Flexible manufacturing systems (FMS) exist to solve exactly this problem. They combine CNC machines, robotics, and computerized control so a plant can shift between products or volumes without shutting down for days. This article covers what FMS actually is, how it works, the different types, the core components, and where it shows up in real automotive and industrial settings.
Key Takeaways
- FMS links CNC machines, robots, and computer control so production adapts to new parts or volumes with minimal downtime
- Match FMS type to your mix: sequential, random, dedicated, engineered, or modular
- Upfront investment is high, but FMS cuts long-term labor costs and machine idle time
- Integration partners like GLOBAL Automation Technologies reduce implementation risk by supplying both the system and the engineers to run it
What Is a Flexible Manufacturing System (FMS)?
A flexible manufacturing system is an automated production setup that links two or more CNC or programmable machine tools through a host computer and automated material handling. That's the core definition NIST established in its 1986 survey of FMS installations, and it still holds up today.
The real differentiator is coordination across machines, software, and material handling. A fixed automation line runs one sequence, on one product, indefinitely. An FMS can be reprogrammed or rerouted to handle a different part or process order without a major rebuild.
That distinction matters for buyers. Fixed automation suits high-volume, low-variety production. FMS suits lower-to-medium volume, higher-variety work, which describes most automotive Tier 1 suppliers and general manufacturers today.
How Does Flexible Manufacturing Work?
At a working level, three systems talk to each other constantly:
- The control computer receives the schedule and assigns part programs to machines.
- Material handling (conveyors, AGVs, or pallet systems) moves the workpiece between stations, buffers, and inspection points.
- CNC machines and robots execute the assigned operation, switching programs as the part changes.
Two flexibility types keep the line moving:
- Routing flexibility: the system can change the order of operations
- Machine flexibility: more than one machine can run the same task, so a bottleneck at one station doesn't stall the line
Human engineers still run the show behind the scenes: programming new part routines, troubleshooting faults, and tuning schedules for throughput. FMS cuts manual loading; it does not replace process expertise.
A quick historical note: Jerome Lemelson holds early US patents on computer-controlled flexible production, with work often dated to the mid-1950s. Theo Williamson's Molins System 24, presented in the UK in 1967, is a well-documented early system that combined machine tools, conveyors, and computer tracking for continuous operation. Both threads shaped modern FMS.
Core Components of a Flexible Manufacturing System
Every FMS, regardless of industry, is built from four pieces working together:
- Smart machines and robotics: CNC machines, robotic arms, and automated assembly cells that reconfigure for different part programs without a full retool
- Material handling systems: Conveyors, AGVs, and pallet systems that move parts between workstations and buffer storage, keeping machines fed even during changeovers
- Computerized control systems: Software that manages scheduling, inventory tracking, quality checks, and real-time adjustments when a machine goes down or a priority job comes in
- Human expertise: Engineers and technicians who program routines, maintain equipment, and optimize cycle times—the layer that keeps automation running smoothly
GLOBAL Automation Technologies, a Level 5 FANUC Authorized System Integrator, integrates these components end-to-end: layout, robotics, programming, and validation. The company works primarily with FANUC robots and layers in machine vision for part location, orientation checks, and random bin picking.
Those capabilities let a cell handle multiple part types without physical retooling. Collaborative and vision-guided tending setups suit high-mix, lower-volume production especially well, where quick reprogramming beats hard retooling every time a job changes.
Types of Flexible Manufacturing Systems
Not every FMS looks the same. A useful (though vendor-originated, not ISO-standardized) taxonomy breaks FMS into five types:
| Type | Best fit | Example use case |
|---|---|---|
| Sequential | Predefined production order | Furniture, appliances |
| Random | On-demand switching between product types | Electronics, automotive parts |
| Dedicated | Long-term, high-volume, limited product set | Medical devices |
| Engineered | Custom-built for specialized, precision parts | Aerospace components |
| Modular | Shifts between the other four modes | High-mix general manufacturing |
Modular is the most adaptable. A plant can dial flexibility up or down as demand shifts, which helps when a manufacturer doesn't know a year out whether they'll need high-mix or high-volume output.
Across these types, most FMS designs share one common building block.
What Is a Manufacturing Cell?
A manufacturing cell is a grouped cluster of machines or robots dedicated to a family of related parts. Several cells, linked by material handling and a shared control system, make up the larger FMS. One cell alone isn't an FMS. It becomes part of one once it's coordinated with other machines and centralized scheduling.
Benefits and Challenges of Flexible Manufacturing Systems
Where FMS pays off
- Faster adaptation to demand or product changes without a full line rebuild
- Higher machine utilization: NIST-documented FMS installations reported rates of 66%–90%, far above typical idle time on manually loaded standalone machines
- Lower long-term labor costs, since one operator can oversee multiple automated stations
- More consistent quality, because programmed routines remove operator-to-operator variability
Where FMS gets hard
- High upfront investment: core equipment is often only about a third of total installed cost once tooling, guarding, and controls are included
- Complex implementation, requiring careful process study and simulation before launch
- Reliance on skilled technicians to program, maintain, and troubleshoot the system after startup
Those utilization numbers aren't a guaranteed uplift for every plant. They're documented cases, not an industry average. Directionally, they show what's achievable when handling and scheduling are automated instead of manual.
Flexible Manufacturing System Examples in Action
These deployments show how shared tooling, automation cells, and programmable processes cut changeover time and raise utilization on real production floors.
Automotive assembly. Ford's Flat Rock plant ran different vehicle platforms on shared body and final-assembly tooling, switching between Mustangs and Mazda 6 vehicles without dedicated lines. Ford reported a 50% reduction in changeover cost and time.
GM's Toledo Powertrain facility applied the same idea on the machining side. CNC controls, RFID pallet tracking, and PLCs across dozens of machine tools brought changeovers down from weeks to hours.
Machine tending. A documented FANUC customer case showed a machine-tending cell hitting a 33-week ROI with a 33% efficiency gain. The cell ran 20 to 24 hours a day instead of stopping whenever an operator needed a break, which cut idle spindle-hours and raised parts per shift.
Painting and dispensing. Robotic painting systems commonly hold film-thickness tolerances around ±0.2 mil—tighter and more consistent than manual spraying—and cut material waste from overspray.
GLOBAL's painting systems use the same approach. Engineers tune spray patterns, robot paths, and film-build parameters per part geometry so the line can switch finishes or substrates without a full booth reconfiguration.
How GLOBAL Automation Technologies Helps Manufacturers Build Flexible Systems
Adopting FMS isn't just a hardware decision. It requires the engineering bandwidth to design, program, and run it, which is where GLOBAL's dual-division model stands out.
- Delivers turnkey robotic systems integration and the technical staffing to run it in a single engagement
- Supplies controls, mechanical, and project management engineers so flexible lines stay staffed after go-live
- Models and tests robot programs virtually before deployment, cutting programming time from weeks to days
- Flags equipment issues early with AI-driven health assessments to protect uptime and avoid surprise repairs
- Brings 18+ years in the field, 630+ robots integrated across 22 countries, and work in automotive, heavy industry, and general manufacturing
For a manufacturer weighing whether FMS makes sense, system design plus embedded engineering talent shortens the gap between deciding to automate and running production.
Frequently Asked Questions
What is a flexible manufacturing system (FMS)?
An FMS is an automated production system that links CNC machines, robots, and computerized control so a plant can adapt to changes in product type or volume. It's defined by coordination between machines, not just the presence of automation.
How does flexible manufacturing work?
A central computer schedules jobs, material handling systems move parts between stations, and CNC machines or robots execute the assigned operations. Engineers monitor and adjust the system as needed.
What is a key characteristic of a flexible manufacturing system (FMS)?
The ability to reconfigure or reprogram for a new part or process order without major downtime. That's what separates FMS from fixed, single-purpose automation lines.
What are the different types of flexible manufacturing systems?
Sequential, random, dedicated, engineered, and modular are the five commonly referenced types. Each fits a different mix of volume and product variety, with modular being the most adaptable.
What are some examples of flexible manufacturing systems?
Automotive assembly lines that switch between vehicle models, robotic machine-tending cells that extend unattended CNC operation, and dispensing/painting systems that adapt finish parameters by part type.
What is a manufacturing cell?
A manufacturing cell is a grouped set of machines or robots handling a family of related parts. It's the building block that, combined with other cells and centralized control, forms a larger FMS.
