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1.How to Choose an Optical Measurement Projector
The primary choice is between vertical and horizontal projectors. Choose a vertical projector (light path travels vertically) for flat parts like gaskets, O-rings, and stamped components, as parts are simply placed on a glass plate . A horizontal projector (light path travels horizontally) is better for large, heavy parts like shafts, castings, and machined components, which are typically held on V-blocks or between centers .
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2.What is the basic principle of a Rockwell hardness test?
The Rockwell hardness test measures a material's hardness based on the permanent depth of indentation under specific conditions. It uses a two-step load application: a minor (pre) load is applied first to set a reference point, followed by a major load. After removing the major load, the depth of the residual indentation is measured while the minor load is still applied. A shallower indentation depth indicates a higher hardness .
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3.How is the Rockwell hardness value calculated?
The hardness number is derived from the residual indentation depth (h). The general formula is HR = N - (h / S), where Nis a constant (typically 100 or 130), and Sis the scale unit (0.002 mm for regular Rockwell) . This means a smaller hresults in a higher hardness value.
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4.What are the most common types of length measurement tools?
The most common tools range from simple rulers for everyday use to precise instruments for engineering and quality control. Key types include precision hand tools like calipers and micrometers, large-scale measuring tools like tape measures, and advanced optical measurement systems.
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