Large-scale precision measurement is an unsolved problem in measurement technology. Although there are many methods and instruments for measuring large sizes, methods and apparatus suitable for measuring high-precision large-size in the production field are still rare. We have recently developed a precision magnetic grid measuring tool for large-scale measurement on the shop floor. It can directly measure some internal and external dimensions within 1m of the magnetic grid measuring scale, and can also be positioned by means of light collimation. Establish an auxiliary reference and measure the large size within 10m. If it is equipped with a bow bridge, it can be directly
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