CMMs are essential tools for measuring the dimensions and shapes of objects in three dimensions. There are various manufacturers producing CMMs, but between their products there are differences in measurement accuracy, ease of operation, measurement method (contact / non-contact), measurement room requirements, inline or offline compatibility, etc. Because of this, choosing the right device can be challenging.
Here, we explain the different shapes and types of CMM construction, which can greatly impact their usage and application. If you're looking to choose a CMM that fits your specific environment, be sure to check this page.
Bridge-type CMMs have a structure resembling a bridge or gate when viewed from the front. Known for their high accuracy and stability, they are ideal for measuring objects that require high precision, such as medical instruments, gears, and optical components.
Bridge-type CMMs often require significant installation space and temperature-controlled measurement rooms. However, recent models offer more flexibility and ease of use. For more information on bridge-type CMMs from various manufacturers, please refer to the page below.
The CRYSTA-Apex, developed by Mitutoyo, is a versatile CNC CMM designed to meet the demands of the market. It integrates decades of expertise in 3D measurement technology with modern advancements, enabling high-speed and high-accuracy measurements for complex-shaped workpieces. This machine accommodates deviations between the workpiece and design values, facilitating fast measurements that are unaffected by machining precision or setup errors, making it particularly suitable for complex geometries such as turbines and blades.
With built-in temperature correction and sensors, the CRYSTA-Apex ensures accuracy within a range of 16–26°C, maintaining a maximum permissible length measurement error of 1 E0, MPE=(1.7+3L/1000)μm. Its ability to follow specified measurement paths allows for rapid and precise measurements while correcting for errors related to acceleration and deceleration. The system also supports 3D measurement paths for free-form measurement of complex surfaces.
Available in two configurations with varying measuring ranges, the CRYSTA-Apex is compatible with multiple probe types, making it suitable for a wide range of applications while effectively addressing the challenges of 3D measurement environments.
Arm-type CMMs feature a multi-joint arm that allows operators to move it freely and approach objects from various angles. This design makes them more versatile and flexible compared to bridge-type CMMs, and they don’t require a dedicated measurement room, making them ideal for on-site measurements alongside the production line. That said, they do have limitations when it comes to measuring very large objects or intricate shapes that exceed the arm's range.
The Gage Max FARO ARM is an arm-type CMM from FARO, designed to enhance production processes and quality assurance. Utilizing articulated-arm measuring technology, it accommodates a range of applications, including inspection, reverse engineering, assembly, and surveying.
This device can be brought directly to production sites and supports wireless inspections via Bluetooth or Wi-Fi, removing the need for a dedicated measurement room and enhancing its versatility across various environments. With a compact design, it allows for easy single-handed operation and provides consistent measurement results in just seconds. Its ergonomic design facilitates use for individuals familiar with vernier calipers or micrometers.
Gantry-type CMMs have a distinctive design that integrates a fixed base with a sliding gate, enabling the main shaft to traverse a stationary table during measurements. This configuration is particularly well-suited for measuring large components, including automotive and aerospace parts, heavy items, and satellite communication equipment.
ALPHA, developed by Hexagon Metrology, is a versatile gantry-type CMM designed for the dimensional inspection of large cast iron and machined parts. It features high-productivity 3D scanning laser heads and continuous servo wrists, making it suitable for production processes involving molds. An optional bellows cover is also available to protect the machine from dirt.
Cantilever-type CMMs are designed similarly to a diving board, with one end securely fixed to a support structure and the other extending outward. This configuration allows for easy access to the workpiece from three sides, making it suitable for applications where operational efficiency is important.
ZEISS DuraMax is a compact and user-friendly CMM recognized for its high accuracy. Its small footprint enables easy integration into existing factory layouts without requiring additional space. Notably, it does not need an air supply, operating on a single power source and occupying just 0.85㎡, making it well-suited for manufacturing environments.
Handheld-type CMMs are compact and lightweight, enabling precise measurements in various settings. They effectively measure challenging objects that traditional bridge or arm-type machines may struggle with, and their high precision and broad measuring range make them suitable for a variety of applications outside measurement rooms.
Handheld-type CMMs are compact and lightweight, enabling precise measurements in various settings. They effectively measure challenging objects that traditional bridge or arm-type machines may struggle with, and their high precision and broad measuring range make them suitable for a variety of applications outside measurement rooms. Below, we introduce a popular handheld-type CMM.
The XM Series from KEYENCE is a handheld-type CMM that facilitates high-precision measurements by simply touching a probe to the object. Unlike traditional bridge-type CMMs, which move along fixed axes and require recalibration with each posture change, the XM Series allows measurements from any angle with its handheld probe.
Selecting the appropriate Coordinate Measuring Machine (CMM) depends on various factors, including the type of objects to be measured, the required precision, and the operational environment.
[Structure and Advantages]
By evaluating these factors, you can determine which type of CMM best meets your needs and operational requirements.
