Decimal Rulers have graduations or marks which are based on the decimal system such as 0.5, 0.25, 0.1, 0.05, etc. Fractional Rulers have graduations or marks based on fractions, for example 1/2', 1/4' 1/8', 1/16', etc. In this way 1/2 2/4 4/8 8/16 that plus 1/16 results in 9/16. How to Use a Fractional Ruler (Inches) There are two types of scales commonly used on rulers Fractional and Decimal. For an in-depth look at both engineering and architectural scales, check out this tutorial on CAD Scale Factors by ArchToolbox. It’s not possible to sum 1/2 with 1/16, except if we convert fractions to the same denominator. However, the length of a copy or print paper that you could use to draw this van is a little. Invert the fraction and multiply by 12 to get: 4/1 x 12 = 48įor calculating the scale factor from an engineering drawing scale, only multiply the feet by 12. In real-life, the length of this van may measure 240 inches.The simplest way to calculate the scale factor is by using these simple formulas.įor calculating scale factor out of architectural drawing scale: the mixed fraction, in blue, is the sum of the indicated fraction by the with the indicated fraction in the main scale, to the whole inch indicated in the main scale, after the simplification. In short, the scale factor is the relationship between our printed units and our drawing units. the fraction in black is the value read in the main scale, each mark is equal to 1/16 or 8/128 the integer in black represent the whole inches. Hence, we need to understand and implement the scale factors in order to adequately size dimensions, text, blocks and lines. When the drawings are printed for production, they’re represented much smaller than the y actually are. If you can’t resize basic values when you need to, your drawings can’t be as accurate as needed.Ĭalculating a scale factor in CAD is, thus, a simple, but important task. were larger than x-height fractions at large sizes, a phenomenon he termed optical scale. The latter two elements are what can make or break your drawing. Assuming a standard reading distance of 40 cm (16 inches). When working in AutoCAD, you’re not only working with objects and drawings, you’re also working with dimensions and measurements. Part 7 of 13 in our How To Use AutoCAD series
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