CNC

From Air-Gapped CNC Machines to Governed Digital Workloads

Inkwelldata

26 Feb 2026 • 2 min read

CNC machines are central to modern manufacturing. They execute G-code instructions to mill, drill and shape high-precision components used in automotive, aerospace, electronics and medical devices.

By the next decade, more than 2.8 million CNC machines will be installed globally. Many cost hundreds of thousands of pounds and are designed to operate reliably for 20–30 years.

        However, the digital systems around them often remain disconnected from modern enterprise platforms.
    

The Structural Challenge

Much of the global CNC estate still relies on RS-232 or USB serial interfaces, generation-specific controller logic, legacy embedded computing, and air-gapped configurations.

These machines were effectively not designed for enterprise connectivity or modern cyber governance.

Yet manufacturers now operate under increasing obligations, including NIS2, national critical infrastructure rules and industrial cyber security standards.

Without structured integration, organisations face

Limited real-time machine visibility

Weak traceability of production events

Vendor-dependent integrations

Poorly governed remote access

Inkwell Data's OT–IT Platform

Inkwell Data addresses this through a structured integration pattern built on our OT–IT platform, Altior, transforming legacy CNC machines into governed digital workloads without altering firmware or disrupting production.

Behavioural Digital Twin

Each machine is modelled as a digital twin.

G-code commands are translated into defined digital events, and key machine data such as temperature, position and execution status is formally captured.

Secure Edge Mediation

A local controller manages communication at the machine boundary, ensuring clear separation between OT and enterprise systems, no direct exposure of controllers to corporate networks, secure communication to the central platform, and policy-driven execution with logging and state control.

        This aligns with established OT security principles and supports NIS2 compliance requirements.
    

Governed Workloads & Integration

Application logic orchestrates secure program transfer, controlled execution and state monitoring.

Standard APIs enable integration with digital twins, analytics and reporting platforms.

The architecture supports validation and production-scale deployment.

Strategic Value

This establishes a repeatable reference architecture for integrating long-life industrial assets into modern enterprise environments.

It enables

Scalability across large estates

Security-by-design at the OT boundary

Operational transparency and auditability

Reduced vendor dependency through abstraction

        Legacy CNC machines become governed digital workloads aligned with enterprise and regulatory expectations.
    