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By measuring these artefacts it is possible to assess according to which criteria a given CMM siftware evaluates Form and Position Tolerances (GD&T). With other words: whether a software works according to the standardized GD&T principles.

For example one would get to know whether a CMM software package works with tangential elements or it works only with Gaussian Elements and one would need to establish conformity with ISO standards by certain workarounds.

Together with each software test artefact comes a documentation with the diverse reference solutions one would get from the evaluaion according to prevailing  standards and as well according to traditional, often used criteria which are not 100% in conformity with standards. One can often judge from the results how the given CMM software works, and then think about workarounds for the daily use of this CMM software in order to produce results which are in conformity with the standards.

Often such workarounds consist in only few additional steps, as for example "shift a reference plane by half the form error".

Many software packages allow to verify form and position tolerances in conformity with standrds, but one needs to know exactly how to do this programming and there is no feed back whether one has done it right. With the new artefacts allow the measurment technician to demonstrate in a simple way that he is doing it right ... or needs to correct one´s strategy.

Trapet Precision has recently launched two software test artefacts.

1. Reference elements on prismatic parts (existing)

2. Reference elements on rotationally symmetric parts (in work)

3. Maximum Material Principle (planned)

These artefacts may be bought with calibration. Calibrations are performed by an ISO 17025 accredited laboratory.

For the calibrated values such reference solutions are supplied. If the artefacts are ordered "uncalibrated", then reference solutions are supplied for the "nominal systematic deviations".

Please note that the inbuilt systematic deviations are big, so that basic information about the functionality of one´s evaluation software platform and one´s proper (or improper) use of this software can be obtained. As well for training purposes, uncalibrated objects might be sufficient. We believe that these artefacts are a great help for training in GD&T.