Romer Infinite Portable Arm CMM

Romer Absolute Portable Arm CMM

The Romer Absolute Arm is the lightest most accurate and most flexible ROMER arm ever and draws inspiration and resources from the history and legacy of all ROMER previous portable CMM arm products .

ROMER Absolute Arm offers inspection precision in its most mobile form.

A first in the world of portable measuring arms the Romer Absolute Measuring Arm features proprietary absolute encoders in its primary axes allowing the arm to always know the position of its joints. The Romer Absolute is the first portable measuring arm which does not require any kind of homing procedure before starting to measure. When the arm is turned on its ready to go measure.

Lighter, Stiffer, more Accurate

From the carbon fiber tubes to the simplified dual yoke joint housings, the Romer Absolute Arm was designed to be the lightest and yet stiffest ROMER arm ever built. The base 2.5 meter arm weighs just 7.5 kg and much lighter lighter than the competitors 2.4 meter arms. Combined with the improved accuracy from its absolute encoders its the most accurate ROMER arm to date.

Absolute Flexibility

The all-new ROMER Feature Pack concept unfolds the full potential of a portable measuring arm. Utilizing a common docking connector to the base of the arm, feature packs allow you to add, remove, or change features on an arm as required. As new feature packs are released, an Absolute Arm can be upgraded in the field with new capabilities.


ROMER Infinite Arm in detail

1) Patented Infinite Rotation in the principle axes allows access to difficult to reach areas, while avoiding damaging the arm against rotational hard stops.

2) Kinematic Probe Joint, the same type used in Hexagon Metrology bridge CMMs, provides repeatable connection of probes, with no need for recalibration. Automatic probe recognition allows you to store hundreds of calibrated probe profiles for instant recall.

3) Compact Head is easy to hold, and is used to inspect parts or to interact with the software when in “mouse mode”. Integrated work light and digital camera to graphically document setups.

4) Patented SpinGrips are infinitely rotating, low-friction “approved” hand hold positions for better user ergonomics. SpinGrips allow the arm to “float” in the operator’s hands, reducing stress on the arm thus maximizing accuracy and repeatability while minimizing user fatigue.

5) Absolute Encoders improve overall accuracy and eliminate all complicated “homing” procedures.

6) Aerospace grade Carbon Fiber Tubes provide a lightweight, stiff structure that is thermally stable.

7) Low Profile Zero-G Counterbalance balances the arm’s weight for easy, operation with effortless control, even above and below the arm’s centerline. Better ergonomics means lower operator fatigue and better measuring results.

8 Integrated handle and lifting point under counterbalance allow for easy carrying.

9) Feature Packs plug into the base and provide interchangeable and upgradeable add-on capabilities such as WiFi connection, battery power, and more.

10) Universal thread mount base attaches to a variety of available base and stand options including magnetic bases.

Feature Pack Options for 6-Axis Absolute Arms:

  • Mobility Pack: A rechargeable battery and WiFi transmitter allows completely wireless use of the Absolute Arm.
  • “No Pack” Option: The Absolute Arm is completely functional without a feature pack, using a 110/220v power connection.


The ROMER Absolute 73 and 75 Arm models offer two different levels of performance and features to suit most inspection requirements.


6-Axis ROMER Absolute Arm Probing Specifications – 73 series

6-Axis ROMER Absolute Arm Probing Specifications – 73 series

1 The Point Repeatability Test is the reference test to determine measurement arm repeatability with ball probe. The cone is in front of the machine. Points are measured from multiple approach directions. The average point and the deviation of each point to the average center are calculated. The result is the maximum range divided by two.

2 The Volumetric Accuracy Test is the most representative test for volume measurement accuracy. A gage block with a known and certified length is measured several times throughout the working volume. This gage block is installed in different positions and measured depending on multiple approach directions. The result is the maximum deviation of the measuring distance less the theoretical length.

Ambient conditions:

  • Working temperature: 0°C – 50°C (32°F – 122°F)
  • Storage temperature: -30° -70° C (-22°F – 158°F)
  • Relative humidity: 10% – 90% non-condensing
  • Operational elevation: 0-2000 m (0-6600 ft)

Marks of conformity:

  • CE Compliance: Yes

Power requirement:

  • Universal worldwide voltage 110V-240V

All probing specifications are achieved with a ROMER Absolute Arm mounted on a ROMER base plate or magnetic base and using a 15 mm steel ball probe with a length of 50 mm under stable environmental conditions.

All CMS 108 scanning specifications are achieved with a ROMER Absolute Arm mounted on a ROMER base plate or magnetic base and using CMS 108 zoom setting 2A (mid range scan width 60 mm and point spacing 0.03 mm) and a matte grey calibration sphere 25.4mm diameter under stable environmental conditions.

All RS1 scanning specifications are achieved with a ROMER Absolute Arm mounted on a ROMER base plate or magnetic base and a matte grey calibration sphere of 25.4 mm diameter under stable environmental conditions.

ROMER is the industry leader in portable CMM arms, and Exact Metrology offers a wide variety of sizes ranging from 2 meters up to 4.5 meters. Every ROMER articulated arm is manufactured from carbon fiber, which makes them extremely lightweight and portable. The carbon fiber also ensures that accuracy can be held over a large temperature range. The new Absolute arm features proprietary encoders that eliminate the need to home the arm on startup.  It’s simple: if the arm is on, it is ready to operate. The ROMER 6 axis hard probing arm has the ability to run on battery and WiFi, eliminating cables on the shop floor. An operator can use the arm on the shop floor to perform inspections, machine setups, and fixture builds. A person can quickly measure their parts and get immediate feedback of in and out of tolerance conditions. ROMER arms can also be utilized by your inspection team to perform full 1st Article inspections using many different software packages. The Romer 7 axis hard probing and laser scanning arm offer the same shop floor ready hard probes as the 6 axis arms, but also add a 3D non-contact laser scanner. The first option is the brand new, 1st of its kind, fully integrated laser scanning system from ROMER. This means that the scanner is fully integrated directly into the wrist of the arm and has been certified as one unit using B89 standards. With this scanner, you can capture complex geometry at speeds of 30,000 points per second. Our second option is a 3rd party external 3D scanner that mounts on the traditional 7 axis arms. This scanner utilizes internal cabling, but gives the option to switch them between multiple devices including other ROMER arms and conventional CMM’s. With these external scanners, data can be captured at rates ranging from 23,000 pts/second up to 458,000 pts/second.


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