Chat with AIExam 23: Metric System Dimensioning and Iso Symbols
Discuss why the International Organization for Standardization recommends the use of projection symbols.
(37) 
VerifiedThe International Organization for Standardization (ISO) recommends the use of a projection symbol on drawings that are produced in one country for use among many countries. The projection symbols are intended to promote the accurate exchange of technical information through drawings. The ISO projection symbol, the notation on tolerances, and information on whether metric and/or inch dimensions are used on the drawing should appear as notes either within the title block or adjacent to it.
Briefly describe the ANSI and ISO drafting standards.
(37) VerifiedTwo sets of drafting standards are accepted worldwide: ANSI (inch-metric) and ISO (metric). Almost all practices (dimensioning; line types and thicknesses; welding symbols; drawing sheet sizes; GD&T; screw threads; surface textures; finish symbols; etc.) are now the same in either system or roughly comparable. Most major technical differences are beyond the scope of this text. Of course, the most obvious difference between the two is that U.S. multi-view drawings use third-angle projection. Europe and Asia follow ISO practices and view objects from first-angle projection. ANSI recommends decimal-inch dimensioning and notes on U.S. drawings to be unidirectional. ISO default practice allows aligned decimal millimeter dimensions. Both standards are used throughout North America.
Explain why a part designer has the practice of rounding off dimensions to the nearest even decimal.
(35) VerifiedWhen dimensions on a drawing need to be divided, the part designer tries to round off the dimensions to the nearest even decimal. This practice permits parts to be economically machined to tolerances within a required number of decimal places.
Production costs are related directly to the ____ required to produce a part.
(35) ____ default practice allows aligned decimal millimeter dimensions. Both standards are used throughout North America.
(44) 
In the accompanying figure, the item identified as number 3 is a(n) ____.
In the accompanying figure, the item identified as number 3 is a(n) ____. (40) What are the two mathematical methods used to find equivalent dimensional values in other systems?
(41) ____ recommends decimal-inch dimensioning and notes on U.S. drawings to be unidirectional.
(39) Explain the practice for unilateral millimeter tolerancing on ISO metric drawings.
(32) 
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