Since the first Lotus car was built in 1948, the company has been a beacon in the automotive industry for the design and manufacture of high-performance cars born out of success on the racetrack. The latest sports car, the Emira, is by far the most accurate model ever built by Lotus thanks to an upgrade in quality control at the company’s factory in Hethel, Norfolk. The upgrade includes investment in a five-axis HC-90TR twin-arm CMM manufactured in the UK by LK Metrology. This automated, multi-sensor inspection cell, part of multi-million pound investments made by Lotus since 2017, delivers absolute, 100%, non-contact dimensional inspection at production line speed, enabling real-time quality control.

The CMM is set 1 m into the floor on a special foundation. This configuration means that a car for inspection carried on an automated guided vehicle (AGV) can access the area without the need for any lifting equipment. The machine has a measuring volume of nominally 6.3 x 1.6 x 2.5 m, easily large enough to contain an entire car body.

Triple-laser cross scanners are deployed on both arms to measure features automatically on both sides of the Lotus Emira simultaneously. LK says that the HC-90 is the world’s most accurate range of horizontal-arm CMMs, able to measure to a volumetric accuracy of 10.0 μm + L/200 and with 6 μm repeatability. The machine combines the high performance of a bridge-type CMM with the flexibility of the horizontal-arm configuration widely used in car plants.

The CMM completes automated measuring cycles so quickly that it can keep up with the quick TAKT time that defines the speed of the Emira production line.
For further information www.lkmetrology.com