![]() ![]() When taking the center of the component as the origin, the two datum points are required to be symmetrical (as shown in Figure 10). It is necessary to place local reference points for wing pin packaging devices with pin spacing less than or equal to 0.4mm and face array packaging devices with pin spacing less than or equal to 0.8mm. If the four edges cannot be satisfied, the transmission edge must at least meet the requirements. The distance between the center of the reference point and the edge of the plate must be greater than 6.0 mm. The number of datum points is 3, which is distributed in the shape of āLā on the edge of the plate, and the distance between the datum points is as far as possible. When mirror symmetry is used, the reference points on the auxiliary side need to meet the requirement of overlap after flipping. A datum is a theoretically perfect feature. See Figure 9 for the location requirements of the reference point. A datum is a reference point for measurements. It is distributed in the shape of āLā on the edge of the plate. any level surface, line, or point used as a reference in measuring elevations. Note if your casting datum reference frame is not strictly datum target points, then be careful what alignment you use. ![]() 3 points determine the primary datum, 2 points determine the secondary and 1 point determines the tertiary datum. the object of knowledge as presented to the mind.Compare ideatum. If only datum target points are used, then something like a 3-2-1 arrangement happens. There are three reference points for plate making and three for unit. any proposition assumed or given, from which conclusions may be drawn. The following images show the Datum Point dialog box with a selected vertex (left. The new Project option can be used to project a datum point onto a planar surface, datum plane, or line. Starting with Creo Parametric 5.0.2.0, a new constraint option is available to define a datum point feature. Analysis/Measure/Angle from the XZ plane will give you the theta dimension. Make-up needs to place make-up reference point and unit reference point. Select the desired datum point creation tool. Create a Datum Point at the origin of the CSYS, then a Datum Axis through the Point, normal to the XY plane, then a Datum Plane through the Axis and through the Point you are trying to measure. ![]()
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