Influence of Probing System Configuration and Sampling Strategy on Roundness and Cylindricity Measurements Using a Coordinate Measuring Machine

Coordinate measuring machines (CMMs) report sampling-dependent estimates of geometric form. This secondary, exploratory reanalysis examines individual exported results from six drilled cylindrical features documented in a 2025 diploma thesis, with two probing heads and sampling levels of 5, 20 and 100 points per circular section. Historical ANOVA summaries, a Holm sensitivity analysis and exploratory Kruskal–Wallis comparisons consistently identify sampling density as the most recurrent association with the evaluated roundness and cylindricity. These statistical results are not confirmatory: the reduced, partly confounded design lacks independent replications of exact measurement configurations, while repeated observations concern the same physical features. Newly consolidated absolute and relative contrasts quantify the scale and feature dependence of the reported changes, and machine-readable data expose the underlying configurations and documentation limitations. Comparison with Talyrond reference results remains descriptive because equivalence of evaluation operators and a combined task-specific uncertainty have not been established. The contribution is therefore a transparent, reproducible reassessment of how inspection choices affect reported CMM form values, not an independent causal demonstration or proof of improved measurement accuracy.