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The Ultimate Guide - Operation Steps of VMG CNC Video Measuring System Before starting the VMG CNC Video Measuring System, it is essential to comprehensively and thoroughly master all safety precautions. This is a crucial prerequisite for ensuring the smooth progress of the operation and safeguarding the safety of personnel and equipment. Next, please strictly follow the following steps in an orderly manner: Pre - operation Preparation: First, select a marble workbench with sufficient rigidity and flatness, and keep it away from strong vibration sources and electromagnetic interference sources such as large - scale servo motors and stamping equipment. Because if the workbench vibrates or displaces, Abbe error will occur during the measurement process, seriously affecting the accuracy of the measurement data. Carefully place the workpiece to be measured on the high - precision granite workbench of the instrument. Use a surface roughness tester to detect the surface of the workpiece to ensure that the Ra value of the surface roughness meets the measurement requirements. If there are impurities such as dust and oil stains, clean them with anhydrous ethanol and a dust - free cloth. According to the geometric shape and dimensional tolerance of the workpiece, select suitable high - precision vices, magnetic chucks or special fixture jigs, and firmly fix the workpiece through the six - point positioning principle to prevent rigid - body displacement and small - scale deformation during the measurement process. Power - on and System Initialization: Connect the AC220V power supply of the measuring system and press the start button with a self - locking function. At this time, patiently wait for the instrument to complete the comprehensive self - check procedure. During the self - check process, the instrument will automatically conduct functional tests on key components such as the optical zoom lens, XY - axis linear motors, grating scale displacement sensors, and image acquisition cards. After the self - check is completed, perform the system initialization operation. Adjust the object distance of the lens to the initial working distance, return the Cartesian coordinate system of the workbench to the mechanical origin through the zero - setting operation, and at the same time, initialize the measurement software of the measuring system and load the default measurement parameter group. Measurement Parameter Setting: According to the dimensional accuracy requirements, shape complexity, and measurement feature elements of the workpiece, accurately set the relevant measurement parameters. This includes measurement resolution, measurement uncertainty, sub - pixel edge extraction accuracy, image acquisition frame rate, etc. For example, for the measurement of precision parts with a shape and position tolerance requirement within ±0.001mm, the measurement resolution should be set to 0.1μm, and the sub - pixel edge extraction accuracy should be set to 0.01 pixels. For large - sized sheet metal parts, the measurement range should be reasonably expanded according to their contour dimensions, and at the same time, the image acquisition frame rate should be appropriately reduced to ensure the image quality. When setting parameters, refer to the instrument operation manual and relevant national standards, such as GB/T 16901.1 - 2008 "Rules for the representation of graphical symbols - Part 1: General principles", to ensure that the parameter setting is scientific and reasonable. Focusing and Measurement Point Positioning: Operate the manual fine - tuning knob of the measuring system, and use the Koehler illumination principle to focus the lens to make the detailed features of the workpiece surface clearly imaged on the high - resolution display screen. During the focusing process, follow the principle of coarse - tuning first and then fine - tuning, and adjust slowly and carefully to avoid missing the best focal plane due to too fast adjustment. After focusing is completed, use the CNC handle of the workbench or the movement control button in the measurement software to accurately position the measurement point to the measured part of the workpiece according to the rectangular coordinate positioning method. During the positioning process, with the help of the image pre - processing functions of the measurement software, such as gray - scale stretching and median filtering, enhance the image contrast to ensure the accurate position of the measurement point. Measurement Execution: After confirming that the parameter setting is correct and the measurement point is accurately positioned, press the measurement trigger button. The measuring system will automatically collect images based on the machine vision principle and use mathematical algorithms such as edge - detection algorithms and least - squares fitting to measure and calculate the geometric parameters such as the size, shape, and position of the workpiece. During the measurement process, keep the instrument and the surrounding environment quiet and stable to avoid measurement result drift caused by external factors such as environmental vibration and temperature changes. After the measurement is completed, check the measurement data displayed on the display screen. If there are doubts about the repeatability and accuracy of the data, repeat the measurement 3 - 5 times according to statistical principles, and take the arithmetic mean of the measurement data as the final measurement result. Data Processing and Report Generation: Import the measured data into the data analysis module of the measurement software and use statistical methods for analysis and processing, such as calculating the standard deviation and coefficient of variation, to evaluate the dispersion degree and reliability of the measurement data. For the situation where a measurement report needs to be issued, use the report generation template provided by the instrument to generate a detailed measurement report in accordance with the format specified in ISO 17025 "General requirements for the competence of testing and calibration laboratories". The report should include information such as the workpiece name, drawing number, measurement date, measurement equipment number, measurement data, measurement uncertainty evaluation, and the signature of the measurement personnel. Power - off and Equipment Maintenance: After all measurement work is completed, first perform the operations of saving data and exiting the program in the measurement software, and then press the power - off button to turn off the power supply of the instrument. Use lens paper and special cleaning fluid to clean and maintain the optical lens to prevent dust and oil stains from adhering and affecting the imaging quality. Wipe the workbench and the surface of the instrument with a clean soft cloth dipped in an appropriate amount of rust - preventive agent, and clean up metal debris and other sundries generated during the measurement process to prepare for the next use. At the same time, regularly calibrate and maintain the accuracy of the instrument to ensure that it is always in good working condition. |