CMM – Coordinate measurement machines have come a long way and serve an interesting history. Once, all measurements were taken with hand tools, making consistency and accuracy difficult to achieve. However, from their origins almost 60 years ago to modern-day CMMs, they have revolutionized the quality control process. Now, precise and accurate measurements are achievable with these automated technologies.
As of now, over 6000 coordinate measurement machines are produced every year. This number is growing as technology advances. The advanced CMMs we see today have been developed through numerous innovations and have progressed through various developmental stages. In this article, you’ll get to know the remarkable history of CMMs, modern CMM technology, and its impact. Additionally, we’ll discuss the challenges, limitations, and future outlook. So let’s get started.
The Origins of Measurement in Manufacturing
Manufacturing has always been closely tied to precise measurements. Long ago, in the early days, ancient civilizations also used various tools for measurement. Egyptian stonemasons and Roman architects developed calibrated ropes and other standard measuring tools for accurate measurements. Following the Industrial Revolution, various other manual tools were introduced. These include instruments like Vernier calipers and micrometers. However, these require some expertise. As the industry advances, the need for precise equipment drives the introduction of CMM technology.
The Beginning of CMM Technology – The Timeline
60 Years Ago – The Birth
So, the CMM technology originated with the British company Ferranti. This was the company that manufactured the world’s first commercial computer. This event dates back almost 60 years and is one of the first steps toward CMMs. The machine used a 2-axis configuration. It was used for precisely measuring relatively small military components.
1959 – The International Machine Tool Exhibition
At the Paris International Machine Tool Exhibition, CMM made its public debut. Since then, CMMs have revolutionized precision in quality control in various iterations.
1960 – The First 3-Axis Coordinate Measuring Machines
Although 3-axis machines were still available, they lacked digital readouts. Then, 10 years later, in 1960, the first stationary 3-axis CMM was introduced. It was used to access the spatial coordinates of the objects. But it was manually operated, without software, using rigid probes. About who launched it remains a mystery, as two contenders – Ferranti and DEA – claim to be the first. This was the time when big companies from countries like Japan, the US, France, and Germany also began producing dimensional measuring equipment, joining the machine trend. They were available in various sizes and used by global businesses.
Post 1970- The Shift To CNC-CMMs
The introduction of CNC (Computer Numerical Control) marked a significant breakthrough for the manufacturing industry. After the 1970s, there was a shift from manual systems to automated quality control systems.
Now, operators could use automated numeral control to program and transmit digital instructions. They could conduct routine inspections to ensure consistent results.
CMM and Dimensional Measurement Advancements
Touch Probe
The kinematic resistance probe, also known as the trigger touch probe, was an incredible invention by Sir David McMurtry. It detected contact and allowed controlled overtravel, enabling precise, repeatable point capture. It was a major 1972 invention that enabled the Concorde aircraft to meet specific requirements. This invention led to 3D measurement. Additionally, enabling automated, repeatable routines in production.
3D Systems
With the invention of the touch probe, the performance of the classic 3-Axis CMM was improved. The touch-trigger probe lets the machine take precise points on a surface and log their XYZ coordinates. This made 3D measurement faster, more accurate, and easier to automate. The motorized probe head reduced manual work. Until 1980, additional features were introduced. These included probe-changing racks and affordable scanning probes.
Hardware Innovations
Along with other innovations, CMM hardware was also improved to a stiffer, lighter, and more durable design. As a result, accuracy was improved.
Additionally, the use of measuring scales was a significant innovation, improving machine accuracy across all environments. The granite base remained in the design.
However, with the advancement, as large forces were involved after 1980, new probe types demanded tougher materials. Therefore, silicon carbide bases were introduced. They provided a robust structure and better properties.
Meteorology Software
Through the 1980s, PC-based metrology software was introduced. It used more low-cost PCs, resulting in improved CMM accuracy. Additionally, the inspection cost was reduced. Wenzel, a German company, launched this metrology software.
Optical portable CMMs
Further advancements led to optical portable CMMs. It resulted in improved efficiency, portability, and accuracy.
As innovations are added to the system, CMM technology is becoming more advanced. Laser-based, contactless probing systems offer new operational opportunities.
Modern CMM Capabilities
- Multi-sensor measurement: Combines touch probes with optical and laser scanning. It captures tight tolerances, sharp edges, and free-form surfaces in a single run.
- CAD alignment and GD&T: Aligns parts to CAD, evaluates GD&T, and generates clear, shareable reports for audits and customers.
- Shop-floor readiness: Portable arms and shop‑floor CMMs handle heat, vibration, and mixed‑model work near production.
- Automation and speed: Motorized heads, probe racks, and scripted routines cut setup time and reduce operator touches.
- Reliable results: Produces traceable, repeatable data that teams can compare across lines, plants, and suppliers.
The Impact of Modern CMM Technology
Modern CMMs shorten launch cycles and reduce scrap. In-process checks catch drift early, so teams fix tools before defects spread. CAD-based programs and SPC dashboards improve decisions and prove capability to customers. Large-volume tools, molds, and fixtures can be verified in place, cutting rigging and transport time. Portable and robotic systems support mixed‑model production without stopping the line. Overall, shops get higher first‑pass yield, cleaner audits, and faster PPAPs with less rework.
Challenges and limitations
CMMs still need stable fixturing, clean parts, and good datum strategies. Thermal shifts, vibration, and poor programming can erode accuracy. Complex probes and multi-sensor setups raise training needs. Additionally, they increase maintenance costs.
Throughput can be bottlenecked when scans are too dense or programs lack optimization. Data overload is another risk if results are not filtered, trended, and tied to actions. Integration with MES/PLM and version control must be well managed to maintain a “single source of truth.”
Future Outlooks
CMMs are moving toward smarter, faster, and more connected use. Expect more multi-sensor arrays, higher-speed scanning, and stronger shop-floor compensation. AI will suggest paths, detect outliers, and tune sampling for risk‑based inspection.
Digital twins will link design, processes, and measurements to provide live tolerance feedback. Portable and robotic CMMs will expand in‑situ checks, while cloud reporting will standardize quality across plants. The goal is simple: measure closer to production, decide earlier, and keep quality predictable at scale.
Conclusion
Now, to conclude, the advanced CMM technology you see today is the result of a marvelous history. It is tied to continuous innovation, precise measurement, and a quality control system. However, the innovation does not end here; it will continue to evolve. It will influence the future industrial processes and help us find ways to improve accuracy. With the widespread application of these machines across industries, CMMs signal a brighter future.