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

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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 * 1.33 4 * s
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 technologyCp = Measuring device capability index for testing devices, e.g.
The decision as to whether a part is rejected or not is highlyCp ≥ 1.33
reliant on the measurement uncertainty of the process.
What is required is a coordinate measuring machine with aLeitz 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 ordermeasurement results in the measuring room and in production,
to answer this question, the tolerance that has to be checkedenabling you to make the right decisions in the production and
must be taken into consideration. With this in mind, a Directivetesting processes.
of the Association of the German Automotive industry says: »The
capability of the measuring device is determined by the ratio ofThroughput and return on investment
its measurement uncertainty to the tolerance.« This expert panelApart from the measurement accuracy, short measurement
requires that the uncertainty of the testing process should onlycycle 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 asImportant specifications for a CMM to guarantee maximum
possible gives the production a greater scope for the exploitationpossible 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