positive displacement meter|sdnand sdnand|vortex flow meter

Flow Meters – Silver Automation Instruments

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1. Talk about the calibration of CNC machine tools

Talk about the calibration of CNC machine tools. CNC machine tools need to undergo corresponding accuracy calibration after new purchase, use for a period of time, and maintenance. When quality issues need to be seriously considered, calibration and compensation will directly affect cycle time. A machine tool within the precision index range can work at high speed while maintaining machining accuracy. Calibration allows for online detection of workpieces, saving time for the workpiece to move back and forth between the machine tool and the coordinate measuring machine. In addition, regular calibration can also be used to predict whether the machine tool is about to deviate from the accuracy index. Previously, operating laser calibration instruments required professional metrologists. It is necessary to open the machine cover so that optical components can be adjusted on the worktable, spindle, and independent tripod. The process of spatial calibration takes several days, depending on the size of the machine tool. Therefore, when the workpiece is measured within the tolerance range by a coordinate measuring machine, spatial calibration becomes less necessary. With the advancement of technology, the cost of laser calibration equipment has been greatly reduced. For example, products from Optodyne in the United States do not require professional metrology personnel or external services, and machine downtime has also been greatly reduced. A mechanic who has received one day of laser calibration training can complete a spatial measurement of 1 cubic meter of machine tool in half a day. The software can automatically write compensation tables and upload them to the m

positive displacement meter|vortex flow meter

achines controller. For many years, the body diagonal displacement method (BDDM) defined in ASME B5.54 or ISO 230-6 standards has provided a fast method for detecting spatial errors for many manufacturers, such as aerospace companies like Boeing. BDDM measures the four diagonals of the machine tool workspace and generates four sets of data including all errors. However, sufficient data cannot yet be provided to identify the location of the error. Our new method - Stepwise Diagonal Measurement Method (SSDMM), also uses four diagonal lines and can collect 12 sets of data. Based on these data, three displacement errors, six straightness errors, and three perpendicularity errors can be measured without extending the downtime. In addition, the measured positioning error can be used to generate a spatial compensation table. Figure 2 shows the process of step-by-step diagonal measurement of spatial error within 2 hours, without the need to open the machine cover. SSDMM is different from BDDM in that its x, y, and z axes move sequentially and collect diagonal positioning errors, providing three times the amount of data and enabling the measurement of positioning errors for each axis movement. The trajectory of the target being measured is not a straight line, and its lateral movement is significant. Conventional interferometers cannot perform these measurements because such large lateral movements are not allowed. Single aperture laser interferometers such as Laser Doppler Displacement Meters are not affected by large lateral movements. Using a flat mirror as the target to be measured, movement parallel to the mirror will not transfer the laser beam, nor will it change the distance from the light source. Predictive Maintenance (

positive displacement meter|sdnand sdnand|vortex flow meter

1. Talk about the calibration of CNC machine tools

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