboratively develop information models to support coordination and construction. Within this structured environment, BIM models can evolve beyond coordination tools into reliable sources of fabrication data.
When fabrication is part of the delivery strategy, BIM workflows naturally extend toward digital manufacturing processes.
Extending BIM workflows toward fabrication
Digital fabrication workflows enable the translation of BIM-based information into manufacturing data.
A simplified workflow can be described as:
BIM model → fabrication model → CAM toolpaths → CNC manufacturing
Within the ISO 19650 framework, the reliability of this workflow depends on how information is managed within the Common Data Environment (CDE). Information progresses through defined states:
Work in Progress → Shared → Published → Archived
Only validated and approved information should be used for downstream processes such as fabrication and CNC production. This ensures that manufacturing workflows rely on trusted, coordinated, and consistent data.
When implemented effectively, this structured approach creates a continuous digital thread linking design models directly to manufacturing processes.
In this context, adherence to ISO 19650 workflows is what ensures that BIM models can be confidently transformed into manufacturing-ready data for CNC production.
Case study: digital fabrication of a wooden staircase
To illustrate this workflow, a wooden staircase fabrication process was examined as a practical case study.
The staircase geometry was initially developed within a BIM environment using Autodesk Revit. The parametric model defined key components, including treads, risers, stringers, and handrails, establishing the spatial configuration and dimensional relationships of the staircase.
The geometry was then transferred to specialised fabrication software (e.g., StairBiz), where additional manufacturing parameters were introduced. These included machining allowances, joint definitions, and component segmentation required for production.
The fabrication model provided the necessary level of detail for downstream processes.
Subsequently, the geometry was processed within a CAM environment, where machining strategies and toolpaths were generated. These defined cutting sequences, routing paths, and drilling operations for each component.
The CAM system then generated machine instructions in the form of G-code, which were executed by CNC machinery to produce the timber components.
The CNC fabrication process produced stair elements — including treads, risers, and stringers — with high geometric accuracy. These components were then assembled to form the completed staircase.
This case study demonstrates how BIM information, when properly structured and managed, can extend beyond design coordination and directly support digital fabrication.
Integrating BIM and digital manufacturing
The integration of BIM workflows with digital fabrication technologies offers several key advantages:
- Improved consistency between design models and manufacturing data through structured information management
- Enhanced traceability and version control via Common Data Environments (CDE)
- Higher precision and efficiency in the production of bespoke components such as staircases, façades, and complex joinery
Together, these benefits support the transition toward more industrialised and digitally integrated construction processes.
Closing the gap between design and production
As construction increasingly shifts toward industrialised and digitally driven methodologies, the relationship between design information and manufacturing systems becomes critical.
ISO 19650 provides the governance structure required to support this transition. By ensuring that project information is clearly defined, validated, and properly shared, BIM models can become trusted sources of manufacturing data.
The staircase case study demonstrates how BIM-based workflows can extend into fabrication environments and ultimately drive CNC production.
ISO 19650 does not manufacture components , but it ensures that the information used to manufacture them is accurate, coordinated, and reliable.
As digital construction continues to evolve, integrating structured information management with fabrication workflows will be essential in bridging the gap between digital design and physical production.
Discussion
How are engineering teams currently connecting BIM workflows with fabrication or CNC manufacturing processes?
Are digital fabrication workflows already integrated within your projects, or does a gap still exist between BIM coordination models and manufacturing environments?
From 3D to 10D ,and from BIM to CNC ,is ISO 19650 the key enabler in your workflow?
Shahin Khalilian, PhD, MBA, MIET
Architectural Engineer | BIM Specialist | Digital Construction Researcher
