Координатно-измерительные машины HEXAGON LEITZ PMM-F, PMM-G - страница 3

MAKE THE RIGHT CHOICE INCREASE THROUGHPUT The bases of economic success are products which are The ratio of the standard deviation to the tolerance (s/T) is produced cost effectively and in optimized processes. critical. Measuring device capability: The manufacturing costs of products are influenced by the Cp =  0.2 * T  ≥  1.33 gives s 0.2 * 10 µm production costs as well as by the reworking and rejection costs. 4*s 4 * 1.33 With that, the costs for quality assurance are a decisive factor for the selection of the correct coordinate measuring machine. s = 0.38 µm T = smallest tolerance to be measured, e.g. 10 µm The economic laws of measuring technology Cp = Measuring device capability index for testing devices, e.g. The decision as to whether a part is rejected or not is highly Cp ≥ 1.33 reliant on the measurement uncertainty of the process. What is required is a coordinate measuring machine with a Leitz brand high-precision coordinate measuring machines measurement uncertainty as small as possible. from Hexagon Metrology ensure small, reproducible How big should a measurement uncertainty actually be? In order measurement results in the measuring room and in production, to answer this question, the tolerance that has to be checked enabling you to make the right decisions in the production and must be taken into consideration. With this in mind, a Directive testing processes. of the Association of the German Automotive industry says: »The capability of the measuring device is determined by the ratio of Throughput and return on investment its measurement uncertainty to the tolerance.« This expert panel Apart from the measurement accuracy, short measurement requires that the uncertainty of the testing process should only cycle times and high throughput are a necessity to satisfy the be one-tenth to one-fifth of the feature tolerance. requirements of production. Selecting a measurement uncertainty that is as small as Important specifications for a CMM to guarantee maximum possible gives the production a greater scope for the exploitation possible throughput and low testing costs are: of the permissible component tolerances. - High probing frequencies - Fast axis accelerations - Fast movement speeds - Variable High-Speed-Scanning (VHSS) Costs Customer benefits Initial investment 1. year 2. year 3. year 4. year 5. year Conventional CMM Leitz High Accuracy CMM  Reliable testing decisions for production  High measurement throughput  Machine structures stable over the long term   High availability LEITZ PMM-F / PMM-G | XXL-Class CMMs and Gear Inspection Centers 3