Portable Measuring Arms Provide Freedom

Feb. 27, 2020

For the first time, LK Metrology is diversifying into the supply of 3D articulating arm metrology systems with the launch of a range of 24 portable measuring arms called FREEDOM.


There is a 6-axis model for touch probing and a 7-axis version for multi-sensor metrology including laser scanning. Both are available in two accuracy levels and the four products come in six sizes with a reach of up to5 m (196.85 in.).


The two 6-axis arms for tactile inspection are named FREEDOM classic and FREEDOM select, the former being the entry-level model and the latter the enhanced accuracy version which is supplied with a calibration bar. The addition of an extra degree of freedom provides infinite movement and enables laser scanning with a Nikon Metrology ModelMaker H120, MMDx100 or MMDx200. These 7-axis arms, again in two accuracy versions, are called FREEDOM classic scan and FREEDOM select scan. The touch probing accuracy of all FREEDOM arms is certified to ISO 10360-12 before delivery and may be supplied with a variety of aluminum and carbon fiber probe kits, styli, mounting rings including some with a magnetic or vacuum base, tripods, rolling stands, and carts with a granite top.


Carbon fiber tubular construction ensures stability under challenging conditions. Infinite rotation and a proprietary counterbalance make manual movement light, which promotes ease of use even when trying to access awkward areas of a component. Wi-Fi connectivity and battery power allow completely portable wireless touch probing for maximum flexibility. The arm can be stowed and locked in place between measurements and when it is being relocated. Even the largest FREEDOM arm model weighs less than 11 kg (24.25 lb.), making set-up and repositioning quick and easy.


A notable feature of the arms is the inclusion of absolute rather than incremental rotary encoders to feedback the angular position of every joint to the control software. The equipment may, therefore, be used immediately on start-up, avoiding the need to calibrate the probe before use every time. This raises productivity, as does the highly repeatable probe connection that allows them to be swapped quickly without interrupting the measuring process to recalibrate. Contributing also to efficiency and convenience is an LCD display with a quick-access menu on the probe wrist, putting the most useful information directly in the hands of the operator during measurement.


A strong line-up of third-party inspection software can be supplied by LK Metrology with its new FREEDOM arms, including InnovMetric's PolyWorks Inspector that has the ability to swap programs seamlessly between portable and static CMM platforms. ArcoCAD metrology software from Metrostaff is also available, as is Nikon Metrology's Focus Inspection for data acquisition and analysis, while the latter's CMM Manager inspection package may be used for touch probing only.