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Advanced metrology for machine tool

MT and CMM verification and volumetric compensation

The measuring system based in Laser Tracker and Laser Tracer is a high precision method that allows the spatial position and orientation of automated positioning systems of MTs or CMMs to be measured and corrected by using multiple distance readings alone.

At the International Machine-tool Biennial, due to take place at the BEC in Barakaldo (Basque Country) from 2 to 7 June, IK4-TEKNIKER will be showcasing the advanced technology it uses in its Verification and Volumetric Compensation Service for industrial companies.

The Basque R&D centre’s metrology service is collaborating closely with large international companies which are a benchmark in the metrology sector, the German companies Zeiss and Etalon.

Both Machine Tools (MT) and Coordinate-Measuring Machines (CMM) inevitably display intrinsic deviations that are the result of the inaccurate manufacturing of the machine’s components, wear of the functional parts (play), error in reading of the scales, as well as elastic deformations of the structure, etc.

These geometric inaccuracies affect precision in the positioning and orientation of the machine and, as a result, the accuracy in the use of them. So it is very important to be able to measure and correct these geometric deviations in order to optimize the capacities (manufacturing, measuring) of systems of this type.

Innovative methods

Measuring techniques that allow the geometrical errors of the machine in the various axes to be independently characterised were used in the past. These methods not only prolong the machine's verification times, they do not always adapt properly to current verification needs and are limited when it comes to determining the volumetric errors of the machines, mainly due to their dimensions.

The coordinating measuring machine and machine tool verification service by means of Laser Tracker-based and Laser Tracer technologies is a high precision method that allows the spatial position and orientation of automated positioning systems of MTs or CMMs to be measured and corrected by using multiple distance readings alone.

A sequential or real-time verification can be carried out by combining the measuring of various pieces of measuring equipment.

This service, which is being offered by IK4-TEKNIKER, has come about to address the demand of market requirements, like large-sized parts, narrower manufacturing tolerances and higher-performance machines. It also addresses the current ISO 10360-2, ISO-230-2 standards.