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一、美国Sheffield Measurement公司美国Sheffield Measureinent公司(简称SM公司)位于东北部的Dayton市,1982年以前称为Bendix Automation & Measurement Division,1983年改为SM,是一家量仪专业公司,有较大规模的生产能力。SM公司的主要产品是表面粗糙度检查仪,圆度仪、专用检验机和座标测量机。表面粗糙度检查仪有六个型号的产品,此外还根据工件的检测需要和用户的要求设计制造专用仪器。图1是7L型仪器,可检R_a值,
1. Sheffield Measureinent Inc. (referred to as SM Co., Ltd.) of the United States, Sheffield Measurement Co., Ltd. is located in Dayton City in the northeast. Previously known as Bendix Automation & Measurement Division in 1982, it was changed to SM in 1983. It is a professional measuring instrument company with large scale. The production capacity. SM’s main products are surface roughness testers, roundness meters, special inspection machines and coordinate measuring machines. The surface roughness tester has six types of products. In addition, special instruments are designed and manufactured according to the detection requirements of the workpiece and the requirements of the user. Figure 1 is a 7L type instrument that can detect R_a values,