一、分析阅读New Rules for Dimensioningand Tolerancing DrawingsANSI standards for engineering drawingsare being changed for the first time since 1973.The new standards are an extensive departurefrom current practice, but in the long runare expected to cut costs by saving draftingtime, improving clarity, and increasing commo-nality with European practice.A new draft standard on dimensioning andtolerancing was circulated by the AmericanNational Standards Institute in 1980. This preli- An Analysis Read New Rules for Dimensioning and Tolerancing Drawings ANSI S for engineering drawings are being changed for the first time since 1973.The new standards are an extensive departurefrom current practice, but in the long runare expected to cut costs by saving draftingtime, improving clarity, and increasing commo-nality with European practice. A new draft standard on dimensioning and rotation was circulated by the American National Standards Institute in 1980. This preli-