Vpliv števila merilnih točk na natančnost meritve s trikoordinatnim merilnim strojem

Mihelič, Nejc (author), Lebar, Andrej (mentor), Valentinčič, Joško (co-mentor)

Pri meritvah na koordinatnem merilnem stroju imata strategija vzorčenja in izbrano število merilnih točk velik vpliv na rezultat meritve. V nalogi smo obravnavali slepo strategijo vzorčenja in izvedli meritve premera, razdalje, ravnosti, krožnosti, oblike valja, pravokotnosti, vzporednosti, preprostega teka, popolnega teka ter koncentričnosti in soosnosti. Nominalne vrednosti merjencev smo pridobili z izvedbo vsake od meritev, katere so vsebovale 150 merilnih točk. Nato smo izvedli meritve z različnim številom točk in ugotovili, da se optimalno število merilnih točk glede na potreben čas meritve in natančnost meritve sicer razlikuje glede na merjeni geometrijski element oziroma merjeno geometrijsko toleranco. V splošnem lahko rečemo, da 10 je merilnih točk optimalno število merilnih točk ob uporabi slepe strategije vzorčenja.

• Language: Slovenian
• Keywords: meritve, koordinatni merilni stroji, število merilnih točk, strategija vzorčenja, ravnost, krožnost, oblika valja, pravokotnost, vzporednost, preprosti tek, popolni tek, koncentričnost in soosnost
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [N. Mihelič]
• Year: 2019
• Number of pages: XXIV, 63 str.
• PID: 20.500.12556/RUL-109758
• UDC: 531.714:519.6(043.2)
• COBISS.SI-ID: 16877339
• Publication date in RUL: 08.09.2019

Secondary language

• Language: English
• Title: Number of measurement points and measurement accuracy on coordinate measuring machine

Abstract

Sampling strategy and sampling size have major influence on the measurement result. In the paper, we addressed a blind sampling strategy and performed measurements of diameter, distance, flatness, circularity, cylindricity, perpendicularity, parallelism, circular runout, total runout, concentricity and coaxiality. The nominal values of measured pieces were obtained by performing each measurement which contained 150 measuring points. Afterwards, various numbers of measuring points were inserted for each measurement and we found out that the optimal number of sampling size varies for each measured feature based on consumed time and accuracy. We could conclude that 10 measuring points is the optimal number of sampling size if blind strategy is used.

• Keywords: measurements, coordinate measuring machines, number of measurement points, sampling strategy, flatness, circularity, cylindricity, perpendicularity, parallelism, circular runout, total runout, concentricity and coaxiality