Three-probes roundness measurement and spindle error separation

• Main Authors: Tz-Fu Huang, 黃梓輔
• Other Authors: Ji-Chun Lee
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/76766995088770816292

碩士 === 中興大學 === 機械工程學系所 === 95 === This research set up a roundness measurement machine and discuss error analysis. They have some factors to influence measurement results which are probe mounting error and spindle error. Probe mounting error includes both probe deviation and center misalignment. Spindle error can be divide into two parts. Those are tilt of the spindle and two-dimensional spindle motion. In this experiment, the tilt of spindle is reduced by constraining the spindle at its two extremities with bearings. We consider the probe mounting error and the two-dimensional spindle motion only in our approach. We present an exact geometric model while consider the radius of the probe. Finally, the simulate results are demonstrated. In the experiment, we set up a roundness measurement system and used the three-probe method to separate the two-dimensional spindle radial error motion. We arrange probes properly to reduce imperfection of the transfer function. Finally we compute the least squares roundness of a cylindrical workpiece. We measure the roundness of this cylindrical workpiece five times to verify the repeatability of our system.