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Shop Floor CNC CMM with Delta Mechanism

Shop Floor CNC CMM with Delta Mechanism Extol 370 / 520 - Shop Floor CNC CMM Aberlink CMM Series


Extol Shop Floor CNC CMM
Coordinate Metrology ‘Comes of Age’ To Pace Production

Metrology News recently visited British CMM manufacturer Aberlink, renowned for its design innovations, to witness the physical launch of EXTOL, the world’s first CMM to utilize the delta mechanism.

Located in a quintessentially English Cotswold country-side location, with close by neighbors of Renishaw and Dyson, innovation seems to be in the country air in these parts. Celebrating 27 years of business, Aberlink exports over 70% of its CMM production to all regions of the world.

The delta mechanism is a common platform found in both robotics and 3D printer markets but, until now, has not ventured into the more traditional world of coordinate measuring machines.

Designed for robustness and reliability, the Extol CMM can operate 24/7, making it ideal for production floor measurements whether, adjacent to a machine tool, in a manufacturing cell, or in a dedicated inspection area.

At a price not much more that the cost of a motorized probe head, on a traditional cartesian bridge CMM, the EXTOL has been developed to deliver affordable coordinate metrology right at the point of production.

Ergonomics of the new EXTOL CMM were a significant factor during the machine design process, ensuring the CMM is not only quick and easy to perform one-off inspections, but also has ample access for either batch inspection or to facilitate automatic part loading by robot or transportation system. The EXTOL can be positioned exactly where measurements are needed – on the production floor.

Five temperature sensors, monitoring both the machine and ambient temperatures, ensure the EXTOL is capable of operating in uncontrolled manufacturing environments reporting measurements as though they had been performed at 20oC. The software warns should the rate of temperature change become greater than that typically conducive with reasonable metrology practice.

Thinking Outside The Box

The EXTOL delta design mechanism, delivers a cylindrical measuring volume of 370 mm (14.5″) diameter x 270 mm (10.6″) in height rather that the traditional orthogonal box measuring volume. The EXTOL’s, compact footprint, performs with a measuring accuracy of 2.6 + 0.4L/100 μm, incorporates 0.1 μm resolution scales, and has a more than ample granite table payload of 200 kg. Vertically mounted machine-tool linear guide-ways provide the measuring platform motion via thermally inert carbon fiber struts.

Delta mechanisms are renowned for their repeatable motion with high acceleration and speed. The Extol CMM delivers with maximum vector speeds of 500mm/sec and maximum vector accelerations of 750mm/sec².

Automatic tool offset correction for CNC machine-tools is available with the Aberlink 3D software, which compliments the manufacturing-floor attributes of the EXTOL perfectly, allowing for its utilization as part of a fully automated production process, in the midst of a manufacturing environment, providing closed-loop process control.

Robust, accurate and reliable, the EXTOL CMM is the perfect solution to automatically verify part quality of critical components. In addition EXTOL offers:

  • Sealed recirculating machine-tool proven bearings providing smooth motion and contamination immunity
  • Directly coupled belt-drive system eliminates need for a gearbox and associated backlash issues
  • Super-smooth motion enable long styli to be used without suffering vibration initiated false probe triggering
  • Long-life strain gauge technology touch-probe with no lobing characteristics ( RenishawTP200B)

 

 
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