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CMM COMPASS Choose by Features Portable CMM: A Complete Guide to Types, Features, and Selection

Portable CMM: A Complete Guide to Types, Features, and Selection

Contents.
What You Will Learn in This Article
  • Key features and technical specifications of portable CMMs, including KEYENCE's XM and WM Series.
  • Step-by-step basic workflows and practical shop-floor applications for portable 3D measurement systems.
  • How portable CMMs streamline inspection, reduce setup downtime, and eliminate the need for part transport.

XM Series (KEYENCE)

Image of XM Series
Source: KEYENCE website (https://www.keyence.com/products/3d-measure/cmm/xm/)

The XM Series is a versatile portable CMM designed for use in a wide range of locations. It does not require a dedicated temperature-controlled measurement room, large installation space, or compressor, making it easier to perform measurements where they are needed.

The camera unit can be detached from the stage, allowing measurements in compact spaces such as offices as well as on-machine measurements with the workpiece fixed to the machine tool. With a maximum measurement range of 2 meters, the XM Series can also handle larger workpieces.

Operation is simple: users place the handheld probe on the area to be measured. Built-in tutorials provide step-by-step instructions with images, while the navigation function guides users through previously performed measurements in the same location and sequence. These features help make measurement easier, even for operators with limited experience.

With flexible installation, simple operation, and minimal setup requirements, the XM Series is designed to be easier to introduce into daily inspection work.

XM Series Specifications

  • Repeatability: ±3 µm (typical)
  • Indication accuracy: ±(7 + 9L/1000) µm
  • Maximum measurement range: approx. W2000 × D1200 × H1000 mm
  • Minimum display unit: 0.0001 mm / 0.0001°
  • Environmental tolerance: +10 to 35 °C, 20–80% RH
  • Body weight: approx. 8 kg

WM Series (KEYENCE)

Image of WM Series
Source: KEYENCE website (https://www.keyence.com/products/3d-measure/cmm/wm/)

The WM Series is a portable CMM that can be carried in a dedicated suitcase and set up by connecting just two cables. Operators select the measurement elements on the monitor, place the probe on the target, and press a button, making it easy to use without advanced measurement expertise.

The main camera continuously tracks the position and orientation of the handheld probe, recognizing its location regardless of the operator’s position. This allows users to measure from different angles without moving the workpiece. Because communication between the camera and PC is wireless, the system is also easier to use in tight or complex spaces.

In addition to contact measurement, the WM Series supports non-contact laser scanning with a high-performance laser scanning probe. Using 30 multi-line violet lasers and a maximum measurement range of 25 m, it can capture 3D data from large parts, complex geometries, and freeform surfaces quickly.

The wide measurement range also helps one person inspect large components that would typically require multiple operators. This can reduce labor, shorten measurement time, and make it easier to inspect large workpieces that are difficult to measure with gate-type CMMs, vernier calipers, or micrometers.

With both contact and laser scanning probes available, the WM Series can support both dimensional measurement and shape capture for large-part inspection.

WM Series Specifications

  • Repeatability: ±10 µm (typical)
  • Indication accuracy: ±(28 + 5L/1000) µm
  • Maximum measurement range: up to W25,000 × D11,000 × H12,500 mm
  • Minimum display unit: 0.001 mm / 0.001°
  • Environmental tolerance: +10 to 35 °C, 20–80% RH
  • Body dimensions: approx. 328 × 357 × 251 mm

Basic Workflow for Portable CMM Use

Using a portable CMM typically involves a few basic steps. First, the device is positioned near the part and calibrated or zeroed to a reference base. Operators then use a handheld probe or scanning head to collect measurement points directly from the workpiece.

Many portable systems provide on-screen guidance and navigation, helping less experienced users complete standard inspection routines efficiently. After data capture, the software can generate dimensional reports, tolerance analysis, and CAD comparison results.

Specific Use Cases of Portable CMMs

Portable CMMs are used in a wide range of inspection scenarios. On the shop floor, they allow teams to verify large assemblies without moving heavy parts, helping reduce inspection time and labor.

In maintenance and field inspection, portable metrology tools help technicians check alignment, fit, and geometric tolerances directly on-site. They are also useful for tooling and mold inspection, where on-site dimensional checks can help maintain consistency and reduce downtime.

Frequently Asked Questions

Q. Can I compare portable CMMs by measuring range alone?

A. No. Check measurement performance over the required working volume, which features the probe can reach, the setup and reference procedure, and the reporting functions. Compare each system on the same representative part and tolerance.

Q. Can a portable CMM measure a part without removing it from a machine or assembly?

A. It may be possible if the instrument can be positioned safely and every required feature is accessible. Confirm part stability, probe or camera visibility, temperature, and the datum setup. A demonstration on the installed part is preferable to relying on a catalog range.

Q. What should I check after moving a portable CMM?

A. Follow the model's setup and reference procedure, confirm the part coordinate setup and environmental conditions, and run any required performance check before critical inspection. A previous setup may no longer be valid at a new location.

   

Top 3 Recommendations for CMM
by Application

For Ease of Use
and Versatility
XM Series(KEYENCE)

Source: KEYENCE Website(https://www.keyence.com/products/measure-sys/cmm/xm/index_pr.jsp)

This CMM has a caliper-like feel, enabling even beginners to perform high-precision measurements. It can be carried without the need for temperature control, allowing for immediate measurements at any desired location and time. As it doesn't require a large installation space, it's a CMM with a low entry barrier.

  • A unique handheld-type CMM that can be used with a caliper-like feel
  • Usable outside of the measurement room
  • Wide measurement range of up to 2m
KEYENCE Website Read More
For Measurement Accuracy
and Stability
ZEISS XENOS(Carl Zeiss)

Source: Carl Zeiss Website(https://www.zeiss.com/metrology/products/systems/cmm.html)

Utilizing linear drive on all axes, this CMM boasts high precision with a maximum permissible length measurement error of 0.3+L/1000μm, repeatability of ±0.2μm, and resolution of 0.001μm. The reduced occurrence of errors allows for a decrease in the need for remeasurement.

  • Maximum permissible length measurement error of 0.3+L/1000μm
  • Repeatability of ±0.2μm
  • Resolution of 0.001μm
Carl Zeiss Website Read More
For Smart Factory
Integration
CRYSTA-Apex(Mitutoyo)

Source: Mitutoyo Website(https://www.mitutoyo.com/products/coordinate-measuring-machines/)

A CNC CMM that was first developed in 1976.

It features applications that respond to the demand for "Smart Factories" by allowing monitoring of operational status and maintenance management of the machine through the network.

  • Developed by drawing on over 80 years of manufacturing expertise
  • Selection of optimal probe for the workpiece
  • Compatible with Smart Factory environments
Mitutoyo Website Read More

Reasons for Selection

  • Ease of Use and Versatility: Based on our research, these CMMs offers the highest precision and a wide measurement range among handheld devices usable outside the measurement room.
  • Measurement Accuracy and Stability: Among the surveyed options, these CMMs exhibit the highest values in terms of maximum allowable length measurement error, repeatability, and resolution.
  • Smart Factory Integration: Among the surveyed manufacturers, these CMMs are most extensively implemented as CNC CMM compatible with S.M.S. (SMART Measurement System).
KEYENCE Website