Chen P.-Y.Huang H.-L.Jywe W.-Y.Wang M.-S.Wen-Yuh Jywe2022-05-242022-05-242019https://www.scopus.com/inward/record.uri?eid=2-s2.0-85091043957&partnerID=40&md5=a6214fedc04845c0b909dfedb7896cfbhttps://scholars.lib.ntu.edu.tw/handle/123456789/611900Based on the theory of laser measurement, this work presents a novel optical rotary-axis angular errors calibrator to measure the angular positioning errors of a multi-axis machine tool. The proposed calibrator integrates a laser-based angular measuring system and a high accuracy rotary stage. The control method of the optical rotary-axis angular errors calibrator is based on autofocusing technology. Additionally, based on the quadrant detector (QD) of the laser-based angular measuring system, the angular positioning signal is detected from the indexing table. Moreover, an angular position for autofocusing the laser spot at QD is provided using the high accuracy rotary stage. The proposed optical rotary-axis angular errors calibrator is verified using commercial instrument autocollimator and laser interferometer. Experimental results indicate that the proposed optical rotary-axis angular errors calibrator detects the angular positioning with an accuracy of approximately ±1 arcsec. Furthermore, the angular accuracy of a multi-axis machine tool can be adjusted within ±1 arcsec, based on the indexing resolution of 0.0001°. ? 2019, Chinese Mechanical Engineering Society. All right reserved.Automatic indexingIndexing (of information)InterferometersLaser interferometryLaser theoryMachine toolsAngular positioningAngular positionsCommercial instrumentsLaser interferometerLaser measurementsMeasuring systemsMulti-axis machine toolQuadrant detectorsInstrument errorsjournal article2-s2.0-85091043957