5/19/2023 0 Comments Datum axisPrimary datum plane defined by three datum target areas (A1, A2, A3) In our case, these datum target areas are designated by A1, A2 and A3.įigure 1. Since we have a very large surface, the use of datum target areas instead of points for simulated datums is more precise. Select 3 positions for datum targets on the largest surface of the part, positioning them as far apart as possible for stability (Figure 1). The 3-2-1 location method is used to eliminate these degrees of freedom gradually by constraining the part to datum targets.ģ Datum Target Areas on the Primary Datum Plane The 3-2-1 location method is widely used to attain this goal.Ī free body has six degrees of freedom linear translations in the X, Y and Z axes, as well as rotational motion around each of the X, Y and Z axes, also referred to as pitch, yaw and roll. The aim of ideal location is to create an accurate and repeatable datum reference frame for the part while avoiding overconstraint. This post will present a possible case in the automotive industry for locating a car door with the 3-2-1 location method, using datum target areas.įor more detailed information on datum targets, you may refer to the ASME standard, section 4.24. In these cases, we use datum targets to establish a datum reference frame. For many automotive parts, because of the large and irregular surfaces involved, the entire surface of the feature cannot be used as a datum. ![]() In manufacturing and assembly, parts must be accurately and repeatably located in a well-defined reference frame to ensure consistent quality.
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