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大型零件直径尺寸的测量是当今国内外尚未得到很好解决的技术关键。本文主要介绍作者设计研制的大直径数显测量装置系统，并提出了新的测量原理和方法，经鉴定验证，该装置的测量精度可以满足大直径零件ＩＴ６精度等级的加工要求，保证了产品质量．
The measurement of the diameter of large parts is a key technology that has not been well solved in the world today. This article mainly introduces the large-diameter digital display measuring device system designed by the author, and puts forward the new measuring principle and method. After the verification, the measuring accuracy of the device can meet the processing requirements of the IT6 accuracy grade of the large-diameter part and ensure the product quality .