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Basics of Coordinate Metrology
Unit 9: Preparing the Measurement - Environmental effects

Step 4 of 7
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The coordinate measuring machine and the part are always subject to environmental effects. Two of them have already been discussed on the previous page: The effect of temperature and contamination/dust.

There is, however, a whole array of other effects. A few of the most important ones are listed below:

  
Light rays: Avoid direct sunlight shining on the CMM and the part, since this leads to temperature differences and thus to greater measuring uncertainty. Humidity: High humidity leads to warping, for example of the natural hard granite plate of the CMM and - depending on the material - also to warping of the part. Here, too, you should proceed with extreme care, since otherwise the measuring results will soon become unusable. In addition, humidity causes rust in steel parts, including those in the CMM!
Floor vibrations: Floor vibrations also lead directly to falsified measuring results. Measurements must be repeated if floor vibrations (for example caused by tremors) have taken place during the measurement. Sound waves: Noise produces sound waves. They affect in particular the stylus tips and the test object (part). This is why noise also affects the measuring result and the measuring uncertainty.