![]() In the bottom half of the datum target frame, you write the letter/symbol indicating the same datum as that of the entire feature, along with the number of the datum target. The default location of the Project Base Point is in the same place as Revit’s Origin (or 0,0,0). Specifying a Datum TargetĪ datum target is described using a circular frame with a horizontal line drawn through the middle (datum target frame). This will control the datum Revit uses to display the elevation of a Level. ![]() In such cases, you can indicate a datum target to define the minimum required part as a datum. Reduced level (RL) The RL of a point is its height above or below a reference datum. The most commonly used datum is that of mean sea level (MSL). Using a concaved bottom as a datum plane may also cause problems in placing it directly on the surface plate. Datum A datum is any reference surface to which the elevations of points are referred. Measuring under such conditions can result in deteriorated repeatability and reproducibility. ![]() 'One datum point on the number line had a value of five.' 'One data point on the graph represented the coordinates 2,4. So datum acts as a reference point or an anchor for almost all geometrical tolerances and dimensions. Heres a point (ahem) to consider: A point is not always defined by multiple datum such as the values of two or more axes. If a plane defined as a datum is warped or otherwise shaped inappropriately, using that entire surface as a datum feature for indication can cause a significant error during processing or inspection. What Is A Datum: Datum definition Datum is a theoretical exact plane, axis, or point that GD & T or geometrical tolerances use to reference dimensions. A datum target is a point, line, or limited zone on a target with which machines and instruments for processing, measuring, and inspection come into contact in order to establish a datum. ![]()
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