Particular attention must be paid when dimensioning is being accomplished via computeraided drafting CAD operations. One must be watchful to see that the program does not produce dimensions that are inappropriate for construction work. For example, the automatic dimensioning in CAD may yield dimensions like 7'5 13/16. Rarely does architectural work utilize such tight' or finite dimensioning; most construction work does not have to meet such fine tolerances.
Here, it is necessary to apply human determination to avoid impropriety in dimensions.
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Often, one or more dimensions in a line of di- 192 CHAPTER 18 – DIMENSIONS, NOTES AND TITLES CHAPTER 18 – DIMENSIONS, NOTES AND TITLES 193 mensions can be noted with a ± for example, 1′-4 1/± to indicate that a slight variance is permitted, either less or more the number shown. For the most part, this will not adversely affect the project, as the variations are virtually undetectable in the overall project work.
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