How to Minimize the Dynamic Error of CMM

Perceptron, Inc. (Plymouth, MI) has launched a full range of 5-axis coordinate measuring machines that are complete with the revolutionary REVO-2 scanning probe from Renishaw® Inc. (Hoffman Estates, IL) and a fully-integrated UCC CMM controller and MODUS® metrology software.

“By combining the metrology stability of the COORD3 Universal CMM with the latest REVO-2 5-axis measuring system, CMM dynamic error is minimized for high-speed probe motion since all part feature scanning motion is within the REVO-2 head,” explains Elliott Mills, the CMM product sales director for Perceptron. “The REVO-2 is the only scanning system for CMMs that simultaneously controls the motion of three CMM and two probe head axes, while collecting workpiece data using its range of 3D tactile probes, surface roughness measurement probe and non-contact vision probe. It uses laser measurement for precise workpiece measurement at extremely high rates of data capture. Scanning rates of 500 mm/sec can now be achieved that are 20 times faster than traditional 3-axis scanning CMMs.”

The Universal CMMs utilize a high-technology alloy moving frame design that provides the benchmark for dynamics and measuring accuracy performance. This design overcomes the issues associated with operating traditional build CMM structures, in the typical, less than perfect, CMM operating environments. A CMM thermal compensation system of both machine and part, allows the measuring system to automatically and dynamically compensate for changes in the CMM operating environment. This system allows the CMM to perform with stated measuring accuracy between 16 deg C and 26 deg C. Gold-plated 0.1 µm measuring scales are free-floating in support tracks, eliminating any CMM structural changes from influencing its measuring accuracy.

Universal CMMs have a very efficient design in terms of machine simplicity which improves long-term reliability and ultimately cost of CMM ownership. The COORD3 Universal CMMs have an isostatic design for each axis that provides optimum machine geometrical alignment in the construction of the machine, which ultimately benefits the ability to make accurate field calibrations. Universal has a monolithic base-plate, with integral inverted dovetail guide-way, and a generous 90 mm (3.5 in.) x 90 mm (3.5 in.) Z Ram section providing outstanding metrological performances. Direct axis drives, using toothed drive belts, provide the vibration-free motion with zero hysteresis.

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Universal CMMs can also be equipped with an optional SZP (Safety Zone Protection System) which uses laser scanners to monitor the defined protection zone when the CMM is in high speed automatic measuring mode. SZP reduces the CMM speed upon infringement of the safety zone by an operator and automatically returns the CMM to its full measuring speed, only after the zone infringement has been cleared. The SZP system allows safe use of the CMM in a production, shop-floor and fully-automated applications.

The COORD3 Universal CMM range accommodates part sizes up to 3000 mm x 1500 mm x 1200 mm. COORD3 has already supplied 5-axis CMMs to several  North American aerospace manufacturing companies.

Perceptron, Inc., 47827 Halyard Drive, Plymouth, MI 48170, 734-414-6100,                         [email protected], www.perceptron.com.