A Roundness Machine Measuring Probe Calibration – Jiri Vit, Martin Novak

Abstract

The article deals with the research of the measuring probe signal of roundness machine Roundscan of Jenoptik
IM producer. The probe of this machine scans geometric form as well as surface structure. The probe signal dependence
on the probe arm elevation is not perfect linear and this influences the precision of evaluated form characteristics,
roughness parameters as well as drall parameters. A quantification of calibration way influence on the
signal characteristic was main research task. A calibration process simulator was designed and built in MATLAB
for this. This article describes a way of obtaining of real probe signal. Metrological filters according current standards
ISO 16610- 21 and ISO 16610-22 were built in MATLAB for obtained signal filtering. The calibrating simulator
simulated various master standard values, various probe arm starting positions before the calibration, various
probe arm starting positions before subsequent common measurement, and tolerance limit utilisation during
a master standard value transmission to the probe signal. An efficiency of signal linearization procedure was explored,
as well. Obtained results are presented as signal zones, which delimit assigned signal deviations from perfect
signal characteristic.