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FARO® Knowledge Base

Temperature Compensation and How Is It Used with the FaroArm and Measure

The temperature of the object being measured does not need to be set for probe calibration. There are temperature sensors in the FaroArm that will compensate for the contraction/expansion of the FaroArm. The FaroArm will always measure the part at it's actual size regardless of the temperature (in the 10 to 40 C range of the arm). The temperature compensation in Measure is used to address the contraction/expansion of the part since it will measure larger than design if it's hot and smaller than design if it is cold.

Temperature compensation for measurements should be set in the Device Position (if used). It is also part of the Alignment process, but doesn't work as effectively if you have multiple Move Device commands. If you set the temperature to 2000 C and measure a 20 mm hole it will modify the XYZ location and shrink the diameter by a factor of the expansion coefficient and the temperature difference (2000 C to 20 C). It does not affect the CAD model, only the measurements and constructions. Nominal data does not change.

Temperature compensation should be used when the part is very large and the tolerances are tight (i.e. most laser tracker applications). With a FaroArm the temperature probably won't affect the part enough to make much of a difference.

Keywords:

compensation, temperature, temp, comp temperature compensation,CAM2