How can you define the reliability of a measuring machine? What constitutes to the reliability of a measuring machine? We believe there are two main components. The first is the continuous accuracy of the measuring machine. The second is the availability of the measuring machine.
Think about what an accurate measuring machine is worth if it suddenly breaks down during an important measurement task?
Just think about what a measuring machine is worth if a post-measurement customer complaint points out incorrect measurements have been taken, and who knows for how long.
Without the slightest exaggeration, at that point the value of the measuring machine is close to zero.
But what can be done to avoid such unwanted cases? The key is cyclic calibration and planned preventive maintenance.
Every measuring machine contains typical mechanical parts that are subject to wear and tear. During maintenances we replace these parts. Moreover, we carry out the maintenance and diagnostic procedures and all necessary settings and adjustments based on the manufacturer’s specifications.
Coordinate measuring technology provides essential support for quality assurance. In our case, the quality of the finished product is determined by its complience to the geometric specifications. It is therefore essential, that the inspection of these quality features are performed reliably, and thus, the quality of the measurements must be ensured. This basic requirement is part of every quality management requirement system like: ISO9001, ISO/TS16949, VDA or QS9000. To put it simply, the accuracy of the measuring equipment must be controlled and tracked. This is what cyclic calibration is for.
But what does calibration mean?
According to the International Vocabulary of Metrology:
“6.11. Operation that, under specified conditions, establishes a relation between the quantity values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties and uses this information to establish a relation for obtaining a measurement result from an indication.”
Simply put: The result displaying error of the device with the aid of an etalon.
Since co-ordinate measuring machines are equipped with advanced computer systems, errors of the measuring machines via software is possible This increases the accuracy, but it is by no means simple. To understand the depth of the problem, imagine what errors can occur in the case of a plain and simple calliper. It is easy to see then that a 3D coordinate measuring machine is the source of a high number of error.
Manufacturers keep the mathematical fundamentals and techniques of their correction systems as top secret. Being the exclusive Hungarian distributor of these companies, Werth Magyarország Kft. has exclusive access to these formulae and thus can carry out the error mapping and also perform the necessary corrections of the machines.