P2.18 Characterization of the single point precision of steel gear wheel measurements using tactile coordinate measurement machines in scanning mode

Abstract

The framework of the single point uncertainty developed at the Institute of Manufacturing Metrology (FMT) presents a methodology to determine and evaluate the local measurement uncertainty for a measurement setup by local comparison of a measurement series with an associated reference geometry. This approach, which was originally developed and optimized for the processing of complete areal measurements of work pieces, was now also extended to line scans found in dimensional testing using tactile coordinate measurement machines (CMM). Target of the investigation are straight-toothed steel gear wheels, which can be dimensionally characterized by both helix and profile scans using a CMM in scanning mode in combination with a rotatory stage. The modification of the single point uncertainty framework in order to determine the single point precision of repeated gear wheel measurements was implemented successfully but the test setup also yielded abnormally high random measurement errors, which could not fully be explained within our examinations.