Abstract
A method for measuring shaft diameters is presented using structured light vision measurement. After calibrating a model of the structured light measurement, a virtual plane is established perpendicular to the measured shaft axis and the image of the light stripe on the shaft is projected to the virtual plane. On the virtual plane, the center of the measured shaft is determined by fitting the projected image under the geometrical constraints of the light stripe, and the shaft diameter is measured by the determined center and the projected image. Experiments evaluated the measuring accuracy of the method and the effects of some factors on the measurement are analyzed.
Highlights
Shafts are one of most important machine elements and the accuracy of machined shafts has a significant effect on the properties of any mechanical device that employs one
If the variation of the shaft diameter could be monitored during its machining, the dimensional accuracy of the product could be ensured by the automatic compensation system of the CNC lathe
If the line-structured light is perpendicular to the measured shaft, the shaft diameter can be obtained by fitting a circle
Summary
Shafts are one of most important machine elements and the accuracy of machined shafts has a significant effect on the properties of any mechanical device that employs one. Proposed a method where both edges of a shaft were imaged onto two cameras through two parallel light paths as shown in Figure 1 [8] Using this approach, the shaft diameter was obtained by measuring the length of the photosensitive units on the shadow field of the two CCDs (Charge-Coupled Device) and the distance between the two parallel light paths. In 2013, Sun [9] used a camera to obtain shaft diameters, employing a theory of plane geometry in the cross-section, which is perpendicular to the axis of the shaft, as shown in Figure 2 [9] This method can achieve a high measuring accuracy, but it requires the calibration of the plane of the center line of the shaft before the measurement. If the line-structured light is perpendicular to the measured shaft, the shaft diameter can be obtained by fitting a circle This method is limited by the measurement environment.
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