![]() For another example, 30 mm on the drawing represents 50 × 30 mm = 1500 mm (or 1.5 metres) on the object.įigure 2 lists the scale ratios used for building plans and construction drawings in both metric and the approximate equivalent architectural scale ratios. It is graduated in millimeters (mm) and centimeters (cm) on one side and inches (in) and its fractions on the other. A printable 6-inch or 15 cm could be the solution. You might require a small scale of 6 inches length for your Math assignment but may not have a real one. This means that the object is 50 times as large as the drawing, so that 50 mm on the object is represented by 1 mm on the drawing. Printable 6-inch Ruler for Actual Size Measurements. For example, the standard metric scale ratio that corresponds approximately to ¼ " = 1 '-0 " is written on drawings as "Scale 1:50." Metric scale ratios use the same units in both ratio terms, resulting in an expression of how many times smaller than the object the drawing is. At the same scale, a line 1½ " long represents an object 6 ' long, because 1½ " contains 6 quarter-inches. This means that a line 1/4 " long on the drawing represents an object that is one foot long. The most common architect’s scale used is 1/4 inch to the foot, written on drawings as: The architect’s scales use ratios of inches to a foot. Thus the scale factor for this drawing is 1:24. And finally, rewrite the fraction as a ratio. Multiply both the numerator and denominator by 2 to simplify. ![]() For drawings smaller than the object, the ratio is that of a smaller distance to a larger one. Since the drawing is scaled down, then the scale factor should be reduced to a fraction with a numerator of 1. The scale is the ratio of the size of the drawing to the object. In the latter case, this will be indicated by the “not to scale” abbreviation (NTS). The scale of the drawing is always written on the drawing, unless the drawing is not drawn to scale. Architect's scale ruler Metric scale ruler The kinds of rulers we will be discussing for making scaled drawings are the architect’s scale and the metric scale, both shown in Figure 1. ![]() Reduction scales make the drawing smaller than the object. For the purposes of representation, we will only be concerned with reduction scales. The flexibility to draw proportionally in different sizes is provided by scales. It is large enough to provide the desired detail but small enough to be handy. The convenience comes from the size of the drawing. The most accurate way, after i measure the size of virtual ruler by an actual ruler, i found the markings are not very accurate at 30cm, so i adjust the default pixels per inch(PPI) to 100.7, now i get an online actual size ruler. The accuracy is achieved because the drawing is proportional to the real thing. Scale drawings are accurate and convenient visual representations made and used by engineers, architects, and people in the construction trades. Use scale rulers to determine actual dimensions from drawings
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